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PGA309EVM User`s Guide (Rev. D

1. ga 1 O e scL p O 6 spA SDA tS O SCL a F11 e GND Miscellaneous Breadboard Area 24d O e Test F12 C11 cg 1SMA5913BT3 400pF F13 e PRG Q 1uF l P 6 2V O 71 AGND Rar LI Vs oD e Vout C10 L J e F14 2 Jtest C2 104F lt eee S 8 0 01uF Q T aod 2 v Olu u 8 Vs Int F103 Vexc C1 ma N Tio e or 552 dl QOiuF 300 e 9 REF Bridge Vs 4 a g 10 3 16 x ibd l m o m Vso Va REF T bs AEN a ale 14 spa BUT PRG i 1 13 1 Test e SCL vee 400pF SCL u1 PRG 2 J8 are Riso M J10 vss PGA309 LM jit eles Short L 9 9 Vin1 1 7 ME i Vbr 9 R3 c3 Vexc Vour n e AAA e hd Rte i r 1000pF
2. e Vs R15 Tio 0 01uF C20 V PC DIS 10k U7 Ptest 4 F1 i i mao eo o e e Vcc e Um v L8 UP Ea a2 en Ko E Dan OUT IN e e GN SDA F2 1 95 95 1 JE Voc ce gg 2 MNDUNE D3 NL 2 NC E mA SCL e U10 Utt 15 EEP 9 0 01uF ao 3 M LZ ZHC8500A Voc M EE E 1 2 5 6 4 ADJ NCLS C19 T Tpwr GND Fa 3 R6 4 5 10nF F9 o 6Vdc Test Oo pua SN74LVC1G66 E at 10kc Cii 3V R9 GND EN e B o 200mA Vs je o Lr e e vs 2 39 8 2 9 ZXMP3A17E6 150uF e 18 2k02 a dio s E PRG e a E8 oe D Case JA BD T inse nan i O S tul AGND A Elf Vs R14 5V 11 5kQ 4 x SN74LVC1G07 Vout cc AAA e Veg NPU e e 1PU ScL lt 2002 i U8 R3 JC SCL 7 Vouti j 3F3 47kQ 1 5 eus dn e e e Des LLL e Ut ooi e e e R1
3. Location To help services provide you with local information such as news and weather select your present location United States v Figure 55 Regional and Language Options pop up window Regional Options tab Step 8 Click on the Customize Tab in the Regional Options tab of the Regional Language Options pop up window as shown in Figure 56 Shortcut to Shortcut to PeoplePC Shortcut to Shortcut to Regional and Language Options Etui Regional ptions Languages Advanced Customize Regional Options Numbers Currency Time Positive 123 456 783 00 Negative i 23 455 783 00 Decimal symbol No of digits after decimal Digit grouping symbol Digit grouping 123 456 783 Negative sign symbol Negative number format Display leading zeros List separator Measurement system Metric Digit substitution DX igit substitution Shortcut EXCEL E Apply Figure 56 Customize Regional Options pop up window Burr Brown Products fram Taxas Instruments Page 56 of 62 Step 6 In the Customize Regional Options pop up window as shown in Figure 56 under the Decimal symbol option select from the drop down menu as shown in Figure 57 Click on OK in the Customize Regional Options window which will return you to the Regional and Language Options Window as shown
4. Coarse Front End and Output Amplifier Gains Temp ADC Configuration etc 2 The current configuration must be entered into the PGA309 Calibration spreadsheet To do this perform the following actions A Open the PGA309 Calibration Spreadsheet click Enable Macros if asked Upon opening you will be asked if you would like to open the PGASO9EVM Board Control Program Answer Yes If you already have the software running a new window will not be open but a data link will be established B Make sure the current PGA309 register values are displayed in the Board Control Program click Head PGA309 button see Figure 38 7 Wribke Au PA 3S PGA Settings Innu Referred Offset rl Ta aaa Figure 38 Board Control Software Main Window Read PGA Button Write EEPROM C Return to the Main Worksheet and click Load Registers from Bench The register values in the cells B3 B12 will be updated The values of the gain offset and other parameters are set on the next worksheet accordingly to the PGA309 register configuration D Click Prepare Calibration Sheet The dialog box in Figure 39 will appear Select the appropriate algorithm The script will copy the right template to the Sensor Curvefit Worksheet and open the next page E Select the appropriate Temperature Calibration Method see Figure 40 Burr Brown Products fram Taxas Instruments Page 44 of 62 PGA309 Calibration Please sele
5. D qu j d e e Top Row Reset Open File Save File Detect J Control Buttons 3 PRG pin shorted to Vout PGA309 Test Pin HIGH EE eeban rg PGA309 Registers l 4 096 we Click on the register to edit the value and see the details Sane PRA Dain KAJ 64000 vij A e NE Zero DAC M oao Detect External Faults ADC Outi RO 0x016 0x0000_0001_1000_0110 Gain DAC vh 999 990m i Detect Internal Saturatiarr ZeroDAC x 640 0x0000_0110_0100_0000 Suivi cure Bein A Vout high on external fault GainDAC OxFFFF 0x1111 1111 1111 1111 l 2 400 i Wout high on internal Fault Ref amp L in Ox0500 Enable Over Under Scale Limits rJ PGA3DS Temo ADC Gain Vos Cgi 0x1611 0x0001_0110_0001_0001 Overscale Limit ase Deal Cfg OverUnder Ox0A47 a TTSETTT Underscale Limit 547 898m les dsl 14 OutEnbl Counter 0x0000 x0000 0000 0000 0000 Enable Sensor Excitation AlarmStatus RO 0x0000 0x0000 0000 0000 0000 Config Checksum 0x705B 0x0111 0000 0101 1011 Lookup Table 0300 0640 FFFF Display Mode 7FFF gogg 71C1 Binary r Interface Board and AD51100 I I jp supply Yoo V 5 0 I Hex Volt 073257 Decimal i j Dec 4801 Ea I I I I Hex 11201 EN Ou Update Vout Settings PGA Interface Two Wwire 6C keep comm alive Instant Update Show 1k Bit Autocale Chksum w Jew g EEPROM l j Update COM Port l Checksums Setup EEPROM Lookup Table Bitmap of a regis
6. 9 3 Spreadsheet Overview The PGAS309EVM Calibration Spreadsheet contains the following parts 1 The Main Worksheet is shown in Figure 34 It contains the current values of the PGA309 register table the lookup table and the control buttons The buttons have the following functions A Load Registers From File Read register values from a text file saved by PGA309EVM Board Control Program B Load Registers From PGA309 Read configuration register values directly from the PGA309EVM Board Control Program must be currently running Using A or B will update the gain offset and reference values used for calibration C Prepare Calibration Sheet Prepare the Worksheet Sensor Curvefit for calibration using one of the three templates described in Section 9 1 and start entering calibration measurements D Save Registers Lookup Table After the calibration has been completed you have to return to this Worksheet and save the resulting configuration register values and the Lookup Table to a text file The file can be later read by the PGA309 Board Control Program and written into EEPROM on the PGA309 Sensor Interface Board E Microsoft Excel PGA309 Calibration xls File Edit View Insert Format Tools Data Window Help 0x D c ES el v 4mm amp r 2 Me 7 Ara 0 BruiEie A 2 fa Pa Ta v Ye Reply with Changes N G26 Y fe A B C D E F H el 1 PGA309 Configuration Registers PGA309 Calib
7. Printers and Faxes Y Paint ESP 2 9 Help and Support Shortcut to POWERPNT EXE po Search All Programs D ec amp Control Panel File Edit View Favorites Tools Help Q wi O Search Folders gt E x ic Fei E y f Address Control Panel Mame Comments Game Controllers Add remove and configure game controller hardware such as joysticks and gamepads E d HCL Inetd HCL Inetd VA Intel R Extreme Graphics Control the graphics hardware Features of your system P Internet Options Configure your Internet display and connection settings Sy Keyboard Customize your keyboard settings such as the cursor blink rate and the character repeat rate EB mail Microsoft Outlook Profiles D Mouse Customize your mouse settings such as the button configuration double click speed mouse pointers and motion speed BilnetDeploy Launcher Changes settings For the netDeploy Launcher Network Connections Connects to other computers networks and the Internet ls Phone and Modem Options Configure your telephone dialing rules and modem settings Power Options Configure energy saving settings for your computer b Printers and Faxes Shows installed printers and Fax printers and helps you add new ones QuickTime Configures QuickTime software and hardware components lt Regional and Language Options Customize settings For the display of languages numbers times and dates Remote Control Configures remote control settings c Sy Scann
8. Read EEPROM Set PreCal EE 3 FPGA Settings PRG pin shorted to Vout PGA309 Test Pin HIGH reciia ti sam Enable nemali Te PGA309 Registers FrontEnd PGA Gain A eqo00 VieiValue 4096 7 Click on the register ta edit the value and see the details Fault Detection Zero DAC VJ 319 000m ess M ee Detect External Faults W ADC Out RO Bain DAC v NE 727 549m Detect Internal Saturation E ZeroDAC l Yout high on external Fault Ive GainDAC Output Amp Gain V v 5 ang Ref amp Lin Enable Over Under Scale Limits e PGA303 Temp ADC Gain Vos Cfg1 UM S 0 0 Deol 775 5 degC Cfg2 OverUnder Ox0000_1 th 50 0s Setup s Dec 12408 aje a p ane Hex 3078 h cat Wout high an internal Fault a Ux1603 s Kit CUTE ni Lew LEE HE HER dE MET TU Cfg3 ADC Ox0001_0 Convert 9 Designer The PC Interface Board appears to be connected Do you want to load the EEPROM and register contents into the PC memory Interface Board and ADS1100 supply Yoo vr 5 0 Yolk St 03540 Kg Hex 4DCF Board Update Vout Settings PGA Interface Twolwire C Keep comm aliwe Instant Update Show TkBit Autocale Chksum Ww ee EEPROM Update COM Port Checksums Setup EEPROM Lookup Table Bitmap of a register Detecting PGA308 board Please stand by Figure 11 Communication Pop up Window after COM Po
9. See Figure 19 Click on Calibrate the ADS1100 This will measure the offset on the ADS1100 and the Board Control Software will adjust all future readings to account for the offset Burr Brown Products from Tazas Instruments Page 49 of 62 10 1 PGA309DK Two Wire Interface and Long Leads Effect When using the PGA309DK with long leads between the PGA309 PC Interface Board and the PGA309 Sensor Interface Board for the Two Wire Interface SDA SCL while the PGA309 is operating in Stand Alone Mode and the Read ADS1100 Continuously function is enabled an error can occur as shown in Figure 45 0 0000 0000 0000 Enable Sensor Excitation e The ADS 1100 is not responding Read aborted EO moe UEM Figure 45 Read ADS1100 Continuously Error Message Cause amp Solution Long leads add capacitance and inductance to the SDA and SCL lines going into the PGA309 PC Interface Board Even though U10 and U11 on the PGA309 PC Interface Board were intended to isolate the PGA309 PC Interface Board Two Wire Interface from the PGA309 to EEPROM Two Wire Interface there is Capacitive feed through on falling edges of the PGA309 to EEPROM Two Wire Interface which couple into the PGA309 PC Interface Board Two Wire Interface used to communicate with the ADS1100 Since the Two Wire Interface does not use a low impedance pull up instead a 4 7kQ resistor these negative going transients are sufficient to inject random va
10. gt 0 6667 V V ExtraGain Pmax Kexc VN ZeroDAC1 hex gt gt 2 5000 V ExtraOffset FrontEnd PGA VN 11 Temp range Output Amp VN Temperature ADC Settings Used For Rt Calc Only 12 Tmin Coarse Offset V Rt Leave this cell blank Rt is not used in this configuration 13 Tmax No of Bits 14 Troom Vexc 5 000 V with LinDAC 0 AdcGain 18 Adc Vier Bridge sensitivity Insert TempADC reading in active cell Insert Vout reading in active cell 16 2 0E 01 17 Measurement Temperatures TempADC Reading Tmeas 18 Tmeas1 room decimal this Temp 3 pressure levels are applied 19 Tmeas2 hot decimal 1 5E 01 20 Tmeas3 cold 21 8 22 Post First Cal Correction 1 0E 01 23 Measurement Conditions RTISpan V V Meas Data 9 24 Tem Pressure VoutMeas RTI Kbrg v v Pressure VoutMeas 25 20 0 1 06E 01 s 9 0E 02 26 20 50 3 13E 02 E z 20 100 4 38E 02 0 0E 00 29 85 i 0 1 06E 01 z 30 85 100 4 38E 02 5 0E 02 31 z 32 40 0 1 06E 01 m 33 40 r 100 4 38E 02 X 4 0F 01 34 Room Temp Gain Error 1 PGA Min Output Room 35 Room Temp Cor Gain Dac 1 PGA Max Output Roorr 36 Post Cal RTI Kbrg Pin min 0 53125 GainDAC Correction 1 1 5E 01 zr Post Cal RTI Kbrg Pin max 0 21875 ZeroDAC Correction 0 T d 38 Set Pressure 0 and measurements at 3 temperatures CUR 39 Matrix ResultVector1 Solution coefs vals 40 1 85 7225 1 06E 01 41 r 20 400 1 06E 01 ko1 0 000E 00 Kbridge vs pressua M 4 MN Main X Sensor Curv
11. DAC VY 999 990m Detect Internal Saturation E zeroDAT Ox0000 0110 0100 0000 F o t1u uud Stm Puce E awe out high on external fault rJ Cain 0x1111 1111 1111 1111 Vout high on internal fault E Ref amp i OxO000 0104 nooo ooo 3 imits in x il l B Enable eius pelas v PGA3US Temp ADC Gain Vos Cigi 0x000 01700001 O00 verscale Lim 3 976 Degc D6 4375 degC Cig OverUnder OxO000 1010 0100 0114 VEM Underscale Limit Cfg3 ADC DxDOD1 0110 0000 DO1 247 808m gt Dec OutEnbl Counter Ox0000 0000 0000 0000 Enable Sensor Excitation iv H 1AT I a eve E ADC Config AlarmStatus RO Ox 0000 0000 nona 0000 3 400 Convert Config Checksum x7056 0x0111_0000_0101_1011 Linearization Coet v Avy 0 000 Register Bitmap Interface Board and ADS1100 RFE RFE ADC 2X ADCS ISEN CEM TEM AREN 0 o jo 1 jo a 1 o Fe read Supply vec Y 5 0 RY RYD Mi Ma G1 on R1 volt RO e p e P PR B B Pma ce p m FB Reserved Factory Bit Set ta zero for proper operation Hex 5T75 FE Reserved Factory Bit Set ta zero for proper operation Board DC2X Temp ADC turbo modetnot for internal Temp Sense Made O 1 speed ams typical 122X speed 3ms Update Vout Settings v pica DCS Start restart the Temperature ADC one shot if CEN 07 O No Starti amp estart 1 Start Restart SEM 7uA ITEMP Current source on pin TEMPin Enable 1 Enable O Dizable Keep comm alive PGA Interface EM Continuous co
12. Ingtrumants Page 2 7 of 62 Look in E P303 Designer s Kit git Ez E PGA309 DK Test Ext File name A My Network Files of type Test tut Cancel Places Open as read only Figure 18 Typical Write PGA309 or Read PGA309 Pop up Window 7 2 EEPROM Lookup Table When the EEPROM Lookup Table is selected on the bottom Tab in the Main Window the Temperature Coefficients stored in the PGA309 external EEPROM from the last Read EEPROM are displayed in the Lookup Table section of the Main Window These values can be displayed by selecting the desired format as Binary Hex or Decimal under Display Mode in the Lookup Table section See Figure 17 If the entire contents of the EEPROM is to be viewed or edited in Hex and ASCII only then click on Show 1kBit EEPROM in the Lookup Table section of the Main Window Figure 16 shows the resultant pop up window which displays the entire external PGA309 EEPROM contents in Hex Remember the EEPROM contents are mapped least significant byte first relative to PGA309 16 Bit registers as shown in Figure 20 PGA309 Board 1 KBit EEPROM Content XE Addr Hex ASCII O he 5400 00 00 00 00 05 D Tt 16 47 0A 03 16 5B 70 00 08 40 06 FF FF FF TF 5 00 00 C1 71 FF FF FF FF CSE ata ij FF FF FF FF FF FF FF FF 4g FF FF FF FF FF FF FF FF Read EEPROM Ec FF FF FF FF FF FF FF FF E4 FF FF FF FF FF FF FF FF 120 FF FF FF FF FF FF FF FF Fi
13. Temp ADC Configuration amp Readback Burr Brown Products fram Taxes Instruments Page 31 of 62 7 7 Interface Board and ADS1100 In the Interface Board and ADS1100 section in the Main Window click on Board Settings A pop up window will appear as in Figure 23 This pop up window provides configuration control of the ADS1100 and the Port Expander PCF8574A AD Cure Lenta mynnnn nnn 1n1n ni11 m 49 TI PGA309 Interface Board ADS1100 and PCFB574A 3e x F Output oltage Ref Set Volt 0 21332 Vs Single Shot Calibrate ADS1100 Read ADS1100 m c Read ADS1100 Gen Call Reset Decimal 1398 Continuously GencalReset ADS Output Register DiS Di4 DIS Di Dii Did D9 D Di jo go gogo fo fr fo fr fo fr fr fr fo ft fr fo MZE LSB ADS1100 Configuration Status Register EVM PCF3574A Test nLED2 a aver Tien OS DE pin nLED1 Cal n Sen rr fo fo fo fr fr fo fo fo 1 o o fs o fo 1 MSB LSH MSB LSH Autacal Figure 23 ADS1100 and PCF8574A Status Window In the pop up window the bits under EVM PCF8574A will toggle when single clicked Table 6 describes the use of each of these bits If the Calibrate ADS1100 Button is pushed it will short the two inputs of the ADS1100 together and compute the offset error All ADS1100 readings which follow will be calibrated to account for this offset error In addition measure the voltage Vs on the PGAS309 PC Interface Board with an accurate meter and enter this voltag
14. To allow reliable uninterrupted connection to the PGA309 Sensor Interface Board ADS1100 and PCF8574A when PGA309 is in otand Alone Mode set this bit to zero P6 nLED2 4 NO x 1 Enables the Two Wire interface from To allow for Two Wire digital communication the PGA309 Sensor Interface Board from PC to PGA309 and external EEPROM Applies Vs to PGA309 Sensor Important when PRG is connected to Vout on Interface Board PGA309 to ensure One Wire communication during power up P1 nVSen 1 Removes Vs from PGA309 Sensor Important when PRG is connected to Vout on Interface Board PGA309 to ensure One Wire communication during power up PO Important to disable for unloaded PGA309 1Wen resistor Vout accurate reading through ADS1100 eso ef resistor Table 6 Functionality of Port Expander PCF8574A Bits default initial values selected by the Board Control Software are highlighted in bold Burr Brown Products fram Taxes Instruments Page 33 of 62 7 8 Interface The Interface section in the Main Window allows for selection of One Wire or Two Wire digital communication with the PGA309 Sensor Interface Board Refer to Figure 24 A single click in the respective circle will select the desired interface All Board Control Software functionality is supported over either of these interfaces however the One Wire interface is the preferred one due to potential conflicts arising from two Two Wire masters PC and PGA309 sharing the bu
15. are used as diagnostic LEDs Q1 also controlled through U5 provides a mechanism to turn power on and off to the PGA309 Sensor Interface Board by the Board Control Software This is key when PRG is connected to Vout on the PGA309 since Vout is set to high impedance on power up for 25ms to allow for One Wire communication An unused port P3 pin 7 is available for customer use with control provided in the Board Control Software The One Wire pull up resistor R3 can be disabled through U5 to remove loading from the PGA309 Vout pin for an accurate readout through the ADS1100 U3 U5 also controls the zero calibration of the ADS1100 The Two Wire interface can be isolated from the PGA309 Sensor Interface Board by software through U5 control of U10 and U11 or also by hardware jumper programming 4 3 One Wire Digital Interface On this Designer s Kit the One Wire digital interface is the preferred mode of communication with PGA309 It is provided through the conversion of RS 232 UART signals from U9 into open drain output through U2 The resistive pull up for the One Wire interface is enabled or disabled through U1 The One Wire pull up can be disabled for an accurate PGA309 Vout reading without the extra loading due to R3 JC provides a selection for the One Wire active pull up 1PU or no One Wire active pull up 1NPU This feature is described in detail in Section 5 1 Jumper JB provides a mechanism for communication through Vout when PRG is tied to Vout
16. clamp to keep the input of U12 inside its allowed input voltage range for reliable operation Figure 2 illustrates the One Wire Pull Up into a non capacitive load The table shows typical values for a supply voltage of 3 0V Burr Brown Products fram Taxas Instruments Page 9 of 62 Tek SEH Single Seq 10MS s i T Chi RMS 2 115V Save Currant Farmat Typical 2 63V 122mV Figure 2 One Wire Active Pull Up Waveform and Typical Levels Vs 3V 5 2 Vs Quick Discharge It is desired at times to cycle the power on the PGA309 to be able to communicate through PRG when it is tied to Vout while Vout is set to high impedance by the PGA309 on initial power up The supply voltage on the PGA309 must decay to near zero to ensure that on power up the state of the PGA309 is set correctly With a 10uF capacitor on Vs on the PGA309 PC Interface Board and another 10uF capacitor on Vs on the PGA309 Sensor Interface Board reliable reset operation is guaranteed by discharging these capacitors through U15 and R25 Whenever Q1 see Sheet 1 of 2 PGA309 PC Interface Board Schematic is off and disconnects power from Vs then U15 is on for quick discharge of Vs And whenever Q1 is on then U15 is off Burr Brown Products from Texas lnetrumanty Page 10 of 62
17. eeeeeeee8 TIAE 69999797999 0990999099 ooee000 o090000 o00000 ooooooo oooooo oo0oo0o0o0 ooo op oooo0oo0oo0coo0od ooo0oo0o00000 Pln ful I e OoOOOOOOOOO0OOO0O0O0Oo0Oo0Oo00o000000 COMPLETE EVALUATION TOOL FOR PGA309 e PGA309 Hardware Designer s Kit o Evaluate PGA309 User s Sensor o Full Temperature Evaluation e Software Control for Designer s Kit o Program PGA309 for Evaluation o Program PGA309 User s Sensor in Final Module o Computation Analysis Tool for Calibration of PGA309 Sensor Burr Brown Products fram Taxas Instruments Page 1 of 62 Table of Contents 1 0 PGA309EVM Parts List 2 0 Description 3 0 PGA309 Sensor Interface Board Overview 4 0 PGA309 PC Interface Board Overview Part 1 5 0 PGA309 PC Interface Board Overview Part 2 PGA309 Sensor Interface Board Schematic PGA309 PC Interface Board Schematic Page 1 of 2 PGA309 PC Interface Board Schematic Page 2 of 2 6 0 Initial Setup and Checkout 7 0 Board Control Software Overview 8 0 PGA308 Calculator Software for Gain Offset Calculation and Simulation 9 0 PGA309 Sensor Calibration Spreadsheet for Microsoft Excel 10 0 General Operating Tips 11 0 PGA309EVM PC Cable Drawing 12 0 PGA309EVM External EEPROM Settings for Functional Test Note PGA309 Documentation Availability Pages 3 5 5 6 LLL 67 a 7 8 8 10 11 LLL Y a 14 26 26 35 36 39 38 48 47 57 58 59 Please read and familiarize yourself
18. hardware pull up on the PGA309 PC Interface Board for reliable logic level transitions 3 Upon initial receipt of the PGA309EVM first perform the Initial Setup and Checkout as described in Section 6 0 If there is ever a doubt as to proper functioning of the PGASO9EVM return to this configuration and use Section 6 0 to verify proper operation Next configure the PGA309 Sensor Interface Board with your Sensor for evaluation Connect the PGA309 Sensor Interface Board to the PGA309 PC Interface Board using wire to connect the required signals together If all tests pass then move the PGA309 Sensor Interface Board into the temperature chamber for PGA309 Sensor calibration 4 When Reading and Writing to the PGA309 through the Board Interface Software push the desired button in the Main Window ONE TIME and wait until the Board Communication Status returns to Board Communication Idle before pushing any button Repeated pushing of buttons when the Board Software is in the middle of communication with the PGA309 will cause unreliable data transfer and nuisance errors 5 The most quiet analog readings with a voltmeter or oscilloscope on Vout of the PGA309 are accomplished when there is no digital activity from the test PC to the PGA309 PC Interface Board and the PGA309 Two Wire Bus is isolated from the PGA309 PC Interface Board The RS 232 interface chip U9 MAX3238 on the PGA309 PC Interface Board has a shutdown feature which disables the on b
19. high an internal Fault Ref amp Lin Ox0000 Ox0000_0000_0000_0000 Enable OverUnder Scale Limits PGA3DS Temp ADC Gain Vos Cfol 0x0000 0x0000_0000_0000_0000 Overscale Limit Dest Cfg2 OverUnder 0x0000 0x0000_0000_0000_0000 USER ET NN Dec Cfg3 ADC Ox0000_ 0000 0000 0000 QutEnbl Counter E i gt 8 Hex e etree ADC Confi AlarmStatus RO PGA309 Designer s Kit X onfig Config Checksum Convert 9 ThePC Interface Board appears to be connected ep Do you want to load the EEPROM and register contents into the PC memory Lookup Table Interface Board and ADS1100 7FFF 0000 000 Yes Mo supple Vcc v 5 0 Dec Hex Board u e Vout Settings PGA Interface Two wire CO Decimal C Keep comm alive Instant Update Aa cy Show TkBit Autocale Chksum vw One Wire EEPROM Checksums es EEPROM Lookup Table Bitmap of a register Detecting PGA309 board Please stand by Figure 7 Software Startup Main Window and First Pop up Window Burr Brown Products fram Taxas Instruments Page 18 of 62 The First Pop Up Window will disappear and the Main Window should look as in Figure 8 If it does then proceed to Section 6 5 4 and skip Section 6 5 3 Texas Instruments PGA309 Designer s Kit Control Program File Edit Board Setup E Reset Open File PRG pin shorted to Vout PGA309 Registers Save File Write PGA309 Read PGA309 PGA309 Test Pin HIGH Click on the re
20. on the PGA309 for a 3 terminal sensor module configuration Burr Brown Products fram Taxas Instruments Page 8 of 62 4 4 Two Wire Digital Interface Two Wire digital interface is provided through the conversion of RS 232 signals from U9 into open drain outputs with pull ups SDAoyr through U6 and SCLour through U8 SDA n is tied direct to U9 which is looking for 0 8V for a logic low and gt 2 0V 3V supply or gt 2 4V 5V supply for a logic high U10 and U11 provide a mechanism through software or hardware JE to separate the Two Wire bus interface from the PGA309 if it is physically connected If the PGA309 is in stand alone mode it will be routinely accessing its external EEPROM via the Two Wire interface as a master By disconnecting from the PGA309 Two Wire connections dedicated local Two Wire transactions on the PGA309 PC Interface Board such as reading the ADS1100 U3 can be conducted reliably and without interruption Note It is recommended to keep One Wire interface on the PGA309 PC Interface Board connected to the PGA309 Sensor Interface Board even when using Two Wire communication mode to the PGA309 and EEPROM from the PGA309EVM Board Software See Section 7 8 for details 4 5 ADS1100 On Board A D Converter The ADS1100 is a 16 Bit A D available to measure Vout from the PGA309 The ADS1100 is configurable through the Board Control Software U4 provides a means of measuring the ADS1100 initial offset for improved accuracy in its
21. patents or services described herein Please read the PGA309EVM User s Manual and PGA309 Data Sheet and specifically the Warnings and Restrictions notices in the Manual and Data Sheet prior to handling the product This notice contains important safety information about temperatures and voltages For further safety concerns please contact the Tl application engineer Persons handling the product must have electronics training and observe good laboratory practice standards No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products or services might be or are used Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright O 2004 Texas Instruments Incorporated Burr Brown Products from Texas Instrumonts Page 61 of 62 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to Tl s terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its hardware products to
22. readings 4 6 Test Points and Miscellaneous Breadboard Area There are several Test Points including a 3 position one for GND provided for ease of measuring analog signals Also provided are reserved areas with plated through standard spacing 0 1 holes for miscellaneous proof of concept breadboarding as desired for a given application 5 0 PGA309 PC Interface Board Overview Part 2 Refer to PGA309EVM PC Interface Board Schematic Sheet 2 of 2 5 1 One Wire Active Pull Up The One Wire Active Pull Up circuitry is intended to provide a fast rising edge pull up when the One Wire interface is connected to heavy capacitive loads such as when PRG is tied to Vout on the PGA309 and there is a 10nF capacitor on Vout to GND In this configuration there is an extremely long rise time due to a 4 7kO pull up on the One Wire interface One Shot U14 is rising edge triggered only non retriggerable Comparator U12 looks for a rising edge to transition above 0 7V The One Shot U14 then triggers and produces a 5uS wide pulse which controls switch U13 When switch U13 is turned on a 2000 pull up to Vs is provided on the One Wire Interface At the end of the 5uS pulse the 2000 pull up to Vsis removed The 5uS was chosen to provide a near symmetrical rise and fall time into a 10nF load on the One Wire interface RT is a provisional potentiometer which can be added to change the time the active pull up is applied to the One Wire Interface D5 D6 and R22 proved a
23. system setting enables non Unicode programs to display menus and dialogs in their native language It does not affect Unicode programs but it does apply to all users of this computer Select a language to match the language version of the non Unicode programs you want to use English United States v Code page conversion tables Change Regional Options v 10000 MAC Roman v 10001 MAC Japanese 9 You must restart your computer before the new settings will take effect La v 10002 MAC Traditional Chi v 10003 MAC Korean Do you want to restart your computer now 10004 MAC Arabic 10005 MAC Hebrew Default user account settings Apply all settings to the current user account and to the default user profile fa Figure 54 Restart Computer Burr Brown Products fram Taxas Instruments Page 55 of 62 Step 7 In the Regional and Language Options pop up window click on the Regional Options tab as shown in Figure 55 Regional and Language Options Regional Options Languages Advanced Standards and formats This option affects how some programs format numbers currencies dates and time Select an item to match its preferences or click Customize to choose your own formats Polish v Samples Number 123 456 789 00 Currency 123 456 789 00 zt Time 16 08 31 Short date 2004 06 21 Long date 21 czerwca 2004
24. will be used for this test On the PGA309 PC Interface Board the ADS1100 ADC will be used for this test Table 4 below details the actions and acceptable results for a pass condition of the PGA309 Sensor Interface and PGA309 PC Interface Boards Position Volts min Volts max BEI c IBN until audible clicking is heard 9 4 1 Rotate Fully Vexc 3 Counter Clockwise until audible clicking is heard 2 Replace J4 Table 4 Hardware Checkout Voltages and Settings Burr Brown Products fram Taxas Instruments Page 25 of 62 8 In the Main Window under PGA309 Temp ADC click on Convert see Figure 16 9 Temperature reading in C should be the PGA309 ambient 2 C Readout will be in Main Window under PGA309 Temp ADC section as shown in Figure 16 Pi 308 Temp ADT Degc 23 125 degC Dec 3T06 H 1721 ex Tie Convert Figure 16 Internal Temperature Reading If all steps above in Section 6 have been successfully completed then the PGA309 Sensor Interface Board PGA309 PC Interface Board PC Cable PGA309EVM Board Control Software are all operating correctly 7 0 Board Control Software Overview Figure 17 depicts the Main Window for the Board Control Software Subsections of the Main Window outlined by dashed lines as well as the Top Row Control Buttons and Board Communication Status will be described in detail in sections 7 1 7 10 48 Texas Instruments PGA309 Designer s Kit Control Program
25. with the PGA309 Data Sheet and PGA309 User s Guide prior to using the PGA309EVM Designers Kit since the PGA309 features and modes are not described herein Refer to Texas Instruments Website for latest revision of PGA309 Data Sheet and PGA309 User s Guide http focus ti com docs prod folders print pga309 html PGAS309EVM User s Guide and PGA309EVM Software http focus ti com docs toolsw folders print pga309evm us html http focus ti com docs toolsw folders print pga309evm eu html Burr Brown Products from Texas Ingtrumants 1 0 PGA309EVM Parts List PGA309EVM US amp PGA309EVM EU PGA309 PC Interface Board PGA309 Sensor Interface Board PC Cable 8 position RJ45 Plug to 9 position female DB9 AC Wall Adapter PGA309EVM US Only USA amp Canada Shipments Only 120Vac RMS 60Hz in eVdc 200mA out PGA309EVM Software CDROM Rev 1 1 2 or newer PGA309 Designer s Kit Board Control Software PGA309 Calibration Spreadsheet for Microsoft Excel PGASO9EVM User s Manual 1 1 PGA309 Designer s Kit Board Control Software Operating System Compatibility The Board Control Software runs on Win98 Win2000 and WinXP Also the regional settings should be set to English United States with the decimal symbol set to a period More information on issues related to changing regional settings is given in section 10 3 Consult factory for other operating systems 1 2 PGA309 Calibration Spreadsheet for Microsoft Excel Opera
26. 09 internal registers will automatically be updated Remember if you do not want the register settings in the PGA309 to be over written by valid PGA309 external EEPROM data then ensure the PGA309 Test pin is set high by checking the PGA309 Test Pin HIGH box in the upper left area of the Main Window 7 6 PGA309 Temp ADC In the PGA309 Temp ADC section of the Main Window the current Temp ADC reading will be displayed if the Convert button is pushed If a continuous update of the Temp ADC contents is desired it can be read and updated about every 0 75 second by checking the box labeled Keep Comm Alive in the lower right corner of the Main Window Please note that this will also prevent the 1s timeout in the PGA309 from expiring thus stopping EEPROM read back updates even if Test Pin is low By clicking on the ADC Config button a pop up window will be displayed as shown in Figure 22 The flexible Temp ADC can be configured as desired for the application For details of the Temp ADC options and settings see the PGA309 Data Sheet If the settings are changed and to be applied then click OK in the pop up window Remember if you do not want the register settings in the PGA309 to be over written by valid PGA309 external EEPROM data then ensure the PGA309 Test pin is set high by checking the PGA309 Test Pin HIGH box in the upper left area of the Main Window If these changes are to be included in the EEPROM then set the Test pin HIGH while c
27. 1 3 i Eon d E a SDA 4 7K cc OUT z e AI C15 NE 6 SDA SDA B R17 2 3 0 01 MF gut 2002 SN74LVC1G66 4 i l L V SN74LVC1G07 1206 cg oct 0 01uF 2 PE Ns Oo li 3 M SDAN o U2 R2 22 2 Vec NC 2000 iW Z OUT oO 3 PRG He NC Win Ys i R16 e JB e PRG V 4 7kQ e T L1 C5 4 NAA Vout n 150uH 6 1 uF e vy L c9 L 1 0 01pF ADS1100 0 1pF 6 e xL 047 bd Vs Vop 5 lOuF ca i2 A case L Vine goli Voc M 15uF _ 3 Texas Instruments C6 spal T C7 0 224F o3 U3 e I Instruments 4 MAX3238 ud GND 2 0 1UF PCF8574A V 6 v 16 Voc PO 4 r 4 ANN ideel p5 Lob g DX R1 e spa P2 DOUT DINI 20082 AAO ys P3 5 OP3 Vec SAL US PA 13 Pott lt pour2 co 1 5 4 e16 L aB P NISUS Ol U4 4 0 01uF 1kQ I JD 3 p MAN e lt DOUTA T gt Vec 3F10 DTR D D 3 Ppc d by RJ 45 F14 gt RINI D ko S 1kQ DTR s 4i 1206 206 CTS 9 8 AARI RS 232 Port D1 G D2 RD fe 9 DA LA RTS 6 7 EH e gt RINZ ROUT2 Logic IOs A gt 3 F15 Voc Vs TD B n 6 F12 sie UT DSR 9 B ees 40 gt RINI E ROUT3 e GND Eos D 12 Miscellaneous Breadboard Area D e PC Master Vog DOUTS x Serial Connection EE e ON 18 pma Data Out gt R13 ROUTIB EN Dataln lt 10kc2 z i 7 SDN PGA309 PC Interface Board Schematic 9 p 13 15 poe FORCEOH m aie Notes FORCEOFF r1 February 4 2004 Rev 9 0 1 All Data Signal Direction
28. 100 000 S Rt 0 lt Zero DAC Program Range lt 4 096 1 1 203 Rbridge 5 Voa3 4 9 1 000K Front 2782 LN r End Gain y 4 eon gt t 7 Gain DAC Vdif i 674 020m 020m 31 2 182m i Output Gain Vcos 2 0 33333 lt Gain DAC lt 1 0 2 400 1 282 1 Voal lt 4 88 r 2 lt Vin l lt 3 5 j Set Input to Full Scale Set Input to Zero and i E and Simulate Simulate Figure 33 Simulate PGA309 9 0 PGA309 Sensor Calibration Spreadsheet for Microsoft Excel NOTE Refer to Section 1 2 to ensure that your version of Excel is properly configured before using the PGA309 Calibration Spreadsheet for Microsoft Excel The PGA309EVM includes a Microsoft Excel spreadsheet that provides a way to perform a calibration of the sensor module PGA309 sensor The spreadsheet contains two parts Sensor Curve Fitting Equations Generation of Values for the PGA309 Temperature Lookup Table and Internal Register Settings The spreadsheet also contains VBA Visual Basic for Applications code that allows its integration with the Board Control Software These macros allow the user to exchange PGA309 settings between the program and the spreadsheet and save the resulting EEPROM configuration file The flexibility and wide availability of Excel determined the platform for this solution You are free to customize the sensor curve fit model to fit your sensor better The only prerequisites are familiarity with M
29. 312034 0 000266 04AF 0011 5 0 722944 0 00042 0 313332 0 000104 07D9 0006 0 728947 0 00048 0 3126 5 85E 05 0B02 FFFD 9 0 735743 0 000544 0E2C FFF2 0 743374 0 00061 0 305048 0 000383 1156 FFE8 5 0 751888 0 000681 1480 FFDE 0 76134 0 000756 0 289376 0 000708 17A9 FFD3 5 0 771795 0 000836 0 278495 0 00087 1AD3 FFC9 0 783326 0 000922 0 265584 0 001033HDFD FFBF 0 796016 0 001015 0 250644 0 001195 2126 FFB4 0 809964 0 001116 0 233674 0 001358 2450 FFAA 0 82528 0 001225 0 214673 0 00152 277A FFAO 0 842093 0 001345 0 193643 0 001682 2AA3 FF95 0 842093 O 0 193643 O0 7FFF 0000 OON OOaARWD Vout max and min calibrated Figure 43 Calibration Results Worksheet 10 Return to the Main Worksheet and click on the Save Register Lookup Table button to save the calibration results in a file Now load this file to the PGA309 EEPROM using Board Control Program by using the Open File button and then the Write EEPROM button 11 Verify that the output of the PGA309 is satisfactory 12 Optional To account for the Lin DAC offset and gain errors of the PGA309 ZeroDAC and GainDAC two additional measurements might need to be performed after Step 11 This should improve the calibrated output precision For example a sensor with span and offset drift errors on the order of 15 of span will have a post calibration error of less then 0 3 After the secondary calibration the error is typically less then 0 1 See Fi
30. 4 NetMeeting New Office Document Fi PGA3O9EVM Test Program Ej Real A d Internet Shortcut Explorer vspic gus y Hummingbird Modem H Neighborhood a0867024 Ww MSN Explorer x MSN Explorer C3 Windows Explore e Launch Microsoft Shortcut to Visio exe Shortcut to EXCEL E Shortcut to WINWOF Ay Acrobat Reader 5 1 M Notepad Texas Instruments E E iPassConnect V Paint Me Shortcut to vspice e PGASOSEVM Test Pra All Programs a Open Office Document E PeoplePC Online Set Program Access and Defaults W Windows Catalog 9 Windows Explorer A Windows Update YS Yahoo Messenger an Accessories f Adobe Fi Autodesk WHIP f BusinessObjects 5 1 l an Cisco Aironet m Cisco Systems FT Cisco Systems VPN Client E Dell Accessories Fi Evidence Eliminator Fi Exceed l an FinePrint pdfFactory m Games l an IBM techexplorer Hypermedia Browser Fi Intervideo WinDVD l an iPass l an Mathsoft Apps Ej Microsoft Office Tools Fi Modem Helper l an netDeploy 4 5 m Netscape Communicator m Norton AntiVirus Corporate Edition Fi Oracle For Windows NT m Remote Automation Management m Roxio Easy CD Creator 5 e Startup Fi TI Backup gm TIFTP E TI COMM For Windows Fi User s Guides m VisSim Comm 4 5 Documentation Fi VisSim Comm 4 5 Software Ej visualSpicePro E Winzip m xnview Ej Yahoo Messenger Ej Zone Labs 2 Ac
31. 48 742m Front End FGA v zero DAC v B74 303m Gain DAC V7 B74 020m Output Amp Gain V 24 Set Additional Simulate Constraints Device FGA ero Scale n Output PGA Full Scale 45 Output Figure 31 PGA309 Calculator m Add Constraints Eg The set additional constraints feature Bi ust allows you to set the Coarse Offset or Front End Gain to a fixed value iw Coarse Offset Apply cota Figure 32 Set Additional Constraints Another useful feature of the PGA309 calculator is to simulate the operation of the PGA309 Pressing the Simulate Device button on the PGA309 calculator will initiate the simulation Figure 33 illustrates the Simulate PGA309 form On this form you can see the state of internal nodes in the PGA309 s gain path Any violation of PGA309 specifications will be identified as an error Press the Set Input to Full Scale and Set Input to Zero Scale buttons and verify that your configuration complies with the specifications over your input range Any register can be modified to see the effect on the design Burr Brown Products fram Texas Instruments Page 38 of 62 w Simulate PGA309 Sensor Vref Excitation Coarse Offset Tn _ 2 35 Zero DAC 4096 v 3400 gi enm zlea avos 488 ENT Enable 20 Viel extemal lt 5 Vv Hee x y 1 808 iv ION 27V Vsa lt 55V E Lvcos 2 5 000 1 lt Zero DAC Dutput Range lt 4 9 Ysa
32. 533525 0 000543 277A 0 816855 0 000804 0 246553 0 000543 2 A3 0 816855 0 0 2465537 7FFF Vout max and min calibrated 4 51 4 505 45 Cal dvoutmin j Cal dvoutmas 4 495 4 49 50 Temp degC PiE p MIN Main Sensor Curvefit Calibration Results Template2T 3P Template2T_2P Temr Ready Figure 37 Calibration Results Burr Brown Products from Tazas Instruments Page 43 of 62 4 The remainder of the worksheets contain the templates of the curve fitting algorithms and back ground calculation data 9 4 Step by Step Calibration Using PGA309 Designer s Kit 1 The PGA309EVM Sensor Interface Board with a sensor or a custom module are initially configured as described in Section 8 2 It is measured at the first usually the room temperature 7meas7 and at either 2 or 3 pressure levels see Section 8 1 The output should be within the adjustment ranges of the Zero and Gain DACs It is important to enable the EXTEN and INTEN bits and or read back the Alarm Status Register 8 to see if any of the external or internal comparators raised a flag indicating either sensor fault or an internal signal path saturation In case of a fault or an unsatisfactory output signal range the coarse settings must be adjusted and the measurement repeated After a valid output range has been achieved the following settings must remain fixed Reference and Excitation Level Coarse RTI Offset
33. 9 nc AA N e Ving e pridge c5 Vvin2le V 6 NAN BL VoutF Ti O0luF is et NE RE 1 n F4 e TLL l Rp aere 0 01uF Vexe oJ o LED J3 1 AA A e e 1002 150p F Vbrt O o Lm RA 5 8 F3 Vin iko c4 V Va bod Vint O s in Test 1000pF INZ poet Vi O o n l Ext Ld 5 A Vin Test e 15 5 EST NR koi J6 TEMP Test GND O o J11 x i d TempO o o Rt M int AMD alae e GND O71 o n 2 11 RGO A i Bridge Rte e PC eee 4 amp 3 4 48 F73 Short Vbr Temp 0 jre e bo J12 V IL Ss J1 eps LE l Oow SS R5 Rt Test e e e GND e 0 VVV J7 10kQ hd Run e 1k amp 3 T 1kQ Tin Bridge Connections Vexc VET Notes 1 All components must be rated for 40C to 125C Vbr 4 Jumpers shown with factory settings Vint PGA309 Sensor Interface Board Schematic gt Vin gt Vbr February 4 2004 Rev 9 0 gt GND Burr Brown Products fram Taxas Instruments Page 11 of 62
34. 99 990m Detect Internal Saturation ZeroDAC 0x0640 Ox0000 0110 0100 0000 pu tection tena aie GainDAC OxFFFF 0x1111_1111_1111_1111 Baan re Gaal gt 2 400 Vout high on internal fault Ref amp Lin 0x0500 0x0000_0101_0000_0000 Enable Over Under Scale Limits wc PGA309 Temp ADC Gain Vos Cfg1 0x1611 0x0001 0110 0001 0001 Overscale Limit 3 976 DegC Cfg2 0verUnder 0x0A47 0x0000 1010 0100 0111 Cfg3 ADC 0x1603 0x0001 0110 0000 0011 zj Dec OutEnbl Counter 0x0000 0x0000_0000_0000_0000 Enable Sensor Excitation IV Hex Vexc ADC Config AlarmStatus RO 0x0000 0x0000_0000 0000 0000 3 400 c Config Checksum 0x705B 0x0111 0000 0101 1011 Linearization Coef v v 0 000 Underscale Limit 547 808m TUNES Interface Board and ADS1100 0640 FFFF isplay Mode 0000 71C1 Binay C Supply Vcc V 5 0 9 Vok 0 73257 Decimal C oA Hex eee a Eum e PGA Interface TwoWie C Keep comm alive Instant Update M e Show 1kBit Autocale Chksum Iw Dne Wire EEPROM Update COM Port Checksums Setup EEPROM Lookup Table Board Communcation Idle Figure 14 Main Window After Open File PGA309 DK Test txt Burr Brown Products fram Taxas Instruments Page 22 of 62 Table 3 details the PGA309 settings defined by this file PGA309 DK Test txt Desired Setting OV to 33 67mV Adjust Rrest from OQ to 200 4 096V Use Internal PGA309 Reference Vexc 3 4V Use Linearization Circuit Range 0
35. Board to the PGA309 PC Interface Board are provided through Tio an 8 position screw terminal strip This connector provides ease of connections to wires for the required selected signals when placing the PGA309 Sensor Interface Board inside a temperature chamber for PGA309 Sensor calibration In parallel with Tio is Jtest which provides a means for direct plug in connection to the PGA309 PC Interface Board This is useful for initial checkout of the PGA309EVM system 3 2 Jumper Configuration J1 J2 J3 J4 J5 J10 and J11 allow flexibility in the configuration of the connection to a bridge sensor These jumpers also allow connection of the on board test resistor Rrgsr used for testing functionality of the PGA309 without any bridge sensor connected Rt and Rt allow for resistors to be used in the top or bottom of the bridge sensor s excitation path for one method of measuring bridge temperature by total bridge resistance changes Jumper J6 is used to configure the PGA309 circuit for external or internal temperature sensing lf external temperature sensing using an RTD or external diode is to be used then set J6 to EXT and remove the J1 jumper entirely to avoid any interaction with Rt or Rt J9 provides hardware configuration for either internal or external reference voltage J8 is used when Vout is to be tied to PRG for a 3 terminal sensor module configuration J12 and J7 together decide if the Test pin on the PGA309 is to be controlled by the PGA309
36. Burr Brown Products PGA309EVM from Texas Instruments User s Guide SLOROS7D February 2004 Revised January 2006 PGA309EVM Designer s Kit for PGA309 oO L j 1111171 i rface Board D ww PGASOS A Interface Board Jb EE T ef em lt Burr Broun Products eim a re from Texas Instruments DS Ki alee DIETE a On A 02 MUE RT 4503 x REF so F8 ut Pin 1 S Jtes Burr Broun Products from Texas Instruments T1711 x sessacs O e 9992 TJ eeeeeean CG s s s s eeeeeeee CC eseeeeee 9 eeeeeeee eveeevees f aeeeeees ff ee ee assecat eeaeeaeeee saacana Ft eseensas eaeeeeee eee ee T1211 ll TUTTI lI eseaeceee aeececeee oe eeeee eeeeeee eeeneee eee eee eevee eee ees TIT 9 o0 3 A 272 2II LI C DICE Clo VIE b a Of sj I US Test Li m t M12 occ P Est LIE E E OM ON D E nonem IEEE I lt T o Uno MESE eS ri ae E Byes a Tarp m Aus i PE 15 l ACI p16 tl fel A Tr j a i 4 AME AC p ol SHES unn wie afl lilo E Ap ZW Fz Vout E WEN A c2 fk 1 Ceteri Fre J IET CTS r Do AD TT LLL poti out fi du CRT fi DEN prm a kjo E 2 fel oo 2O00C oooooooooooooooooooooott OOOOOOOOOOO0OOOOo00Oo0O00o0 560 le eeee88888 eeeeee eee TERNI eae 112 E eee eee ees eaeeeseaev e e2eee888088 XX ii A eeee see ee TELELE E eeeeeeee8 9999999
37. E Update Vout Settings Keep comm alive Ux3078 Ox13F0 ADC Out RO ZeroDAC GainDAC Ret amp Lin Gain Vos Cfg Cig2 OverUnder Cfg3 ADC Dx0000 1010 0100 0111 Dx0001 0110 0000 0011 14 TAI Output Amp Gain V V 2400 x0500 0x1611 Ox0A47 0640 0000 PGA Interface T wow Instant Update SS EIE E Ej Autocale Chksum jv Dnewie e EEPROM Update COM Port Checksums Cae EEPROM Lookup Table Bitmap of a register Detecting PGA309 board Please stand by Figure 9 Software Startup Wrong Com Port Click on OK in the pop up window in Figure 9 Then click on COM Port Setup in the Main Window A new pop up window will appear as in Figure 10 Select the serial port where the board is connected and desired Baud Rate and click OK Ensure 1Wire Interface is selected Select Serial Port Interface Port H X 2wire Baud Rate goqg wie Apply Detect Cancel Show 1kBi Figure 10 COM Port Pop up Window Burr Brown Products fram Taxas Instruments Page 20 of 62 Another pop up window will appear as shown in Figure 11 Click Yes and the two pop up windows should disappear with only the Main Window remaining as in Figure 8 A 33 Texas Instruments PGA309 Designer s Kit Control Program mu D E m 24 we a 9 9 i Reset Open File Save File Detect Write PGA309 Read PGA309 Write EEPROM
38. Kexc 0 83 LinDAC 0 Coarse Offset 3 277mV _ Front End PGA Gain 640 GainDAC O 1 0 0 ooo Output Amplifier Gain 24 0000000000000 Zero DAC 100mvV OverScde 8 976eV 01 0 Unde Scde 1 0 245SV 0 0 0 0 With Over Scale and Under Scale enabled Fault Detect Polarity Positive Internal Comparators Disable Continuous Conversion Mode EEPROM Temperature Set so all temperatures 128 C will use Coefficients same Gain DAC and Zero DAC settings Table 3 PGA309EVM Sensor Interface Board Functional Test Settings Equations for Table 3 Vout Vprre Front End PGA Gain Gain DAC Output Amplifier Gain Coarse Offset Front End PGA Gain Gain DAC Output Amplifier Gain Zero DAC Gain DAC Output Amplifier Gain Voirr 64 1 2 4 3 2 7 mV 64 1 2 4 100mV 1 2 4 Vout Voirr 153 6 0 2633V Vout Burr Brown Products fram Taxas Instruments Page 23 of 62 Schematic for PGA309 Configuration in Table3 5V Two Wire EEPROM PGA309 Rrest 2002 10 Turn R2 1ko2 3 Write these settings to the PGA309 Sensor Interface Board EEPROM by clicking on Write EEPROM in the Main Window Click on Read EEPROM and then click on Read PGA309 The Main Window should look the same as in Figure 14 4 Configure ADS1100 for continuous readback In the Main Window click on Board Settings The St
39. Mode settings 7FFF 0000 CCAE Bay C SupppVec VE 4 963 Hex fe Volt 3 03986 mm Decimal Dec haa Figure 29 Set PreCal EE Button Burr Brown Products fram Taxas Instruments Page 36 of 62 8 0 PGA309 Calculator Software for Gain Offset Calculation and Simulation The PGA309 Calculator is a software program that helps to calculate initial gain and offset settings based on your sensor information The tool also checks to see if the design violates any of the PGA309 specifications To start the PGA309 Calculator you select the PGA309 Calculator under the Start menu All Programs PGA309 Designer s Kit as shown in Figure 30 m Fowertoys Tor windows AF rs Real k rn Texas Instruments Roxio Easy CD Creator 5 fan PGA308 Designer s Kit EH Calibration Spreadsheet e 4 PGA309 Calculator PONES QI Symantec Gent Security PGA309 DK Board Interface 3 Windows Explore E TI COMM 4 Windows TN3270 We 3 Microsoft Excel m Winzip EX Adobe Reader 6 0 4 Burn CD amp DVDs with Roxio li PGA309 DK Board Inj Internet Explorer Microsoft Visual Basid Microsoft Excel fs Microsoft PowerPoint Microsoft Outlook Ef pcazos Calculator Microsoft PowerPoint Cl winzip Microsoft Word 4p USB MODEvMtester J NetMeeting w Microsoft Word et Outlook Express EB Tina RealOne Player r Remote Assistance Al Programs Windows Journal Viewer P Wi
40. PC Interface Board or hardware programmed on the PGA309 Sensor Interface Board 3 3 PGA309 External SOT23 5 EEPROM U1 is the PGA309 for evaluation Also on board is a 16k bit external SOT23 5 industry standard Two Wire EEPROM U2 Although the PGA309 needs only 1k bit of external EEPROM to access its configuration registers plus the maximum number of 17 temperature coefficients both the One Wire and Two Wire interfaces allow access to locations in much larger EEPROMs which can be used to store user specific information such as a serial number lot and date code information etc Burr Brown Products fram Taxas Instruments Page 7 of 62 3 4 Protection and Filtering The PGA309 Sensor Interface Board is configured with components to prevent mis wire mishaps If power is provided from the PGA309 PC Interface Board D1 is adequate to protect from overvoltages and reverse polarity connections CL is a standard EMI RFI capacitor design with Riso and Rp providing up to 16V overvoltage on VoutF Input common mode plus differential noise filtering is provided by C3 C4 C5 and R3 R4 3 5 Test Points and Miscellaneous Breadboard Area There are several Test Points including a 3 position one for GND provided for ease of measuring analog signals Also provided are reserved areas with plated through standard spacing 0 1 holes for miscellaneous proof of concept breadboarding as desired for a given application 4 0 PGA309 PC Interface Board Overvi
41. Rp for One Wire PRG communication on the PGA309 PC Interface Board After Sensor Calibration is complete a final write to the EEPROM is done During this final write to the EEPROM the PGA309 One Wire interface PRG pin can be configured to be disabled This means that it can now float without any adverse consequences such as high current draw through Vs or erroneous digital communication due to transients on the PRG pin To disable the One Wire Interface set the OWD bit to 1 during the final EEPROM program write The OWD One Wire Disable bit is located in Register 4 Bit15 After this final programming all is not lost as any power up sequence will allow the One Wire Interface PRG pin control if communication is initiated within 25ms of the application of power to the PGA309 Power Supply T Rp 4 7kQ Vs Customer 1 Voc Sensor PC PRG i PRG q p R5232 Vour l Vin e A PGA309 GND 10nF GND ji SDA SDA SCL SCL i i EEPROM PGA309 Ge PC Interface Board Temperature a Chamber PGA309 Sensor Interface Board 40 C Temperatue 125 C Pressure Input Figure 47 PGA309 4 Wire Sensor Module Application Burr Brown Products from Texas lnetrumanty Page 51 of 62 10 3 Regional Settings P
42. Settings Burr Brown Products fram Texas Instruments Page 14 of 62 6 2 PGA309 PC Interface Board Factory Jumper Settings Confirm and or set the jumpers on the PGA309 PC Interface Board as shown in Figure 4 The desired jumper settings are also described in Table 2 PGASOS PC Interface Boar d b E mx eL qu nr 22 L LI LJ C23 Burr Broun Products DSt 1 nreL d ne C24 ES from Texas Instruments D esp J Ux R21 6 E26 ac C dd m o ce Tpur Us LHN 5 ai 1 Ca d LJ d D3 Pin 1 R15 Co N amp in ES T 3 E 2 Hi GL S eU pim 2p J Ci Ti e De CI Co ee aie ege enon QTY 8H o TL 5 gy C ci d 1 LI Co JN 0 o1 e 62 N Ja EREEEEI PRET rn a T LED1 Pt Ro LED2 C R13 BIS ET ca ND il GND D ra Ppc RJ 45 e e e ej e e e ej Rev A Boards Only Figure 4 PGA309 PC Interface Board Factory Jumper Settings PGA309 PC Interface Board Factory Jumper Settings Rev A Boards Only Table 2 PGA309 PC Interface Board Factory Jumper Settings Burr Brown Products from Texas Instruments Page 15 of 62 6 3 Hardware Setup see Figure 5 Plug the PGA309 Sensor Interface Board into the PGA309 PC Interface Board On the PGAS309 PC Interface Board connect a 6Vdc 6Vdc 9Vdc Lab Supply into Tpwr or an AC Wall Adapter 120Vac RMS eoHz in 6Vdc 200mA out USA Shipments Only into Jowr Connect the PGA309EVM PC Cable from Ppc RJ 45 jack on the PGA309 PC Interface Boa
43. an be extracted from the spreadsheet cell formulas 9 2 Calibration of Signal Path Errors Since we are interested in calibrating the output of a full module Sensor PGA309 we can measure the output of the PGA309 Then we curve fit the result to the same model This will take into account all offsets gain errors and drifts of the amplification signal path PGA309 and sensor must be pre configured with desired settings reference excitation level coarse gain offset A D configuration etc The coarse settings should be based on preliminary characterization of the sensor and be such that the PGA309 produces a reasonable valid output signal range say within 20 of the target at both zero and full scale pressure level without saturating the internal signal path Since the circuit offsets can be different at different gains and offset levels the values of the all coarse settings must remain constant during the calibration processes The Lookup Table containing the values of the fine Zero and Gain DACs vs Temp ADC output is created during the calibration to produce the desired output signal at all temperatures We recommend to set both Zero and Gain DACs at mid scale each during calibration as this allows most adjustment range for calibration NOTE Set LinDAC 0 linearization disabled during calibration or a repeated re calibration Its value is also calculated during calibration Burr Brown Products from Tazas Instruments Page 40 of 62
44. ation Data 8 4 2 1 8 4 2 1 8 4 2 1 8 4 2 1 Upper Byte Lower Byte External EEPROM PGA309 PGA309 Address Internal Register Internal Address Decimal Address Description Data D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 DO Hex Eq 1 0 Programmed Flag Value MSB LSB Must be as Shown 0 1 0 1 0 1 0 0 0 1 0 0 1 0 0 1 5449 3 2 Unused MSB LSB Set to Zero 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 5 4 Unused MSB LSB Set to Zero 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 7 6 00011 MSB LSB Register 3 Reference Control amp Linearization RFB RFB RFB RFB EXS EXEN RS REN LD7 LD6 LD5 LD4 7 6 0 0 0 0 0 1 0 1 0 0 0 0 0500 9 8 00100 PGA Coarse Offset amp Gain Output Amp MSB LSB Register 4 Gain OWD GO2 GO1 GOO GI3 Gl2 Gi GIO RFB RFB RFB OS4 9 8 0 0 0 1 0 1 1 0 0 0 0 1 1611 11 10 00101 PGA Configuration amp Over Under Scale CLK_ CLK _ MSB LSB Register 5 Limit RFB RFB CFG1 CFGO EXTEN INTEN EXTPOL INTPOL RFB OUEN HL2 HL1 11 10 0 0 0 0 1 0 1 0 0 1 0 0 0A47 13 12 00110 MSB LSB Register 6 Temperature ADC Control RFB RFB ADC2X ADCS ISEN CEN TEN AREN RV1 RVO M1 MO 13 12 0 0 0 0 0 1 1 0 0 0 0 0 1603 8FA4 15 14 FFFF sum Hex Eq of each location 1 0 MSB LSB thru13 12 truncated above 16 bits Checksum1 1 0 0 0 0 0 0 0 0 1 1 0 705B 8 Bit EEPROM Load gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt Loca
45. atus Window ADS1100 and PCF8574A Status Window will appear as in Figure 15 Burr Brown Products ris denis Page 24 of 62 B 3 Texas Instruments PGA309 Designer s Kit Control Program Rese PRG pi able Internal Vref V PGA30 Volt wohl abe Calibrate ADS1100 sf Value 4096 v Click on Hex ault Detection Read ADS1100 Read ADS1100 Gen Call Reset Detect External Faults Decimal Continuously Gen CallReset Detect Internal Saturation out high on external fault ADS Output Register out high on internal fault D15 D14 D13 D12 D11 D10 D9 DB D7 D6 D5 D4 D3 D2 D1 DO GA309 Temp ADC B E N NE NC NC og gog g ggg eac peris aeoe MSB LSB ec ex fBh cen ds im a ADS1100 Configuration Status Register EVM PCF8574A Convert Test ADS1110 SEQ qms Bo Em dw pin nLED2 nLED1 Cal 3 2wwvenavSer1Vyen H o o o E a u o 0 o 1 0 0 Jg erface Board and ADS1100 MSB LSB MSB LSB Supply Vcc VY 5 0 Hex Board Update Vout Settings PGA Interface Two Wire C Keep comm alive T Instant Update One Wire Show 1kBit Autocalc Chksum jw EEPROM Update COM Port Checksums Setup EEPROM Lookup Table Bitmap of a register Board Communcation Idle Figure 15 Status Window 5 In the Status Window check the box to Read ADS1100 Continuously 6 In the Main Window set Supply Vcc V to 5 0V 7 The Rtest potentiometer and J4 on the PGA309 Sensor Interface Board
46. bration Spreadsheet for Microsoft Excel provides a useful tool to calculate optimum temperature coefficients for the PGA309 Sensor calibration based on real world measurements of pressures at different temperatures The PGAS309 Calibration Spreadsheet also contains Visual Basic for Applications code that allows its integration with the Board Control Software These macros allow the user to exchange PGA309 settings between the program and the spreadsheet and save the resulting EEPROM configuration file Burr Brown Products fram Texas Instruments Page 6 of 62 Power Supply T Customer Vec Sensor PC PRG lt o RS232 ER Voi l Vin AN PGA309 GND 10nF GND T SDA 3 SCL EEPROM i PGA309 Ge PC Interface Board PGA309 Sensor Interface Board Temperature M d Chamber 40 C lt Temperatue lt 125 C Figure 1 PGA309DK Typical System Setup Pressure Input 3 0 PGA309 Sensor Interface Board Overview Refer to PGA309 Sensor Interface Board Schematic 3 1 Input Output Bridge sensor input connections are made though Tin an 8 position screw terminal strip In parallel with Tin are plated through holes that are provided for solder connections if so desired The connections from the PGA309 Sensor Interface
47. ct the calibration algorithm One of the Following three templates can be used For the pressure sensor calibration Cancel Select this when you do not know the 2nd order non linearities oF output vs pressure and of temperature drifts of span and offset The module output must be measured at three different temperatures with min and Fulll scale pressure applied plus mid scale pressure at one af the temperatures 2 Temperatures and 3 Pressures The 2nd order coefficients of temperature drifts of span and offset are known but Ehe non linearity of output vs pressure must be measured The module output must be measured at only two temperatures with min and Fulll scale pressure applied plus the mid scale pressure at one of Ehe temperatures 2 Temperatures and 2 Presures All 2nd order coefficients are entered based on pre characterization only the positions of curves must be Fitted The output must be measured at only Ewa temperatures each with min and full scale pressure applied Figure 39 Select Calibration Algorithm Dialog Choose Temperature Measurement Method E t Use Rt Tempature Measurement with Quadratic fit t Use Rt Temperature measurement with 1 aT 2 bT c fit Figure 40 Choose Temperature Calibration Method Burr Brown Products from Tazas Instruments Page 45 of 62 F Verify and correct the parameter values in the light blue cells on the Sensor Curvefit Worksheet Figure 41 Note that the E
48. data 7 1 1 General Note on Reading amp Writing to PGA309 and External EEPROM When you do a Write EEPROM whatever is in the Main Window will be written to the PGA309 external EEPROM EXCEPT for the Zero DAC and Gain DAC values in the PGA Settings section of the Main Window However in the case of the Zero DAC and the Gain DAC it does not make any sense to write to the EEPROM the settings in the section PGA Settings since the Zero DAC and Gain DAC settings can be many values as defined by the Lookup section of the EEPROM To write Zero DAC and Gain DAC settings into EEPROM you must update or change the Lookup Table section in the Main Window Also if you type a number into the Zero DAC or Gain DAC boxes in the PGA Settings section of the Main Window and then do a EEPROM Read the previously typed numbers will remain To read the current Gain DAC and Zero DAC settings of the PGA309 internal registers and have them updated and displayed in the PGA Settings section of the Main Window click on the Read PGA309 Button If you want to try different settings on the PGA309 then it is best to check the box PGA309 Test Pin High in the upper middle area of the Main Window which stops the PGA309 from reading the EEPROM and allows you to Write PGA309 which will directly change but NOT save to EEPROM the Zero DAC and Gain DAC settings for trial offset and gain settings etc Burr Brown Products from Texas
49. e energy saving settings for your computer CA Printers and Faxes Shows installed printers and Fax printers and helps you add new ones QuickTime Configures QuickTime software and hardware components Sy Regional and Language Options Customize settings For the display of languages numbers times and dates 8 Remote Control Configures remote control settings Nu B Scanners and Cameras Add remove and confiqure scanners and cameras M EA Scheduled Tasks Schedule computer tasks to run automatically Sounds and Audio Devices Change the sound scheme for your computer or configure the settings For your speakers and recording devices a Speech Change settings for text to speech and for speech recognition if installed symantec LiveUpdate This applet allows you to configure your LiveUpdate settings System See information about your computer system and change settings for hardware performance and automatic updates E Management Configures this computer to be managed by Systems Management Server gll Taskbar and Start Menu Customize the Start Menu and the taskbar such as the types of items to be displayed and how they should appear d 89 User Accounts Change user account settings and passwords For people who share this computer GE Wireless Link Configure infrared File transfer image transfer and hardware settings Customize settings For the display of languages numbers times and dates ET ge d RENE iPassConnect Shortcut to Calcula
50. e in the Supply Vcc V box in the Main Window or enter this voltage into the Vs box in the pop up window After these two ADS1100 calibration steps are complete the ADS1100 is fully calibrated for both gain and offset errors Each time the Calibrate ADS1100 Button is pushed a new ADS1100 offset calibration is performed and the subsequent readings will use the latest calibration numbers If the Read ADS1100 button is pushed a single conversion will be performed in the ADS1100 The reading will be updated in both the Main Window and in the pop up window If the box labeled Read ADS1100 Continuously is checked then both the pop up window and Main Window ADS1100 readings will be updated about every 2 seconds depending upon the operating system conditions The ADS Output Register section in the pop up window is a read only bit readout of the latest ADS1110 conversion The ADS1100 Configuration Status Register bits allow for custom configuration of the ADS1100 These bits are toggled by a one click method in the corresponding box The default setting is Ox8C This configures the ADS1100 for Continuous Conversion Mode Internal PGA x1 and 8 samples per second data rate If these settings are changed they can be returned to the initial power up settings by pushing the Gen Call Reset in the pop up window If the Vcc voltage on the PGA309 PC Interface Board is changed then the ADS1100 will need to be re calibrated for gain and offset thi
51. efit Calibration Results Template Rt2 Template Not Rt Template Rt Template Not Rt2 Template2T 3P Template2T 2P Template3T 3P i mim Draw hb Auoshapes Ww O CO Bil Mi Fi iN Aa B B Ready Figure 35 Sensor Curvefit Worksheet Burr Brown Products ris dria Page 42 of 62 Upon completion of the measurements the fitted sensor function is displayed on two plots located on this worksheet see Figure 36 Bridge sensitivity vs temp Kbridge vs pressure Troom 6 0E 02 6 0E 02 5 0E 02 gt 5 0E 02 gt T 3 4oE o2 gt 4 0E 02 4 i o o 3 0E 02 Offset 5 3 0E 02 4 Span 5 o oeb 2 0E 02 J E 5 seen E 1 0E 02 J en Fa ee 0 0E 00 PUR at o BH 400 15b 0 10 20 30 40 50 60 70 80 90 100 Temp degC Pressure Figure 36 Approximated Sensor Curves 3 The third worksheet is called Calibration Results see Figure 37 It contains the calculated lookup table based on the curve fitting coefficients from the calibration measurements The blue fields are for the user data with the desired output voltage scale compensation temperature range and the number of the lookup table points needed The framed cells contain the messages about the validity of the calculated values whether the DAC and Temp ADC values are in linear range achievable by PGA309 at all temperature
52. egister tab in the bottom left corner of the Main Window the Main Window view will change to that of Figure 21 The lower left quadrant of the Main Window now displays detailed information about the PGA309 register selected by clicking on a specific register listed in the PGA309 Registers section of the Main Window Each bit in the selected register may be toggled by double clicking on the desired current bit setting A brief description of each bit also appears If the Instant Update check box in the lower right of the Main Window is not checked than the Write PGA309 button will need to be pushed Remember if you do not want the register settings in the PGA309 to be over written by valid PGA309 external EEPROM data then ensure the PGA309 Test pin is set high by checking the PGA309 Test Pin HIGH box in the upper left area of the Main Window Burr Brown Products fram Taxas Instruments Page 29 of 62 Mg 49 Texas Instruments PGA309 Designer s Kit Control Program File Edit Board Setup D zx mi ur at Reset Open File Save File Detect Write P309 Read PGA309 Write EEPROM Read EEPROM PGASOS Test Pin HIGH w Sekine aan Coarse Offset mw 3 432m Enable Internal vret w FrontEnd PGA Gain V v lea goo Vref value 4 096 M PGA309 Registers Click on the register to edit the value and see the details Fault Detection Binary up 100 000m Detect External Faults r7 ADC Out RO OxO000_0001 1010 0111 Gain
53. ers and Cameras scanners and cameras a EI Scheduled Tasks configures remote control settings automatically Sounds and Audio Devices Change the sound scheme for your computer or configure the settings For your speakers and recording devices a Speech Change settings For text to speech and For speech recognition if installed D Symantec LiveUpdate This applet allows you to configure your LiveUpdate settings X system See information about your computer system and change settings For hardware performance and automatic updates il Systems Management Configures this computer to be managed by Systems Management Server gl Taskbar and Start Menu Customize the Start Menu and the taskbar such as the types of items to be displayed and how they should appear amp 3 User Accounts Change user account settings and passwords For people who share this computer Wireless Link Confiqure infrared File transfer image transfer and hardware settings Customize settings For the display of languages numbers times and dates Figure 50 Control Panel Burr Brown Products fram Taxas Instruments Page 53 of 62 Step 2 As in Figure 50 select and click on Regional and Language Options in the Control Panel window A new pop up window Regional and Language Options will appear as in Figure 51 Regional and Language Options r T Regional Options Languages Advanced Standards and formats This option affects how some pro
54. ew Part 1 Refer to PGA309 PC Interface Board Schematic Sheet 1 of 2 4 1 Input Output The connections from the PGAS309 PC Interface Board to the PGA309 Sensor Interface Board are provided through Tio an 8 position screw terminal strip This connector provides ease of connections to wires for the required selected signals when placing the PGA309 Sensor Interface Board inside a temperature chamber for PGA309 Sensor calibration In parallel with Tio is Ptest which provides a means for direct plug in connection to the PGA309 Sensor Interface Board This is useful for initial checkout of the PGA309EVM system Ppc is an 8 position RJ45 jack for connection through the PGA309EVM PC cable to a test computer s RS 232 serial port RS 232 compatible signals are generated through U9 Power for the PGA309 PC Interface Board is provided through either Jpwr or Tpwr Jpwr is to be used when an AC Wall Adapter 120Vac RMS 60Hz in 6Vdc 200mA out is available USA Shipments Only Other applications will use a 6Vdc 6Vdc 9Vdc lab supply and the screw terminal inputs on Tpwr U7 provides a regulated power source of either 3V or 5V selectable through JA D3 provides protection from inadvertent reverse polarity connections on Jpwr or Tpwr 4 2 Port Expander Configuration Control U5 is an 8 bit serial port expander PCF8574A which allows user control over the configuration of the PGA309 PC Interface Board D1 and D2 are controlled by the Board Control Software and
55. gister to edit the value and see the details ADC Out RO ZeraDAC GainDAC Ref amp l in Gain Vos Cfg1 Cig OverUnder Ciga ADC QutEnbl Counter AlarmStatus RO Config Checksum Lookup T able 0800 0640 FFF 0000 FFFF 71C1 EEPROM Lookup Table Board Communcation Idle Figure 8 Software Startup Main Window Burr Brown Products from Texas Ingtrumants x3078 x13F 0x0500 0x1611 x AAT 0x1603 0x0000 x0000 x SB 0x0011 0000 0111 1000 Ux0001 0011 1111 0000 Bitmap of a register PGA Settings Coarse Offset mv 3 482m FrantEnd PGA Gain V 7 64 000 zem DAC v 319 000m Gain DAC V V T27 49m Output Amp Gain V V 15 499 T Enable Over Under Scale Limits rJ Overscale Limit 3 976 Underscale Limit 247 808m Enable Sensor Excitation mI VeHC 5 400 Linearization Coet v v 0 000 Display Mode Binary Hex ir Decimal C Poa E Show TkBit EEPROM Keep comm alive Instant Update Autocale Chksum w Update COM Port Checksums Setup A e rd e Write EEPROM Read EEPROM Set PreCal EE Enable Internal ret w Vref Value 4 096 Fault Detection Detect External Faults Detect Internal 5 aturation Vout high on external Fault Vout high on internal Fault PGA309 Temp ADC Degl 75 5 degC Dec 12408 Hex 3078h ADC Config Convert Interface Board and AD 51100 Supply vec V I
56. grams format numbers currencies dates and time Select an item to match its preferences or click Customize to choose your own formats Polish mm nM Samples Number 123 456 789 00 Currency 123 456 789 00 zl Time 16 09 31 Short date 2004 06 21 Long date 21 czerwca 2004 Location To help services provide you with local information such as news and weather select your present location United States Figure 51 Regional and Language Options pop up window Step 4 Click on the Advanced tab in the Regional and Language Options pop up window The pop up window will change as shown in Figure 52 Regional and Language Options Regional Options Languages Advanced Language for non Unicode programs This system setting enables non Unicode programs to display menus and dialogs in their native language It does not affect Unicode programs but it does apply to all users of this computer Select a language to match the language version of the non Unicode programs you want to use A V Code page conversion tables 10001 MAC Japanese 10002 MAC Traditional Chinese Big5 10003 MAC Korean 10004 MAC Arabic 10005 MAC Hebrew Default user account settings Apply all settings to the current user account and to the default user profile Figure 52 Advanced tab view in Regional and Language O
57. gure 19 PGA309 External EEPROM Pop up Window Burr Brown Products fram Taxas Instruments Page 28 of 62 PGA309 Internal Registers D15 D14 D13 D12 D11 D10 b9 jb8 b7 bs b5 p4 D3 D2 J D1 JDO Location 1 Location 0 Upper Byte Lower Byte External EEPROM EEPROM Address pe D7 be pb p4 D3 b2 D1jDO Oh E D15 D14 D13 D12 D11 D10 Do D8 Ofh Figure 20 PGA309 Internal Registers to PGA309 External EEPROM Mapping For updating the information in the EEPROM Lookup Table section simple click and edit the desired values Next click on the Apply Changes button in the EEPROM Lookup Table section This only updates the information for the Lookup Table information stored on the Test PC If these new values are desired to be written into the external EEPROM then after the Apply Changes click one must click on the Write EEPROM button at the top of the Main Window If the changes edited in the Lookup Table are desired not to be kept on the Test PC then click on Discard Changes and the last values in the Lookup Table stored on the Test PC will be restored The other way to directly write to the external EEPROM is through the PGA309 External EEPROM Pop up Window as shown in Figure 19 and discussed above 7 3 PGA309 Registers The PGA309 current internal register contents are displayed in the PGA309 Registers section of the Main Window By clicking on the Bitmap of a r
58. gure 44 Burr Brown Products ri dria Page 47 of 62 The correction factors generated by the secondary calibration are shown here The After the first calibration is complete Take zero and full scale data at room temperature GainDAC Correction should be about close to 1 0 and the ZeroDAC correction should be close to zero This secondary calibration will improve the overall accuracy Insert TempADC reading in active cell 16 17 Measurement Temperatures 18 Tmeas1 at Vout reading in active cell TempADC Reading Tmeas this Temp 3 pressure levels are applied 19 Tmeas2 20 TImeas3 21 22 In i E Post First Ca orrection 23 Measured Data RTlSpan V V Wea Data 24 VoutMeas RTI Kbrg v v Pressure 2b 2 83E 05 26 20 50 1 84E 03 2T 20 i 100 3 54E 03 29 85 i 0 5 88E 05 30 95 i 100 3 556 03 31 32 40 7 0 6 75E 05 33 40 i 100 3 54E 03 34 Room Temp Gain Error 1 00036 35 Roam Temp Cor Gain Dac 064081088 36 Fost Cal RTI Kbrg Pin min 3 731E 05 GainDAC Correctiog Jf Post Cal RTI KbrgiPin max 0 01344402 ZeroDAC Correction 38 Set Pressure 0 and measurements at 3 temperatures 39 Matrix ResultVector1 Solution coefs vals Figure 44 Second Calibration for Improved Accuracy 9 5 Customization of the PGA309EVM Calibration Spreadsheet All of the cells as well as the VBA code in the spreadsheet are open and can be modified and adjusted for individual des
59. ially powered up the Vout pin is placed in a high impedance mode for 15mS If communication is established using the one wire during this time the PGA309 will keep Vout in high impedance until the communications is complete After the communication is complete the PGA309 Vout pin will become active and remain active until power is cycled again While using the EVM to communicate in three wire mode the EVM will cycle power before each one wire communication See Figure 28 Burr Brown Products fram Taxas Instruments Page 35 of 62 Vcc C O SENSOR O 0 C C Vout x One Wire D L Test Q GND D C H Figure 28 Three Wire Configuration One of the key considerations when using connecting a module in a three wire configuration is use of the test pin during calibration The test pin is typically used during calibration to place the PGA309 into test mode The main benefit of test mode is that the Gain DAC and Offset DAC are forced to be constant while the device is in test mode In the case of three wire mode the test pin is grounded and cannot be used In this case an EEPROM table can be built that will force that Gain DAC and Offset DAC to be constant The PGA309 Designers Kit Control Program Set Precal EE feature simplifies the creation of this table The Operation is as follows 1 Configure all the registers as is required by your application 2 Press the Set PreCal EE butt
60. icrosoft Excel capabilities and some limited knowledge of Visual Basic for Applications 9 1 Sensor Curve Fitting Equations The built in equations approximate the sensor with second order polynomials for each of the sensor three variables Span vs temperature Zero offset vs temperature Output signal vs sensor input variable it will be simply called pressure from now on but can also be flow or another measured physical parameter The sensor curve fit equation for this case is Equation K u p T ky KT k T p kp k T kT where Kpriage bridge output function in V V of excitation p sensor input variable pressure etc T temperature in degrees C ko K K2 offset polynomial coefficients initial first and second order drift k3 k input variable sensitivity and non linearity ks Kg span first and second order temperature drift This is the sensor model used in the PGA309 Calibration Spreadsheet Burr Brown Products from Texas Instrumonts Page 39 of 62 There are three degrees of freedom in this equation offset and span vs temperature and sensitivity vs pressure each of them is described with a quadratic equation If we don t know much about the sensor besides that it can be approximated with the Equation we need to measure three points on each degree of freedom for curve fitting i e 9 measurements zero and full scale output at 3 temperatures each for offset and span and output at 3 pressu
61. ign and sensor properties The name of the custom sensor curve fitting function is sensbridge This function can be modified to fit sensors modeled by more complex equations than shown in Equation1 In this case the following parts of the spreadsheet must also be updated curve fitting coefficient equations in the framed area A17 152 worksheet Sensor Curvefit references to the sensbridge in the cell equations in the worksheet Sensor Data vs Temp columns D F K L references to the sensbridge in the cell equations in the worksheet Sensor Data vs Pressure column B Note The equations generating the Lookup Table in the worksheet Calibration Results can stay Burr Brown Products from Tazas Instruments Page 48 of 62 10 0 General Operating Tips 1 During initial evaluation of the PGA309 Sensor it is recommended to leave the PRG pin separate from the Vout pin of the PGA309 Disable the Two Wire interface on the PGA309 PC Interface Board and use the One Wire Interface Disabling the Two Wire interface keeps communications to the PGA309 PC Interface port expander PCF8574A and A D Converter ADS1100 from being delayed by the PGA309 talking to its external EEPROM if PGA309 is in Stand Alone Mode Communication on the One Wire interface will always be recognized and will stop PGA309 to external EEPROM communication 2 For final production testing on 3 terminal sensor modules Vcc GND Vout where PRG is tied to Vout use the One Wire
62. in Figure 58 Notice that under the Number section in this window the decimal separator of the number displayed is shown as a period instead of it original setting in Figure 55 of a comma hortcut to Shortcut to PeoplePC Shortcut to Shortcut to E Regional and Language Options Regional Options Languages Advanced Customize Regional Options Numbers Currency Time Date Sample Positive 123 456 789 00 Negative E 23 456 789 00 Decimal symbol No of digits after decimal Digit grouping symbol Digit grouping 123 456 789 Negative sign symbol Negative number format 11 Display leading zeros 0 7 J List separator Measurement system Metric Digit substitution None hortcut to Shortcut to PeoplePC Shortcut to Shortcut to p Regional and Language Options fx Regional Options Languages Advanced Standards and formats This option affects how some programs format numbers currencies dates and time Select an item to match its preferences or click Customize to choose your own formats Polish v Samples Number 123 456 783 00 Currency 123 456 789 00 z Time 16 29 20 Short date 2004 06 21 Long date 21 czerwca 2004 Location To help services provide you with local information such as news and weather select your present locat
63. ion United States v Figure 58 Return to the Regional and Language Options window after Decimal symbol changes Burr Brown Products fram Taxas Instruments Page 57 of 62 Step 7 In the Regional and Language Options window as in Figure 58 click on OK This will close all pop windows and you will be back at the main Control Panel window on the desktop Close this window by clicking on the X in the upper right hand corner of this window as in Figure 59 2 Ta I dm Rec Control Panel File Edit View Favorites Tools Help Q Back P P Search Folders l ux x 19 EJ Gt g M Address Name Comments Game Controllers Add remove and configure game controller hardware such as joysticks and gamepads ME HCL inetd HCL Inetd Neigl intel Extreme Graphics Control the graphics hardware features of your system HP Internet Options Configure your Internet display and connection settings akeyboard Customize your keyboard settings such as the cursor blink rate and the character repeat rate EB mail Microsoft Outlook Profiles o Mouse Customize your mouse settings such as the button configuration double click speed mouse pointers and motion speed BnetDeploy Launcher Changes settings for the netDeploy Launcher Network Connections Connects to other computers networks and the Internet Be Phone and Modem Options Configure your telephone dialing rules and modem settings ife Power Options Configur
64. lid low going edges into the Two Wire Interface on the PGA309 PC Interface Board The longer the connection wires for SDA and SCL the more the parasitic inductance and capacitance and the larger the injected negative transients become The Two Wire Interface on the PGA309 was intended for local communication between a resident EEPROM or microcontroller and the PGA309 It is recommended that for Temperature calibration setups as illustrated in Figure 46 that the One Wire Interface PRG be used for reliable communications Power Supply T Customer Sensor PC PRG RS232 Vsus Vin e AN PGA309 T GND 10nF GND SDA SDA SCL X SCL EEPROM PGA309 Go PC Interface Board PGA309 Temperature NU d Chamber Sensor Interface Board 40 C lt Temperatue lt 125 C Pressure Input Figure 46 Use One Wire PRG Interface for Temperature Calibration Burr Brown Products fram Texas Instruments Page 50 of 62 10 2 4 Wire Sensor Modules and One Wire Interface PRG When using the PGA309 in a 4 Wire Vs PRG Vout GND Sensor Module Application as shown in Figure 47 there is an optimum way to deal with the PRG pin For minimum component count you can put the required pull up resistor
65. limitations and notices Reproduction of this information with alteration is an unfair and deceptive business practice Tl is not responsible or liable for such altered documentation Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice Tl is not responsible or liable for any such statements Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright O 2004 Texas Instruments Incorporated Burr Brown Products from Texas Instrumonts Page 62 of 62
66. ls File Edit wiew Insert Format Data Window ig 9a irs 3 d w Spelling Help Protection Formula Auditing kl i PGA309 Calibration algorithm The target sensor approximatic Uses 2nd order quadrature equa Kbridge P T ko0 ko1 T Solver RJ Tools on the Web t tu Add Ins n Customize Conditional Sur al Fill out the highlighted cells Pressure values Bmin Pmax 4le 3 oo Lookup oO M hal Temp range Next select the tab in the Options pop up window Click on the Security tab Burr Brown Products fram Texas Instruments Page 4 of 62 View Calculation Edit General Transition Custom Lists Chart Color International Save Error Checking Spelling File encryption settings Far this workbook Password to open Advanced File sharing settings For this workbook Password to modify Read only recommended Digital Signatures Privacy options Remove personal information From this File an save Macro security Adjust the security level Far Files that might contain macro viruses and Macro Security specify names of trusted macro developers omes Click on the Macro Security button Security PR o chat belling Security Advanced Securiby Le
67. n register part checksum Checksum 1 and the temperature coefficient part checksum Checksum2 for the external EEPROM are computed automatically after every change If the box is not checked then the calculations of the checksums may be manually accomplished by pushing the Update Checksums button or entering the checksum values directly from hand calculation The Keep comm alive box when checked reads the Temp ADC register and updates the Main Window reading about every 0 75 second depending upon the operating system used This will prevent the 1s timeout in the PGA309 from expiring thus stopping EEPROM read back updates even if Test Pin is set low The Instant Update box when checked updates the PGA309 Registers immediately after every bit change without having to push the Write PGA309 button Remember that unless Test pin is set high these settings will be overwritten by valid external EEPROM data Keep comm alive Instant Update Autocale Chksum wv Update Checksums Figure 25 Updates Section Burr Brown Products fram Texas Instruments Page 34 of 62 7 9 Board Communication Status The Board Communication Status section see Figure 26 is located in the bottom left corner of the Main Window When reads or write to the PGA309 internal registers or PGA309 external EEPROM are executed messages will appear in this window as confirmation that the communication is taking place successfully EEPROM Lookup Table Bitma
68. nd place this combination in a temperature chamber By controlling the applied pressure to the pressure sensor and the temperature of the temperature chamber the PGA309 Sensor combination can be calibrated for optimum end module accuracy The PGA309 Sensor Interface Board is rated for operation from 40 C to 125 C Power ground output and digital interface wires connect the PGA309 Sensor Interface Board in the temperature chamber to the external PGA309 PC Interface Board The PGA309 PC Interface Board communicates to a test computer through a standard RS 232 serial port via the PGA309EVM PC Cable For USA shipments an AC wall adapter is included to provide 6Vdc to the PGA309 PC Interface Board For all other applications an alternate connection on the PGA309 PC Interface Board is provided for connection to a eVdc 6Vdc 9Vdc lab supply The on board A D Converter ADS1100 on the PGA309 PC Interface Board allows for easy reading of the analog output of the PGA309 The PGA309EVM Software is comprised of two parts The Board Control Software contains all of the interface and control for communication to the PGA309 through the PGA309 PC Interface Board It allows for reading and writing to all registers in the PGA309 as well as reading and writing to the external SOT23 5 EEPROM Both Two Wire and One Wire communication options are available In addition configuration of the PGA309 PC Interface Board and readback of the ADS1100 is provided The PGA309 Cali
69. ndows Media Player i Windows Messenger s W Windows Movie Maker xetingW y Inbox Microsoft O Figure 30 Starting the PGA309 Calculator The PGA309 Calculator software will appear as shown in Figure 29 The program requires that you enter the following information about the PGA309 the reference Vref the sensor excitation Vexc the desired output swing and the power supply voltage Vsa The program also requires that you enter the following information about the sensor the bridge resistance the offset and the span of the sensor Note that if you plan on using the Rt method for temperature measurement you should also enter Rt Also you can choose to enter the full scale output and offset of the sensor rather then the span and offset When all the sensor and PGA309 information is entered press the Compute Constants button to calculate the gain and offset settings for the PGA309 Since there are multiple gain stages in the PGA309 there are many different configurations that can be used to achieve any given gain value For example a gain of 500 can be achieved with Front End PGA Gain 64 Output Amplifier Gain 2 and Gain DAC 0 781 A gain of 500 can also be achieved with Front End PGA Gain 42 67 Output Amplifier Gain 2 4 and Gain DAC 0 976 The algorithm that the calculator uses chooses a gain combination that forces the Gain DAC as close to mid scale as possible Gain DAC 0 667 is ideal The algorithm also cho
70. non linearity The dark blue fields are the ones where the measured values are entered at each stage of the calibration The framed area is filled out when Prepare Calibration Sheet is clicked on the previous page It contains the cells with calculations specific to the chosen calibration algorithm The two control buttons paste in the current worksheet cell either the last Vout reading or the last Temp ADC value from the Board Control Program This saves the manual typing of the numbers However all the data can be also entered manually if the measurements are made with other equipment than the PGA309EVM PC Interface Board F3 Microsoft Excel PGA309 Calibration xls D c Em BOY 58 SF uo r zzi fn 4 100 D Melo c RB 2 SAB X File Edit View Insert Format Tools Data Window Help vi EC gt eSeumity ARL o Arial 0 BIUEZSHB 58 HE 5 5 A Cg fa 3 a Ca vU Aa Q11 m fe A B C D E F G H J K L M N O Tal 1 PGA309 Calibration Algorithm 2 The target sensor approximation equation 3 Uses 2nd order quadrature equations for pressure non linearity and temp drifts of offset and span 4 Kbridge P T ko0 ko1 T ko2 T 2 ko3 p ko4 p 2 1 ko5 T ko6 T 2 5 6 Fill out the highlighted cells PGA309 non variable during calibration settings 7 Pressure values Initial settings of the Fine Adjust DACs Used For Additional Gain Scalins 8 9 10 Pmin Vref V GainDAC1 hex gt
71. nvertion mode of Temperature ADC 1 Continuous 0 Mon continuous requires ADCS 1 EM Internal Temperature Sensor ADC Mode 1 Enable Internal made 0 Disable internal made Instant Update a i 3 i E zDi o M T da EE ADC internal reference 1 Enable 2 0485 typical 0 Disable use external ADC reference see Autocalechksum le One Vyire t V 1 0 Temperature ADC Reference Select WREF v ERC YSA Undate T 1 0 Temperature ADC Input MUX select Select TEMPin GNDA WEXC TEMPin OUT GNDA Y REF TEMPIr E E COM Port 1 0 Temperature ADC Gain Select 1 X2 X4 X8 TEENELISE Setup Board Communcatian Idle TwoAMie C Figure 21 PGA309 Registers Main Window 7 4 PGA Settings Rather than toggling individual bits of the registers described above the PGA309 can be configured using drop down menu selections or check boxes in the PGA Settings section of the Main Window contains Coarse Offset mV FrontEnd PGA Gain V V Zero DAC V Gain DAC V V Output Amp Gain V V Enable Over Under Scale Limits Overscale Limit Underscale Limit Enable Sensor Excitation Linearization Coef V V Enable Internal Vref Vref Value Changing these settings will update the corresponding bits of in the register table and vice versa The current values of these and the PGA309 registers will be automatically updated in the Main Window following a Read PGA309 The current settings displayed in the Main Window will be wri
72. o o Hex 4DCF E Update Vout Settings PGA Interface TwoMre C One Wire Page 19 of 62 6 5 3 Software Board Communication Setup Manual COM Port Setup If on initial software startup the right Com port is not selected automatically then the first screen will look like Figure 9 If you are getting a different error your problem could be related to regional settings More information on regional settings is given in section 10 3 Texas Instruments PGA309 Designer s Kit Control Program ox Fie Edit Board Setup a mona C i Imi 89 us vi Reset Open File Save File Detect Write PGA309 Read PGA309 Write EEPROM Read EEPROM Set PreCal EE PGA Settings ARLE pir SaaS wawi e eile cai iolls Coarse Offset nmi 3482m Enable Intemal ret vw C Meg ter FrontEnd PGA Gain VV gg000 Vef Value aos Click on the register to edit the value and see the details Fault Detection zem DAL v v 313 000m Detect External Faults Gain DAC wh 727 549m Detect Internal Saturation Vout high on external fault Wout high on internal Fault Enable OverUnder S cale Limits v PGA309 Temp ADC Overscale Limit 976 DegC 775 5 degC Underscale Limit 247 508m Dec 12408 Enable Sensor Excitation rJ i VERC 3400 ve n s Convert arization Coet v 0 000 Interface Board and AD5110t Display Mode Binay C Supply Wee E 5 Hex 9 Yok 3 03940 Ier Decimal C d bec pes 7 Jj Hex 4DCF
73. oard positive and negative charge pumps These capacitive charge pumps are noisy and every attempt has been made on the PC Interface board to filter them away from the Vs for the PGA309 However some amount of noise does still exist and as such does not give a true indication of the PGAS309 noise performance on its output Vout After 30 seconds of inactivity on U9 the internal charge pumps are shutdown Easiest check that U9 is in shutdown is to probe TP V for a voltage reading of lt 0 1Vdc To ensure U9 goes into shutdown cease all communications to the PC Interface Board through the RS 232 Interface Ppc and ensure that the Two Wire interface is disabled form the Sensor Interface Board through either software or hardware program selection of disable on U10 and U11 Once U9 is shutdown a quiet reading on Vout of the PGA309 can be taken 6 The on board ADC ADS1100 on the PGA309 PC Interface Board requires two calibration steps for optimal accuracy The gain of the ADS1100 is set by its reference voltage which is the supply Vs Measure Vs on the PGA309 PC Interface Board test point TP Vs Ensure that the nVsens bit in the PCF8574A port expander is set to 0 See Figure 19 ADS1100 and PCF8574A Status and Control Pop up Window to turn Vs on Enter the measured value of Vs into the Supply Vcc V box under the Interface board and ADS1100 in the Main Window After this is complete go to the ADS1100 and PCF8574A Status pop up window
74. on See Figure 29 3 The Pre Cal EEPROM Setup box will pop up Press Generate And Write EEPROM Table 4 A lookup table will be copied into the EEPROM that will force all of the registers including Gain DAC and Offset DAC to your selected values 4 Texas Instruments PGA309 Designer s Kit Control Program PEE i E m 89 us as 4 e e Reset Open File Save File Detect Write PGA309 Read PGA309 Write EEPROM Read EEPR amp M Set PreCal EE PRG pin shorted to Vout PG 309 Test Pin HIGH Pre Cal EEPROM Setup Sle eternal ier Iz After press Ng PGA309 Registers os 4 096 G t d Click on the register to edit the value and see the details eer enera ean Binary ct External Faults W rite EEP RO M ADC Out RO 0x0011 0000 0111 Zero Dac m 3000m ek rte 5 Abram m ZeroDAC 0x0001 0011 1111 high on external fault 7 Table the lookup GainDAC 0x1001 0111 0110 high on intemal faut 0x0000_0101_0000 Gain Dac 09 Temp ADC 0x0011_0111_0000 Cfg2 OverUnder 0x0000_0000_0000 Cfg3 ADC 0x0001 0100 0100 Generate And 12408 ES E Write EEPROM Help OutEnb Counter 0x0000_0000_0000 Table 078 h ADC Conf AlarmStatus RO 0x0000 0000 0000 mum Cu PRS Config Checksum 0x5B64 0x0101 1011 0110 Soames Fm A18 Mn R1 RN RR RR Interface Board and ADS1100 Ref amp Lin Gain Vos Cfg1 table will be updated to force a constant Gain Dac and Zero Dac c2 for PreCal i 0800 13F0 9762 Display
75. onfiguring the Temp ADC then Write EEPROM then set Test pin low for continuous EEPROM reads by the PGA309 with the new Temp ADC settings Vref Value 4 096 m wy Temperature ADC Configuratio m Fault Detection tI Move your mouse cursor over the choices to see Detect External Faults iv corresponding register bits Detect Internal Saturation B Yout high on external fault v Select Signal Source Yout high on internal fault E External TEMPin pin C Apply PGA309 Temp ADC niama hip t et DegC 29 375 degC i nternal on chip temp eer Dec 470 Resolution incl sign i wM il 10b 11b 12b 13b Continuous conv v Hex ADC Config FI Single Shot conv v Convert Enableltemp 7uA F Interface Board and ADS1100 ADC Configuration with External Source Supply Yee Vy 5 0 Enable ADC 2x Turbo ADC Pre gain z Volt 4 04083 1V v ut Ref select Select YN C Dec ADCbuitin2 048v ADC input m gain 4 lins Vref pin 8VN C Lis Board Vexcpin C Update Vout Settings Ysa pin Diff input Reserved C TEMPin GNDa PGA Interface Keep comm alive T Note Bits RV 1 0 do nat VS e TEMPIn C P have effect when the C Vout GNDA Instant Update D 7 built in Vref is selected Vref TEMPin C OneWre Autocalc Chksum v Vout GNDA input is not compatible with the stand alone look up table PGA309 mode Pull Test pin high Update COM Port Checksums Setup Figure 22 PGA309
76. oses the larges possible Front End PGA Gain to minimize noise A similar algorithm is used for offset in that the Coarse Offset is selected to set the Offset DAC to mid scale Setting the Offset and Gain DAC to mid scale allows for the maximum PGA309 adjustment range to compensate for sensor drift Burr Brown Products fram Taxas Instruments Page 37 of 62 In cases where you want more control over gain and offset selection you can force the Front End Gain and or Coarse Offset to a fixed value using the Set Additional Constraints The Set Additional Constraints feature can be especially useful if you want to minimize the Coarse Offset Setting See Figure 31 The Coarse Offset feature on the PGA309 uses an auto zero topology Noise introduced by the auto zero technique can be minimized by using the minimum required coarse offset Thus if you don t need the full offset adjustment range you can use the Set Additional Constraints feature to select a minimum value of Coarse Offset 48 PGA309 Calculator Rev 1 4 2 Reference Select Sensor Output f Normalized Sensor Data Iw Enable Internal Vret Ref Val 4 096 PGA309 Offset in We Settings for your design Span in WA Bridge Excitation Min 32182m Results computed by software for gain and offset on the PGA309 Bridge Resistance Hbridge Calculated FGA Settings Coarse Offset mV
77. p of a register Board Cammuncatian Idle Jp nica Figure 26 Board Communication Status Section 7 10 Miscellaneous Main Window Boxes In the upper left corner of the Main Window under the Top Row Control Buttons there are two check boxes as shown in Figure 27 PGA309 Test Pin High if checked will put a logic high on the Test pin See Table 6 for the description of the Test pin function LED D2 on the PGA309 PC Interface Board will be lit whenever this box is checked Logic High If the PGA309 is to be configured with its PRG pin tied to Vout then the box labeled PRG pin shorted to Vout see Figure 27 must be checked for reliable operation With this box checked the Board Control Software will cycle power on the PGA309 each time it tries to communicate with PGA309 over One Wire interface to ensure that Vout is in high impedance on the PGA309 during the first 25ms after power up C zm s ay B Reset Open File Save File Detect write PASO PRG pin shorted to Vout FPGA309 Test Pin HIGH Figure 27 Miscellaneous Main Window Boxes 7 11 Calibration Without Using the Test Pin 3 Wire Modules In many cases the PGA309 is connected in a configuration referred to as a three wire configuration In this configuration the only wires that need to connect to the sensor module are power ground and Vout In this configuration the one wire digital communication line is connected to the Vout pin When the PGA309 is init
78. ptions pop up window Burr Brown Products from Tazas Instruments Page 54 of 62 Step 5 In the Language for non Unicode Programs section click on the drop down menu arrow and select English United States as shown in Figure 53 If your computer is already configured for English United otates as the Language for non Unicode Programs skip to Step 7 i Regional and Language Options Regional Options Languages Advanced Language for non Unicode programs This system setting enables non Unicode programs to display menus and dialogs in their native language It does not affect Unicode programs but it does apply to all users of this computer Select a language to match the lanquage version of the non Unicode programs you want to use Enal English Zimbabwe Estonian Faeroese Finnish French Switzerland FYRO Macedonian Galician German Austria German Germany German Liechtenstein German Luxembourg German Switzerland Greek Hungarian ern Italian Italy a2 a talian Switzerland Japanese Figure 53 Language for non Unicode Programs selection Step 6 Now click on Apply You will be queried to restart your computer Restart your computer and repeat otep 1 and Step 2 above and then continue on with Step 7 hortcut to Shortcut to PeoplePC Shortcut to Shortcut to i Regional and Language Options Ht Regional Options Languages amp dvanced Language for non Unicode programs This
79. rated Lookup Table pel 2 Reg Addr Name Binary value Position Temp ZM GM 0 ADC Out RO 0000 0001 1001 0111 1 ZeroDAC 0000 1010 0011 1101 2 GainDAC 1001 1001 1001 1001 3 Ref amp Lin 0000 0101 0000 0000 5 Cfg2 OverUnder 30000 0000 0000 0000 6 Cfg3 ADC 0001 0000 0000 0000 T OutEnbl Counter 0000 0000 0000 0000 8 AlarmStatus RO 0000 0000 0000 0000 Config Checksum 0110 1111 1011 0110 Load Registers from File Load Registers From PGA309 Prepare Calibration Sheet Save Registers _ookup Table 27 PGA309DK Calibration Spreadsheet 28 Version 1 1 0 29 2004 Texas Instruments 30 pur 31 M MMain Sensor Curvefit Calibration Results Template Rt2 Template Not Rt Template Rt Template Not Rt2 T miim Draw s AutoShapesy a O A 2 2 A S FBa Ready NUM LEE I 4 Gain Vos Cfg1 0011 0111 0000 0000 oman name Co h5 c ERTE LET EL EL ELE LEE TEE UE GM WEE LEE GI LEE I GI Figure 34 Main Worksheet Burr Brown Products ris denis Page 41 of 62 2 The Sensor Curvefit Worksheet Figure 35 is the place where all results of the calibration measurements are entered and the sensor compensation coefficients are calculated The fields colored light blue contain pre selected values such as PGA309 Gain and Offset settings the temperatures where the measurements are made and sensor pre characterized parameters such as span drift
80. rd to an RS 232 serial port on the Test Computer AC Outlet 6Vdc Supply 6eVdc 9Vdc 200m OR 120Vac RMS 60Hz N USA Only Lab AC Wall Adapter supply Y IN 120Vac RMS 60Hz OUT 6Vdc 200mA PGA309 Designer s Kit QE Software PGA309 PGA309 rT Sensor Interface PC Interface A Board Board Test Computer Figure 5 Hardware Setup Initial Checkout 6 4 Board Control Software Installation 1 The PGA309EVM Board Control Software is installed in the normal Microsoft Windows manner Close all other applications From Start button on the task bar select Run 2 In the Run Window type d setup where d is the letter designation of the CD ROM drive containing the PGA309EVM Software CD ROM 3 Follow the on screen prompts to install the software 4 To remove the PGA309EVM application use the Windows Control Panel utility Add Remove Software 6 5 Software Hardware Initial Checkout At this point no LEDs should be lit on the PGA309 PC Interface Board If any LEDs are lit cycle the power on the PGA309 PC Interface Board Burr Brown Products from Texas Instrumonts Page 16 of 62 6 5 1 Software Startup Start the PGA309EVM Board Control Software by clicking on PGA309 DK Board Interface under the Start menu All Programs PGA309 Designer s Kit as shown in Figure 6 e Recycle Bin gt Calibration Spreadsheet 4 PGA309 DK Board Interface 3 PGA309 DK Board Interface ao DESKTOP INI ITE
81. re level for sensitivity Since the min and max pressure levels for the sensitivity can be combined with zero and span measurements this reduces the total number to 7 measurements zero half full scale at one of the temperatures zero and full scale at each of two other temperatures This is called the 3 temperature 3 pressure calibration oince over temperature calibration in an oven is often a lengthy and expensive process it is often preferred to characterize the span and offset drift non linearities on some number of sensor samples and avoid using the 3 temperature test in production In this case if we know that the sensor exhibits for example 996 span drift non linearity over the full temperature range and we measure only two points on this curve we can find the equation coefficients The same is true for offset drift and pressure non linearity By using this pre characterization method we can reduce the number of required measurements to 2 temperature points with 2 pressure levels at each 2 temperature 2 pressure calibration In cases when the pressure non linearity is not known due to bridge resistor value mismatch or other reasons three pressure levels need to be measured at one of these temperatures 2 temperature 3 pressure calibration The PGA309 Calibration Spreadsheet includes templates for each of the three methods described above The exact equations for curve fitting the sensor are not included in this document but c
82. rete er RTI Kbrg wh VoutMeas 25 20 0 LI RATED 26 20 i 50 1 80E 03 27 20 100 3 54E 03 28 29 85 i 0 5 88E 05 30 85 i 100 3 54E 03 31 32 40 E 0 B8E 05 33 40 100 3 54803 Figure 42 Entering the Values for Tmeas1 and Vout Tmeas1 4 For the example shown highlight the cell C25 VoutMeas Pmin Tmeas1 and click the button Insert Vout Reading or enter the measured voltage by hand Figure 40 The example shown is for three pressures three temperature calibration Other calibrations are done in a similar manner but the number of readings required and the cells used will differ 5 Repeat Step 4 for measuring the max scale C27 and if needed mid scale C26 Vout values Burr Brown Products from Tazas Instruments Page 46 of 62 6 Place the Sensor PGA309 at the temperature Tmeas2 and repeat the Steps 3 4 5 entering the values to the corresponding cells below the ones shown in Figure 40 At each stage make sure the signal path of the PGA309 is not overloaded by reading the state of the Alarm Register 7 If using the 2 Temperature 3 Pressures or 2 Temperature 2 Pressures algorithms enter the second order parameter non linearities of the sensor in the highlighted cells B33 B36 8 Verify that the resulting fitted sensor approximation Figure 36 are in agreement with the characterization data 9 Go to the next Worksheet Calibration Results and enter the desired ou
83. robat Reader 5 1 DESKTOP INI Internet Explorer P Microsoft Access 2000 Microsoft Excel e Microsoft Outlook Microsoft PowerPoint Microsoft Visio Microsoft Word Ww MSN Explorer NetMeeting S Outlook Express i PeoplePC Online e Remote Assistance S Solution Center Texas Instruments ESP 2 Figure 6 PGA309EVM Board Control Software Startup Burr Brown Products from Texas Ingtrumants Page 17 of 62 6 5 2 Software Board Communication Setup Default On initial software startup a Main Window will appear with a smaller pop up window in the middle of the Main Window Click Yes on the pop up window see Figure 7 If the initial software startup does not look like Figure 7 then proceed directly to Section 6 5 3 49 Texas Instruments PGA309 Designer s Kit Control Program C zx m E us a 9 9 9 Reset Open File Save File Detect Write PGA309 Read PGA309 Write EEPROM Read EEPROM Set PreCal EE E PGA Settings PRG pin shorted to Vout PGA309 Test Pin HIGH Sesion Utes tall oo gt sb PGA309 Registers 5 0 Click on the register to edit the value and see the details Ais Eod e SEINE LI 4 000 if EE Fault Detection zero DAC v ul Detect External Faults ADC Out RO Ox0000 Ox0000_0000_0000_0000 Gain DAC V v 333 333m Detect Internal Saturation fF eroDAc Ox0000 0000 0000 0000 Vout high an external Fault Output Amp Gain V V 2 000 GainDAc Ox0000_ 0000 _0000_0000 Vout
84. roblem On some European Computers when the PGA309DK Control Software is started an error is reported as illustrated in Figure 48 X53 TEXAS c 2004 Texas Instruments Inc INSTRUMENTS ee SEEN cabtruments Run time error 13 PGA309 Des Board Control P Version 1 1 2 Type mismatch Figure 48 Run time error from PGA309DK Software Cause This error Runtime Error 13 Type Mismatch Error is usually caused by the decimal representation of non English language computers which use a comma instead of a period for the decimal separator i e 100 89 represented as 100 89 Solution The solution involves regional settings changes in two different places on the User s Computer For Windows XP or NT you must be logged on as an Administrator or a Member of the Administrators Group in order to complete this procedure Step1 From the Windows Start Menu select and click on Control Panel oee Figure 49 The Control Panel will open in a new window as shown in Figure 50 Burr Brown Products fram Taxas Instruments Page 52 of 62 a086 7024 Ww MSN Explorer P3 My Documents MSN Explorer E p CJ My Recent Documents gt Q Windows Explorer gt Launch Microsoft Outlook PGA309 DK Tina a My Network Places Shortcut to visio exe g Control Panel Shortcut to EXCEL EXE Set Program Access and Shortcut to WINWORD EXE Defaults a Notepad Connect To I5 Adobe Reader 6 0
85. rototype this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive Should this evaluation kit not meet the specifications indicated in the PGA309EVM User s Manual the kit may be returned within 30 days from the date of delivery for a full refund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE The user assumes all responsibility and liability for proper and safe handling of the goods Further the user indemnifies TI from all claims arising from the handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES TI currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive Tl assumes no liability for applications assistance customer product design software performance or infringement of
86. rt Setup 6 5 4 Hardware Checkout 1 In the Main Window click on Open File A pop up window will appear as in Figure 12 Look in O PGA309 Designer s Kit ek g LJ B PGA309_DK_Test txt Recent 3 Desktop D My Documents My Computer a File name PGA309 DK Testt My Network Files of type Text tst Cancel Places Open as read only Figure 12 Open File Pop up Window Burr Brown Products fram Taxas Instruments Page 21 of 62 2 Select PGA309 DK Test txt and open this file located in the PGA309EVM Software directory typically C Program Files PGA309 Designer s Kit A pop up window will appear as in Figure 13 Click on OK The File Program Files Po4309 Designer s Kit P3098 DK Test txt has been succesfully loaded OK Figure 13 Open File Acknowledge Pop up Window The Main window will appear as in Figure 14 Texas Instruments PGA309 Designer s Kit Control Program ERES File Edit Board Setup D z F ed os at e 9 9 Reset Open File Save File Detect Write PGA309 Read PGA309 Write EEPROM Read EEPROM Set PreCal EE z 7 j PGA Settings PRG pin shorted to Vout PGA309 Test Pin HIGH P Coarse Offset mV sem sEnabis fniemal P PGA309 Registers 4 096 Click on the register to edit the value and see the details Tegep ae Ea 64 000 M p Fault Detection Zero DAC V 00 000 Detect External Faults ADC Out RO 0x0186 0x0000_0001_1000_0110 Gain DAC V V 9
87. s It is recommended to have PRG wire connected on the PGA309 Sensor Board even when using Two Wire communication The Board Control Software addresses PGA309 using One Wire interface prior to closing the switches U10 U11 This stops any activity by the PGA309 on the Two Wire interface for 1 second and prevents any bus conflicts By pushing the COM Port Setup button a pop up COM Port Setup window will appear in the Main Window In the pop up window the desired interface may also be selected as well as which PC COM port Port will be used and the Baud Rate Baud Rate for Communication through the selected COM Port Drop down menus are used to select both the desired COM Port and Baud Rate Once the interface is selected it may be tested by pushing the Apply Detect button or by pushing the OK button in the pop up window LEC 26478 Hex eree Ue COM Port Setup m Board Update Vout EE Settings Select Serial Port Interface Port H COMT wire C Keep comm alive POA nterface i Toii Lj Baud Rate 49200 Wie i Instant Update TwvaANire Autocalc Chksum w Apply Detect Cancel Update COM Port Checksums Setup Figure 24 Interface Section and COM Port Setup Pop up Window One Wire 7 9 Updates The Updates section see Figure 25 in the Main Window provides options for how certain calculations and readings in the Main Window are updated If the Autocalc Chksum box is checked then both the configuratio
88. s and the Table is arranged properly The plot on the bottom shows the expected PGA309 output vs temperature at zero and full scale output signal Ed Microsoft Excel Copy 3 of PGA309 Calibration xls a mi x File Edit View Insert Format Tools Data Window Help Acrobat 2 18 x DOSES G6RY 4 BRS oo SrA Mem G 6 5 Brgsz A m EB x 50 Mr Leni EE Se ee EE m I i en Eee ES SSE Ee E B Ee Sle ee E G R P 1_ PGA309 Desired output and its look up table 2 Lookup Table Parameters Resulting Look up Table 3 Enter Output Scale of points Point Temp Gfine V v GainSlope Vzero V ZeroSlops Temp zM GM 4 Vout ma v Memp iF 50 0 681061 0 3552442 5 Vout min Y Optional 0 688211 0 000572 0 3484514 0 000543 FB32 gx LUT_Tming 50 degC 0 695514 0 000584 0 3416586 0 000543 FESC 7 LUT_Tmax degC 12 5 0 702373 0 000537 03348658 0 000543 0185 8 0 710593 0 00061 0 3280731 0 000543 O4 AF 0 718381 0 000623 0 3212803 0 000543 O07 D9 0 726341 0 000637 03144975 0 000543 O0BO2 0 73448 0 000651 0 307634 0 000543 OE2C 0 742803 0 000666 0 3003013 0 000543 1156 0 751317 0 000681 0 294092 0 000543 1450 0 760028 0 000637 0 28973164 0 000543 17 3 0 768344 0 000713 0 2805236 0 000543 1AD3 0 778071 0 00073 02737308 0 000543 1DFD 0 787418 0 000748 0 266338 0 000543 2126 0 736332 0 000766 0 2601453 0 000543 2450 0 806801 0 000785 02
89. s are relative to PC Master Burr Brown Products from Texas Instruments Page 12 of 62 R21 20002 1206 MMBD4148 R18 4 7kQ Med fe VW R19 4 7kQ C23 One Wire Speedup SN74LVC1G66 D5 MMBD4148 D6 MMBD4148 LMV331 SOT23 5 Vs Vv C24 220pF V E R24 18 2kO SN74LV221A TSSOP 16 1206 SN74LVC1G66 TPU lt 5us typ PGA309 PC Interface Board Schematic Sheet 2 of 2 Burr Brown Products from Texas Instruments Page 13 of 62 6 0 Initial Setup and Checkout 6 1 PGA309 Sensor Interface Board Factory Jumper Settings Confirm and or set the jumpers on the PGA309 Sensor Interface Board as shown in Figure 3 The desired jumper settings are also described in Table 1 PGA3OS Sensor Interface Board o Burr Brounm Products from Texas Instruments J5 Uexc 10 Bridge Shor t LI J4 Jtest exc LI O Uini Bridge p3 E eim s J3 C Test c5 Test orl m L su z l LINOIS std ert USL Eg Figure 3 PGA309 Sensor Interface Board Factory Jumper Settings Jumper X Position Ah CI c I Co h5 C Icc c 9 c Co J Table 1 PGA309 Sensor Interface Board Factory Jumper
90. s assumes Vcc will become the Vs for the PGA309 Sensor Interface Board For further ADS1100 details consult the ADS1100 data sheet Burr Brown Products fram Taxas Instruments Page 32 of 62 Logic Description Comments State P7 PGA309 operates in Normal Stand Reads external EEPROM and uses Test pin Alone Mode temperature coefficients to update Gain DAC and Zero DAC settings 1 PGA309 operates in Test Mode No external EEPROM reads and must be manually written to for changes in DACs or register settings NL 2 LED D2 is turned on by the Board Control Interface Board Software if PGA309 Test Pin HIGH box in the Main Window is checked Turns off LED D2 on PGA309 PC LED D2 is turned off by the Board Control Interface Board Software if PGA309 Test Pin HIGH box in the Main Window is not checked Oo Jg o Software when successful communication has Interface Board been completed after power on from zero volts on the PC Interface Board 1 Turns on LED D1 on PGA309 PC LED D1 is turned on by the Board Control 1 Turns off LED D1 on PGA309 PC nLED1 Interface Board P Normal ADSt100inputoperation ADS1100 1 Shorts ADS1100 inputs Vin and Vin Cal together for offset calibration the Board Control Program Logic output of port expander port P3 Spare port expander port available for user 1 PGA309 PC Interface Board U5 application if desired pin 7 Disables the Two Wire interface from
91. ter Board Communcation Idle Communication Status Figure 17 Main Window Burr Brown Products fram Taxas Instruments Page 26 of 62 7 1 Top Row Control Buttons The Top Row Control Buttons are described in Table 5 Button Name Reset Resets all register bit values to zero Open File Selects File to open which contains saved EEPROM Configuration Register and Lookup Table values Save File Selects File to save current EEPROM Configuration Register and Lookup Table values Looks for PGA309EVM Boards using current Port Setup Configures the board and read the current Register and the Lookup Table values Writes all current Main Window values into PGA309 R W Registers including setting ZeroDAC and GainDAC Detect Write PGA309 Head PGA309 Write EEPROM Writes current values in the Lookup Table section and PGA309 Register section of the Main Window into external PGA309 EEPROM Head EEPROM Table 5 Main Window Top Row Control Buttons Reads all current PGA309 Register values into the Main Window Reads external PGA309 EEPROM values into Main Window Description Comments See Related Figure Resets values in PC memory only Requires a Write to PGA or Write to EEPROM to effect Figure 18 Figure 18 Both PGA309 Sensor Interface and PGA309 PC Interface must be present and working Unless Test Pin is set high these settings will be overwritten by valid external EEPROM
92. the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are used to the extent Tl deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed TI assumes no liability for applications assistance or customer product design Customers are responsible for their products and applications using Tl components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards TI does not warrant or represent that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in which TI products or services are used Information published by TI regarding third party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in Tl data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties conditions
93. ting System Compatibility The Calibration Spreadsheet runs on the English version of Microsoft Excel versions 2000 XP 2003 Also the regional settings should be set to English United States with the decimal symbol set to a period More information on issues related to changing regional settings is given in section 10 3 Consult factory for other versions Ensure that the Excel Analysis Toolpack is enabled Click on Tools and then click on Add Ins E Microsoft Excel Book1 Fille Edit View Insert Format Tools Data Window Help Ps z a Ne Spelling Protection Formula Auditing Solver Tools on the Web Customize Options Conditional Sum Lookup Ensure that the Analysis ToolPak box is checked in the Add Ins pop up window Click on OK in the Add Ins pop up window Burr Brown Products fram Taxas Instruments Page 3 of 62 Add ins Add Ins available Y v Analysis ToolPak YBA v Conditional Sum Wizard Euro Currency Tools Internet Assistant VBA Iv Lookup Wizard v Macro Systems Add ins Manager 2 I Solver Add in Automation v Visual Basic Macros Made Easy Cancel Browse E Analysis ToolPak Provides functions and interfaces for financial and scientific data analysis In addition you will need to allow Macros to run in Excel Click on Tools and then click on Options EJ Microsoft Excel PGA309 Calibration x
94. tion 1 Location 0 PGA309 External EEPROM Second Part Temperature Coefficients 8 4 2 1 8 4 2 1 8 4 2 1 8 4 2 1 Upper Byte Lower Byte External EEPROM Address Decimal Data D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 DO Hex Eq 17 16 TO Temperature Index Value MSB LSB for Temp TO 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0800 19 18 ZO Zero DAC value for Temp MSB LSB TO 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 0640 21 20 GO Gain DAC value for MSB LSB Temp TO 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 FFEF 23 22 Tenp MSB LSB End of Look up Table 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 7FFF 25 24 ZMenp MSB LSB End of Look up Table 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 SUM 18E3E 27 26 FFFF sum Hex Eq of each location MSB LSB 17 16 thru 25 24 truncated above 16 bits GMgyp Checksum2 1 0 1 0 0 0 1 0 0 0 1 0 1 0 1 1 71C4 Burr Brown Products from Texas Insirumanty Page 60 of 62 PGAS309EVM IMPORTANT NOTICE Texas Instruments Tl provides the enclosed product s under the following conditions This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONL Y and is not considered by TI to be fit for commercial use As such the goods being provided may not be complete in terms of required design marketing and or manufacturing related protective considerations including product safety measures typically found in the end product incorporating the goods As a p
95. tor Calibration QuickTime EXCEL EXE Spreadsheet Player E NE NINE Hi L Hi Adobe Reader Notepad My Computer Shortcut to PeoplePC 6 0 Customer Visit Accelerated Figure 59 Control Panel window Step 8 Start the PGA309DK Control Software Now all features of PGA309DK Software should be working correctly Burr Brown Products from Texas Instruments Page 58 of 62 11 0 PGAS309EVM PC Cable Drawing BACKSHELL 1 CABLE 1 z S NC Grey Orange MEM Y s Black 3 OO T e f Red ZEE ME 4 co e M oe Green Yellow 22 1 6 Bie m y ro NS aus os Brown Jl B v J CONNECTOR 1 DB9 Female RJ45 Plug Cable Back side Solder Cup Ridge Down View 1 No Connection 2 RD 3 TD 4 DTR SG PGA309 EVM 6 DSR PC Cable Drawing 7 RTS 8 CTS THG January 16 2004 9 No Connection CABLE 1 Grey Orange Black mmm Black Red Green Yellow Blue Brown RJ45 Plug w Cable 8 Conductor Modular Cable EEE Orange a Green Burr Brown Products from Texas Ingtrumants N 8 rs OSEE Page 59 of 62 12 0 PGA309EVM External EEPROM Settings for Functional Test 8 Bit EEPROM Load gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt Location 1 Location 0 PGA309 External EEPROM First Part Configur
96. tput voltage scale in the cells B4 B5 the number of the Lookup Table points in the cell E4 and the temperature range where the calibrated output signal is expected in cells E6 E7 see Figure 43 Note that this can be a narrower range than the Tmin Tmax range used for the sensor curve fitting Using a smaller temp range will reduce the spacing between the points on the piece wise linear PWL gain and offset curves generated by PGA309 This in turn will reduce the residual 3 order errors of the output The resulting lookup table and the simulated plot at the bottom of the page get instantly updated The plot axes might have to be adjusted to display the curves properly Pay attention to the Result Sanity Check messages in the cells B11 B13 If the required DAC or ADC values are outside of the linear ranges of the PGA309 the message will inform you about it This means that the coarse parameters of the PGA309 must be adjusted and the calibration has to be repeated PGA309 Desired output and its look up table Lookup Table Parameters Resulting Look up Table Look up table Hex Enter Output Scale of points Point Temp Gfine V V GainSlope Vzero V ZeroSlope Temp ZM Vout max V Ntemp 0 703735 0 286542 F808 11E9 Vout min V Optional 5 0 706215 0 000198 0 29596 0 000753 FB32 002F LUT Tmin degC LUT Tmax degC 0 709357 0 000251 0 303348 0 000591 FE5C 0026 5 0 713177 0 000306 0 308706 0 000429 0185 001B 0 717697 0 000362 0
97. tten to the PGA309 internal registers following a Write PGA309 or to the external PGA309 EEPROM following a Write EEPROM If the Instant Update check box in the lower right of the Main Window is checked then the PGA309 internal registers will automatically be updated after every change Remember if you do not want the register settings in the PGA309 to be over written by valid PGA309 external EEPROM data then ensure the PGA309 Test pin is set high by checking the PGA309 Test Pin HIGH box in the upper left area of the Main Window Burr Brown Products fram Taxas Instruments Page 30 of 62 7 5 Fault Detection In the Fault Detection section of the Main Window the following check boxes are provided for fault detection configuration Detect External Faults checked means enable detection of external faults Detect Internal Faults checked means enable detection o internal faults Vout high on external fault unchecked means Vout low on external fault Vout high on internal fault unchecked means Vout low on internal fault The current settings of these in the PGA309 registers will be automatically updated in the Main Window following a Read PGA309 The current settings displayed in the Main Window will be written to the PGA309 internal registers following a Write PGA309 or to the external PGA309 EEPROM following a Write EEPROM If the Instant Update check box in the lower right of the Main Window is checked then the PGA3
98. vel Trusted Sources C High Only signed macros from trusted sources will be allowed bo run Unsigned macros are automatically disabled f Medium You can choose whether or not to run potentially unsafe macros ie Low nat recommended You are not protected From potentially unsafe macros Use this setting only iF you have virus scanning software installed ar you are sure all RRRRRRR PEE EEE eee See Lee eee LeeLee EEE eee Macro Security Cancel No virus scanner installed canes Burr Brown Products fram Taxas Instruments Page 5 of 62 In the Security pop up window under the Security Level tab select either Low or Medium Click on OK in the Security pop up window and also on OK in the Options pop up window 2 0 Description The PGA309EVM key hardware consists of two boards see Figure 1 PGA309 Sensor Interface Board and PGA309 PC Interface Board The PGA309 Sensor Interface Board contains the PGA309 external SOT23 5 EEPROM and several jumpers for ease of bridge sensor configuration The PGAS309 PC Interface Board contains an RS 232 serial interface a 3V 5V programmable linear regulator a switch for power control to the PGA309 Sensor Interface Board both One Wire and Two Wire interface configuration and control logic and an A D Converter ADS1100 The PGA309EVM is designed to allow the user to attach his sensor to the PGA309 Sensor Interface Board a
99. xtraGain and ExtraOffset fields are used if an external amplifier is used to scale the output of the PGA309 If an external scaling amplifier is not used ExtraGain should be ___ Set to 1 and ExtraOffset should be set to zero This is the default settings Fill out the highlighted cells PGA309 non variable during calibration settings Pressure values Initial settings of the Fine Adjust DACs Used For Additional Gain Scalin Pmin Vref V GainDAC1 hex gt gt 0 6667 V V ExtraGain Pmax Kexc VN ZeroDAC1 hex gt gt 2 5000 V ExtraOffset FrontEnd PGA VN Temp range Output Amp VN Temperature ADC Settings Used For Rt Calc Only Tmin Coarse Offset V Rt Leave this cell blank Rt is not used in this configuration Tmax No of Bits Troom Vexc 5 000 V with LinDAC 0 AdcGain AdcVref z ee Bridge sensitivit Figure 41 Top Part of the Curvefit Worksheet 3 On the Sensor Curvefit Worksheet highlight the cell C18 ADC read Tmeas1 and click the button Insert Temp ADC Reading Figure 42 Step 3 15 Insert TempADC reading in active cell Insert Vout reading in activ e 16 AE 17 Measurement Temperatures 18 Imeasi B this Temp 3 pressure levels are 19 Imeas 2 20 Tmeas3 21 22 Measured Data assuming the sensor directly Post First Cal Co 23 Measurement Conditions Measured Data RTISpan V V T 24 Temp Pressure

PGA309EVM User`s Guide (Rev. D

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