Evaluation Board User Guide
Contents
1. SOCKetS E EE Noise a E Using Absolute Reference Connecting the AD7195 to an External Microcontroller Using the AD7195 Evaluation Board in Standalone Mode Evaluation Board Software ccccsscccssscscsssscscsssscscssssssssssscsssssssseess REVISION HISTORY 5 11 Revision 0 Initial Version Software Installation 0 sessesssseseeceessseeeseescseeseseeecaeeeeneeeeneeeeaees 6 Installing the Evaluation Software 6 Configuring the Evaluation 6 Using the Software scissa 6 Main 7 ADC Setup Window 8 Configuration Assist TOO tesesessessseseeseeseesssseesseseeseeneeneeseess 9 Low Nois Quick 10 Weigh Scale 11 User 12 Evaluation Board Schematics and 13 Ordering Information 17 Bill of Materials Nae eee RE ees 17 Rev 0 Page 2 of 20 EVALUATION BOARD HARDWARE POWER SUPPLIES There are several power supply options on the AD7195 evaluation board Connected to USB Connector When the USB connector is used the AD7195 e2. 104 anyo anro anro aro anyo nny 199 7099 So 59 89 pay 16031 7 8 153 D gt 5655555 2 AStIxa 1 yeu 4 1 4815 Poe YOLINOW SNOLING 7 1 9 A 3119159 5g _ _ er 1931 amp yy wav Ms edd ey e a O1ds 2dd 57 aai 52 5 055 z0 oF 548 55 SNOLLNG ASH 5 10X79 S91S 0704 LYd ZS 76 Ov 8155898 9 SF 15 913 LSO a TE buavodl4 Svd 4 7 ONAS 709 13534 1 210 301S ZWd 10S Sica wet OINI OVd so lt 5 044 10899LA9 ae _ zed ONG eas 392 1 104 49 oz 1 90 823 259 904 989 2149 Az S04 Sad on 22 1 01 1 zou gsn uw mi if H aol _ eq unix 105 189 004 084 AS 001 LSIWLX _ CRETE ae A a gt 98 t snaa amp 1 6 5555555 5 91 a a 1545 59202 11045 999909090
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4. Figure 17 AD7195 Evaluation Board Silkscreen Rev 0 Page 15 of 20 UG 257 OO a Figure 18 7195 Evaluation Board Solder Side View Rev 0 Page 16 of 20 09727 018 ORDERING INFORMATION UG 257 BILL OF MATERIALS Table 2 Qty Designator Description Manufacturer Supplier Order No 1 U1 AD7195 Analog Devices AD7195BCPZ 1 U2 ADR421 reference Analog Devices ADR421BRZ 1 U31 5 V voltage regulator Analog Devices ADP3303ARZ 5 1 U32 3 3 V voltage regulator Analog Devices ADP3303ARZ 3 3 1 U50 10 64 step digipot Analog Devices AD5258BRMZ10 1 U51 USB controller Cypress Semiconductor CY7C68013A 56LFXC 1 U52 64K EEPROM Microchip Technology Inc 24LC64 I SN 1 U53 LCD connector 76341 308LF 4 LED1 to LED3 LED51 LED red high intensity gt 90 mcd 0603 Avago Technology HSMC C191 5 LED4 to LED8 LED green high intensity gt 50 mcd 0603 Avago Technology HSME C191 XTAL1 4 9152 MHz crystal Not inserted 1 XTAL51 24 MHz crystal AVX CX5032GB24000HOPESZZ 1 D1 Diode ON Semiconductor P6SMB6 8AT3G 4 D31 to D34 Diode Philips BAT721C 1 Q51 N MOSFET Infineon BSS138N 9 C1 to C7 C15 C16 Capacitor ceramic Not inserted 2 C52 C53 12 pF ceramic capacitor Phycomp 2238 867 15129 4 C8 C10 C11 C13 0 01 uF ceramic capacitor Phycomp 2238 586 15636 17 C19 to C24 C31 to C33 0 1 uF ceramic capacitor Phycomp 2238 786 15649 C5
5. 28 99 ay JY 1 UD 10 A osjo OGY UNIV 5 MN t 153 JSION 5 A A A aliies SJOV4AYSLNI 1535 L s4 1 919 52 lt ao 58 WOONIV LNIV MIOW 10 9 7 72012 Es 9 5 1 L adAY S6LLQV K Buldkyoyoud 20 159 Figure 14 AD7195 Evaluation Board Schematic Analog Rev 0 Page 13 of 20 UG 257 710 22260
6. 0 Page 19 of 20 00 257 NOTES ESD Caution ESD electrostatic discharge sensitive device Charged devices circuit boards can discharge without detection Although this product features patented or proprietary protection Aviad circuitry damage may occur on devices subjected to high energy ESD Therefore proper ESD precautions should be taken to avoid performance degradation or loss of functionality Legal Terms and Conditions By using the evaluation board discussed herein together with any tools components documentation or support materials the Evaluation Board you are agreeing to be bound by the terms and conditions set forth below Agreement unless you have purchased the Evaluation Board in which case the Analog Devices Standard Terms and Conditions of Sale shall govern Do not use the Evaluation Board until you have read and agreed to the Agreement Your use of the Evaluation Board shall signify your acceptance of the Agreement This Agreement is made by and between you Customer and Analog Devices Inc ADI with its principal place of business at One Technology Way Norwood 02062 USA Subject to the terms and conditions of the Agreement ADI hereby grants to Customer a free limited personal temporary non exclusive non sublicensable non transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY Customer understands and agrees that the Evaluation Board is provided for
7. i 79377 hos asots 157 be om lt om vas 959 294 zy He anyo e aav 719 9 128 Wr 552 6 NAVV ree sys 058 AEE ACE zsr ACE Zen ACE 8625 0 osn 6ngep 201 JOV4YSLNI 8SN YATIOYLNOOD 8SN al 85 5 33 LSVYLNOD 031 doup 104 21 20 010 95 veg as a01 6 gt 212118 5 BULLY T 32015100 A6 18 A94 2124178 ATI 9 4 0 9 aya ono ano zed Any 9 aaa No anro 089 TF 5 E zoo seo 920 159 Net IVE t HNI 100 HN 100 5 e 170 eea 100 0 IEN _ _ aor 4 Age soeedav ZEN T RGF IEY astasn ier 6 1 21 41 8 JYNOS 9 YOLVINDAY ayy AS GSN Sex0W 1 5 AL S Figure 15 AD7195 Evaluation Board Schematic Digital Rev 0 Page 14 of 20 UG 257 T a E oc gt e
8. frequency must be entered in the MHz text box Voltage Reference The reference source and reference value are programmed in this section The user can enable disable the reference detect function and set the voltage of the reference When the reference setup is changed the changes needed to the Configuration Register are shown in the Registers HEX section Rev 0 Page 8 of 20 Excitation Mode Use this drop down menu to select ac excitation dc excitation Bridge Power Down Switch The low side power switch is enabled or disabled using this drop down menu Mode of Operation This drop down menu allows the user to select different modes of operation such as continuous conversion single cycle conversion and calibration Output Data Format This drop down menu allows the user to select the output format of the data conversions and to enable the parity When several analog inputs are enabled the Data Status feature should be enabled Registers HEX This section displays the values to be written to the AD7195 registers When features such as the analog input channel gain and mode of operation are changed the values in the Registers HEX section are updated automatically The user can write directly to the Registers HEX section altering the contents of any register The sections such as Analog Inputs and Digital Filter are updated to reflect the changes in the Registers HEX section UG 257 CONFIGURATION ASS
9. links J2 and 23 all positions CANCEL ree In this setup the ADC analog power supply is GV voltage reference 5V inputs AIN1 and 2142 are shorted together and biased to approximately 2 6V P Low Nome Quick Test ADC Setup CANCEL rer This is the last step of the Low Noise Quick Test setup If you click the OK button now the ADC will automatically be setup as follows Analog Input AIN1 AIN2 Gain 128 on chip buffer ON Bipolar operation Chop disabled Voltage reference AVDD Continuous conversion First filter notch 4 7 Hz Internal on chip clock The software will then read 100 samples from the ADC and perform noise analysis After that you can modify any software settings or ADC setup and or repeat the sampling and analysis For further improvement of the evaluation system noise performance you can try to use a power supply less noisy than the 5V derived from 5 USB For example connect a 9V battery to the contacts on board change the link J1 SELECT AVDD to position 5V and repeat the noise test 09727 011 Figure 11 Low Noise Quick Test When Low Noise Quick Test is clicked in the main window provides instructions on the link positions for the AD7195 the user can quickly and easily measure the rms noise of the evaluation board When the instructions given on each window AD7195 The software configures the AD7195 to have a are completed click OK The AD7195 gathers 100 sample
10. system full scale calibration The the user to define the display units for the conversions For resulting coefficients are held in memory they are not written example if load cell is connected to the AD7195 the conver to the calibration registers of the ADC sions from the ADC can be displayed in grams The offset and Rev 0 Page 12 of 20 06 257 EVALUATION BOARD SCHEMATICS AND ARTWORK S10 22260 4 og 7 1 l MOL anol 508 438 5 anav 8i mal 7 L 9X3 8 43 72 4 Tz 434 1 Z yen ABS Zi a t ENY Henly td l 5 458 aE ae 0xaL De zz 1 1 A 35 E n A NOV ly cla 9 o x 2
11. 4 to C61 3 C9 C12 C14 1 uF ceramic capacitor Phycomp 2238 246 13663 6 C34 to C37 C50 to C51 4 7 uF ceramic capacitor Phycomp 2255 206 13672 4 C17 C18 C25 C30 10 uF tantalum capacitor AVX 106 0168 1 L1 Ferrite bead Tyco BMB2A1000LN2 3 R1 R2 R5 0 0 Q resistor Phycomp 232270296001 9 R3 to R4 R8 R20 to R25 100 Q resistor Phycomp 232270461001 5 R6 to R7 R52 to R54 1 resistor Phycomp 232270461002 10 R9 to R15 R19 R50 to R51 10 resistor 232270461003 1 R16 1 5 resistor Phycomp 232270461508 R17 R75 to R76 Resistor Not inserted 16 R18 R55 to R57 R62 R73 1000 resistor Phycomp 232270461004 2 R31 R32 10 resistor 232270461009 1 R74 47 resistor Phycomp 232270464709 5 S1 to 55 Switch Omron B3S 1000 1 B1 Clip for 9 V battery Keystone 593 594 1 J1 2 x 4 way header Tyco Amp 1241050 4 2 J2 J3 2 x 8 way header Tyco Amp 1241050 8 1 J4 1 x 8 way header Phoenix Contact 1803332 J5 J9 Connector 50 Q straight SMB Not inserted 1 J10 Screw terminal block Phoenix Contact 1727010 1 J31 Connector power jack barrel 2 1 mm SMD Lumberg 1613_14 1 J51 Connector USB mini B SMD Molex 548190572 J52 Header Not inserted 1 LCD module 2 x 16 char 1 x 16 pin top Everbouquet MC1602C SYR 1 LCD header Tyco 1 826629 6 2 Q1 Q4 N FET transistor NPX BSH112 2 Q2 Q7 P FET transistor NPX BSH201 Rev 0 Page 17 of 20 UG 257 NOTES Rev 0 Page 18 of 20 UG 257 NOTES Rev
12. ANALOG i DEVICES Evaluation Board User e One Technology Way P O Box 9106 Norwood MA 02062 9106 U S A Tel 781 329 4700 Fax 781 461 3113 www analog com Evaluation Board for the AD7195 4 8 kHz Ultralow Noise 24 Bit Sigma Delta ADC FEATURES Full featured evaluation board for the AD7195 Standalone interface using microcontroller and LCD display PC software for control of AD7195 using USB interface Various linking options INTRODUCTION This user guide describes the evaluation board for the AD7195 which is a 4 8 kHz ultralow noise 24 bit sigma delta ADC The AD7195 is a complete analog front end for low frequency measurement applications It contains two differential inputs four pseudodifferential inputs and includes a low noise instrumentation amplifier a reference detect and a low side power switch Full data on the AD7195 is available in the AD7195 data sheet available from Analog Devices Inc and should be consulted in conjunction with this user guide when using the evaluation board GENERAL DESCRIPTION The AD7195 evaluation kit is a powerful tool for exploring and evaluating the AD7195 features The evaluation board can be operated in complete standalone battery powered mode The LCD display is used to display the conversion data When the board is connected to and possibly powered from PC standard USB interface the PC software allows the graphical display of r
13. IST TOOL The AD7195 evaluation software can be used as a configuration assist tool even when an AD7195 evaluation board is not connected When the AD7195 evaluation board software is open click ADC Setup The message in Figure 10 appears Click Ignore The ADC Setup window opens Use the ADC Setup window to determine the values to be written to the AD7195 on chip registers for different configurations The Registers HEX section can be used When the values in this section are altered the other sections of the ADC Setup window are updated so that the user can easily see the impact of the register changes Alternatively the user can modify the other sections of the ADC Setup window and the Registers HEX section is updated with the changes Therefore the user can easily calculate the values to be written to the AD7195 for different configurations Evaluation Software xi USB INTERFACE ERROR Details Ignore Figure 10 Configuration Tool 09727 010 Rev 0 Page 9 of 20 UG 257 LOW NOISE QUICK TEST Low Noise Quick Test Hardware Setup cancer The Low Noise Quick Test helps to setup the evaluation board and to demonstrate the ADC low noise performance If you click the OK button the next screen will show you the recommended hardware setup gt Low Noan Quick Tost Herdwarn Setup Please set up the evaluation board for the noise test As a starting point Insert link Ji into position SY 058 insert
14. Positions for Noise Testing Q REFIN AD7195 09727 003 Figure 3 Noise Test Connections As per Figure 3 inserting the links in Header J3 connects a resistor network to the AD7195 The reference to the ADC is provided AVpp The resistor divider generates a bias voltage of 2 approximately Channel AIN1 AIN2 is connected to this voltage conversions can be performed using this external short to measure the rms noise peak to peak noise peak to peak resolution USING AN ABSOLUTE REFERENCE An ADR421 is included on the AD7195 evaluation board so that the part can also be evaluated using an absolute reference The reference can be connected to the REFIN pins of the AD7195 by connecting the links of J3 as shown in Figure 4 Figure 4 Connecting an Absolute Reference to the AD7195 CONNECTING THE AD7195 TO AN EXTERNAL MICROCONTROLLER The AD7195 evaluation board can be connected to an external microcontroller using Header J2 With all links in place the AD7195 is connected to the on board microcontroller How ever with these links removed the AD7195 is disconnected from the evaluation board microcontroller The user can then use a header to interface the AD7195 to the external microcontroller AIN1 AIN2 AINC AGND REF REF VREF wo 09727 004 Rev 0 Page 4 of 20 UG 257 USING THE AD7195 EVALUATION BOARD IN STANDALONE MODE
15. The AD7195 evaluation board can be operated in standalone mode In this mode the evaluation board functions as a excited weigh scale demonstration Channel AIN3 AIN4 is the analog input channel The AIN3 and AIN4 pins along with AV and AGND are connected to the J4 header This header allows the user to connect a load cell to the AD7195 The load cell should be connected to the header as shown in Figure 5 A 6 wire load cell is shown but a 4 wire load cell can also be connected The three reference links on Header J3 must be removed see Figure 6 AGND EXC REF AIN3 AIN4 REF1 BPDSW EXC 09727 005 Figure 5 Load Cell Connection to Header J4 AVpp AIN1 AIN2 AGND co 09727 006 _2 AINCOM REF REF Figure 6 Link Positions for Standalone Mode The AD7195 is configured for an update rate of 4 69 Hz and the gain is programmed to 128 Channel AIN3 AIN4 is selected as the active channel The conversions from the AD7195 are displayed on the LCD display The four buttons beneath the LCD display allow the user to calibrate the weigh scale system adjust the LCD contrast and read the offset and gain registers The function of each button is listed at the bottom of the LCD display To operate the weigh scale demonstration connect the load cell to Header J4 as shown in Figure 5 Apply power to the AD7195 evaluation board using either a 9 V battery o
16. e a specific number of samples When the option Sampling Capture Defined Sample Set is selected the sample size is entered in the Samples box Start Sampling This button allows the user to read samples from the AD7195 Data Section Display Units This button allows the user to display the conversions in hex decimal volts or in user specified units If the conversions are displayed in volts the value of the reference voltage must be entered in the Vref text box Autoscale This button allows the user to enable or disable the autoscale function on the waveform plot X scale This button allows the user to have a fixed x axis or a dynamic x axis When the x axis is fixed the number of samples to display is entered in the X scale Samples text box Analysis Section Channel The data channel to be analyzed is selected using this button After Sampling During Sampling The software can process the conversions as they are being gathered or can process the samples when the ADC has completed the selected number of conversions Analyse All Samples Analyse Last Samples This button allows the user to fix the sample size used for analyzing Alternatively the software can process all samples gathered When Analyse Last Samples is selected the sample size must be entered in the Last Samples text box The software captures all samples generated by the AD7195 If the software fails to gather all samples then the message s
17. eal time data logs the data into a text file allows the user to modify the internal settings of the AD7195 and generally helps in understanding the part features and performance Finally the flexible interface structure of the board allows it to be connected in several useful configurations For example the digital section of the evaluation board can be used indepen dently as a convenient digital interface for a user s own sensor design PCB or module containing the AD7195 Alternatively an external microcontroller can be interfaced to the AD7195 and thus the evaluation board can act as a complete analog front end for creating and debugging software on the user s digital platform EVALUATION BOARD CONNECTION DIAGRAM NOISE TEST CIRCUITRY ANALOG INPUTS PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS SPI USB INTERFACE MICRO AD7195 SENSOR CONNECTOR VOLTAGE REFERENCE REFIN VOLTAGE REGULATOR VOLTAGE REGULATOR PC AND J BASED SOFTWARE DRIVERS 09727 001 Rev 0 Page 1 of 20 UG 257 TABLE OF CONTENTS irere ROER AR EER 4 m ees Gti ORRE Generali Evaluation Board Connection REVISION History Evaluation Board
18. ect the AD7195 configuration ADC Write The information displayed in the Registers HEX section is written to the AD7195 Sections of the ADC Setup Window Analog Inputs Using the options within this section the analog input channels can be selected Gain polarity chopping can also be selected The analog inputs can be buffered or unbuffered using the Digital Filter Zero Latency 0 oa Registers HEX First Notch Hz Filter Type Status x 00 Mode 080060 Config 000117 Data f 7FFD7F Chip ID AB GpoCon 06 Offset 800000 FullScale 5540C0 09727 009 Buffer drop down menu Finally the Diagnostic drop down menu enables disables the burnout currents Digital Filter The output data rate first filter notch order of the sinc filter zero latency and enabling disabling the REJ60 bit are programmed using the options within this section The user can enter the frequency of the first filter notch and the software calculates the value to be written to Bits FS 9 0 of the mode register Alternatively the user can enter the FS 9 0 value in decimal and the software calculates the first filter notch The user can also select the sinc sinc filter and enable disable zero latency The value to be written to the AD7195 is displayed in the Registers HEX section Clock Configuration The clock to be used by the AD7195 is selected in this section When an external master clock is selected the clock
19. en gt gt gt zo eer gt Tri TIC 5 EESTE 5 Figure 16 7195 Evaluation Board Component Side View 9v ANALOG he DEVICES D EVAL AD7195EBZ J31 St sks EVALUATION BOARD re a u31 55 Gets SELECT 856 1654 2 INTERFACE Be AVDD 5 554 51 52 3 S4 J2 AGND m o MCLK 328 J4 RIT ae wm a2 Poe BPDSW REF ul ae 1 3 Jen AGND REF 9 DPsW AGND jr Ot Ri AIN4 2 REF REF AD7195 ci2 REF AIN3 5 Cora REFt AINCOM c5 cto ANCO 2 AVDD AINI c7 8 AGND R2 R3 a AGND SE22Su 52558 2 B luz AVDD 5 5 3 AGND ROW VOLTAGE REF
20. hown in Figure 8 appears The software may drop samples because e The data is being analyzed in parallel with the gathering of samples The user should delay the analysis until the samples are gathered e Other programs are running on the PC e The PC is too slow Software missed some of the ADC samples Click to clear right click for details Figure 8 Error Message When Samples Are not Captured 09727 008 Rev 0 Page 7 of 20 UG 257 ADC SETUP WINDOW ADC Setup File Cais 07195 Analog Inputs Channel Selection Gain FS bits 60Hz Rejection 3 4 Polarity BIPOLAR eee AinCom Chopping 2 AinCom AinCom Diagnostic AinCom Mode of ae pee po Rea Format ae Conversion Data pee po Data Only Figure 9 ADC Setup Window The ADC Setup window gives the user access to the AD7195 registers see Figure 9 The user can write to the registers and read from the registers This window operates even when an AD7195 evaluation board is not connected to the software It operates as an AD7195 configuration tool Buttons ADC Reset The ADC is reset to its default condition using this button ADC Read Using this button allows the values of the registers on the AD7195 to be read The ADC Setup window displays the hexadecimal values returned from the AD7195 Sections such as Analog Inputs and Digital Filter are also updated to refl
21. inks REF REF and VREF in connector J3 are removed left open The software will be set for continuous sampling and continuous analysis of last 20 samples You can modify any software settings or ADC setup any time afterwards For calculating results displayed in Volts the software will assume as default Vref AVdd 5V 09727 012 Figure 12 Weigh Scale Demo Window A load cell can be connected directly to the AD7195 evaluation board When WeighScale Demo is clicked in the main window the user is guided through a series of windows that provide information about connecting the load cell to the AD7195 evaluation board The AD7195 is automatically configured to have a gain of 128 and an output data rate of 10 Hz In addition Channel AIN3 AIN4 and dc excitation re selected When the instructions given on each window are completed click OK The AD7195 evaluation board gathers samples continuously and uses batches of 20 samples to analyze the data The software displays the maximum voltage measured the average voltage the minimum voltage the rms noise and the resolution The sample size used to process the data can be altered using the Last Samples text box Rev 0 11 of 20 UG 257 USER UNITS SETUP File Edt Operate Tools Window CANCEL To customize this software for your application you can setup a linear transfer function between the ADC output code and the display result user units
22. inv Waveform 3 00u Sample Number scale Samples 75u 9 50 9 25u 9 00 8 75 Board Connected 8 50u 8 25 8 01 Sampling Sampling Data Channel Selection Latest Data 80 Analysis Results Number Samples 0 000000 0 000000 0 000000 0 0 Bit 0 0 Bit Mean Average Maximum Value Minimum Value P P Noise RMS Noise P P Resolution RMS Resolution 09727 007 Figure 7 AD7195 Evaluation Software Main Window Rev 0 Page 6 of 20 UG 257 MAIN WINDOW Menu Bar File The File menu allows the user to write the current set of data to a file for later use log data as it is gathered and exit the program Board The Board menu allows the user to alter the contrast on the LCD display Buttons Delete Data Clear Graphs This button allows the user to delete the data displayed in the graph ADC Reset This button allows the user to reset the AD7195 to its default power on settings ADC Setup This button opens the ADC Setup window which allows the user to configure the AD7195 Low Noise Quick Test This button allows the user to access the noise testing software WeighScale Demo This button allows the user to access the weigh scale demonstration software User Units Setup This button allows the user to change the display units on the graph and histogram Sampling This button allows the user to sample continuously or to sampl
23. ion Link J1 should be placed in Position 5 V BAT e power supply can be applied J10 Link J1 should be placed in Position EXT SOCKETS There are five sockets relevant to the operation of the AD7195 on this evaluation board The functions of these sockets are outlined in Table 1 Socket Description REF Subminiature BNC SMB connector This socket is used in conjunction with REF to apply an external reference to the AD7195 The voltage for the REFIN input of the AD7195 is applied to this socket REF Subminiature BNC SMB connector This socket is used in conjunction with REF to apply an external reference to the AD7195 The voltage for the REFIN input of the AD7195 is applied to this socket AIN1 Subminiature BNC SMB connector This socket is used to apply an analog input signal to AIN1 AIN2 Subminiature BNC SMB MCLK Subminiature BNC SMB connector This socket is used to apply an analog input signal to AIN2 connector An external clock source can be applied to the AD7195 using this socket Rev 0 Page 3 of 20 UG 257 NOISE TEST Header J3 allows the user to perform noise testing of the AD7195 With all links in the vertical position see Figure 2 the analog and reference inputs are applied to the AD7195 as shown in Figure 3 AIN1 AIN2 a_o AGND REF Q_9 REF Q_9 VREF 5 09727 002 _2 AINCOM Figure 2 Link
24. ny legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County Massachusetts and Customer hereby submits to the personal jurisdiction and venue of such courts The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed 2011 Analog Devices Inc All rights reserved Trademarks and ANALOG registered trademarks are the property of their respective owners 0609727 0 5 11 0 DEVICES www analo g com Rev 0 Page 20 of 20
25. of your choice After software start the default user units are pre set as 100 for ADC operating in bipolar mode WeighScale demo function pre sets the user units approximately for load cell with sensitivity 2mV Vikg The easiest way to setup the user units is to perform a calibration as follows Connect your hardware setup ADC let software sampling and get back here Menu gt Setup gt User Units Select correct channel to which the sensor is connected Set your sensor to 0 condition for example 0 kg weight and click the Calibrate Offset button Set your sensor to another defined condition for example 1 kg weight fill out the Gain Cal Target value and click Calibrate Gain button Modify the Unit Name Gain Cal Target Unit Name Channel 4 P Calibrate Offset Calibrate Gain 1000 o While the software is sampling you can check the result instantly Latest ADC Data Latest User Result 8302730 gt 85 878 g Alternatively you can customize user units by changing the User Offset and User Gain Their meanings can be seen from the equation below User Offset User Gain Unit Name User Result ADC DATA 53556050 ORT 5 09727 013 Figure 13 User Units Setup Window In the main window click User Units Setup and the User Units gain error of the system can also be calibrated The user can Setup window shown in Figure 13 appears This window allows perform a system offset and
26. r a 9 V dc power source Ensure that Link J1 is in Position 5 V BAT EXT The weigh scale demonstration can also be powered from the USB connector if the board is connected to a PC Link J1 should be in Position 5 V USB in this case With no weight on the weigh scale perform an offset calibration Then place the expected full scale weight on the load cell and perform the full scale calibration Next select the corresponding full scale weight on the LCD display as the weigh scale demonstration supports full scale weights of 500 g to 10 kg The software then continuously reads conversions from the AD7195 scales the conversions appropriately and displays the resulting weight on the LCD display Rev 0 Page 5 of 20 UG 257 EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION The AD7195 evaluation board software should be installed before connecting the AD7195 evaluation board to the PC INSTALLING THE EVALUATION SOFTWARE To install the evaluation board software use the following steps 1 Insert the AD7195 evaluation kit CD in the CD drive of your PC The evaluation software installation wizard should start automatically after inserting the CD If the wizard does not start navigate to the AD7195 evaluation kit CD on your PC and run Setup exe At the prompt select a destination directory which is C Program Files Analog Devices AD7195 by default After the directory is selected the installation procedure copies the files in
27. s gain of 128 and an output data rate of 4 7 Hz In addition displays the results in the waveform and analyzes the data to Channel AIN1 AIN2 is selected and the reference voltage calculate the maximum conversion minimum conversion and is set to 5 V the software assumes that the 5 V from the USB average conversion The rms noise peak to peak noise and is used as the reference to the AD7195 The software also resolution are also calculated Rev 0 Page 10 of 20 WEIGH SCALE DEMO P Weighscale Demno Weighscale Demo Hardware Setup The Weigh UG 257 CANCEL CANCEL Please connect your load cell to the green connector J4 on the evaluation board as detailed on the pictures below Links REF REF and VREF connector J3 should be removed left open before connecting the loadcell The load cell s negative excitation ground can be connected to EXC or BPDSW terminal ADC s BPDSW pin If the load cell is 4 wire 5 Wagh scale Demo Connect 6 wire load ce connect shield to AGND As amp starting point pleas If you choose a different different to SV for the lod EVALUATIO BOARD CANCEL If you click the OK button now the ADC will automatically be setup as follows Analog Input AIN3 AIN4 Gain 128 on chip buffer ON Bipolar operation Chop disabled Continuous conversion First filter notch 10 Hz Internal on chip clock BPDSW ON DC Excitation Ensure l
28. th applicable law including but not limited to the RoHS Directive TERMINATION ADI may terminate this Agreement at any time upon giving written notice to Customer Customer agrees to return to ADI the Evaluation Board at that time LIMITATION OF LIABILITY THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED AS IS AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS ENDORSEMENTS GUARANTEES OR WARRANTIES EXPRESS OR IMPLIED RELATED TO THE EVALUATION BOARD INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY TITLE FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS IN NO EVENT WILL ADI AND ITS LICENSORS LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER S POSSESSION OR USE OF THE EVALUATION BOARD INCLUDING BUT NOT LIMITED TO LOST PROFITS DELAY COSTS LABOR COSTS OR LOSS OF GOODWILL ADI S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS 100 00 EXPORT Customer agrees that it will not directly or indirectly export the Evaluation Board to another country and that it will comply with all applicable United States federal laws and regulations relating to exports GOVERNING LAW This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts excluding conflict of law rules A
29. the sole and exclusive purpose referenced above and agrees not to use the Evaluation Board for any other purpose Furthermore the license granted is expressly made subject to the following additional limitations Customer shall not i rent lease display sell transfer assign sublicense or distribute the Evaluation Board and ii permit any Third Party to access the Evaluation Board As used herein the term Third Party includes any entity other than ADI Customer their employees affiliates and in house consultants The Evaluation Board is NOT sold to Customer all rights not expressly granted herein including ownership of the Evaluation Board are reserved by ADI CONFIDENTIALITY This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason Upon discontinuation of use of the Evaluation Board or termination of this Agreement Customer agrees to promptly return the Evaluation Board to ADI ADDITIONAL RESTRICTIONS Customer may not disassemble decompile or reverse engineer chips on the Evaluation Board Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board including but not limited to soldering or any other activity that affects the material content of the Evaluation Board Modifications to the Evaluation Board must comply wi
30. to the relevant directories on the hard drive The installation program creates a program group called Analog Devices with the subgroup AD7195 in the Start menu of the taskbar Once the installation procedure is complete double click the AD7195 icon to start the program P AD719x Evaluation Board Software CONFIGURING THE EVALUATION BOARD To install the evaluation board use the following steps 1 Connect the AD7195 evaluation board to your PC USB connector using the USB cable included in the evaluation kit The POWER LED on the evaluation board should turn on and the found new hardware wizard should start automatically on the PC 2 Follow the steps in the wizard until the installation is completed USING THE SOFTWARE Start the AD7195 evaluation software on your PC by clicking the Windows Start button select All Programs gt Analog Devices gt AD7195 gt AD7195 evaluation software The software allows the user to configure the AD7195 gather samples and analyze the data Consult the AD7195 data sheet for more information on the register bits and their functions Figure 7 shows the main window that is displayed when the program starts The Main Window section briefly describes the various menu and button options in the main window The data that has been read can be exported to other packages such as MathCAD or Microsoft Excel for further analysis 07195 Clear Graph DATA Display Units _
31. valuation board can be powered as follows e The AD7195 evaluation board is powered via the 5 supply from the USB connector J51 This 5 V supply can be used to power the AD7195 directly Link J1 should be placed in Position 5 V USB e The 5 supply from the USB connector can be regulated to 3 3 V using the on board ADP3303 3 a high precision low power 3 3 V output voltage regulator Using Link J1 the 3 3 V regulator can be used as the power supply to the AD7195 Link J1 should be placed in Position 3 3 V e The AD7195 can be powered using 9 V battery B1 or using an external 9 V dc source connected at J31 The 9 V is regulated down to 5 V using the on board ADP3303 5 a high precision low power 5 V output regulator Using Link J1 this regulated 5 V can be used as the supply to the Table 1 Socket Functions UG 257 AD7195 To use this option Link J1 should be placed in Position 5 V BAT e An external power supply can be applied via J10 Link J1 should be placed in Position EXT Standalone Operation When standalone operation is used the AD7195 evaluation board can be powered as follows e The AD7195 evaluation board can be powered using a 9 V battery B1 or using an external 9 V dc source connected at J31 The 9 V source is regulated down to 5 V using the on board ADP3303 5 a high precision low power 5 V output regulator Using Link J1 this regulated 5 V can be used as the supply to the AD7195 To use this opt
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