Tews Datentechnik TIP850 Series Manual
Contents
1. A rtisan Artisan Technology Group is your source for quality TecmologyGrap new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment 7 EQUIPMENT DEMOS HUNDREDS OF Instra zer REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at www instraview com information on price quotations drivers technical LEASING MONTHLY specifications manuals and documentation RENTALS ITAR CERTIFIED EE Contact us 888 88 SOURCE sales artisantg com www artisantg com TEWSS The Embedded I O Company TECHNOLOGIES TIP850 16 Channel 12 bit A D 4 Channel 12 bit D A Version 1 2 User Manual Issue 1 9 September 2006 D75850800 TEWS TECHNOLOGIES GmbH TEWS TECHNOLOGIES LLC Am Bahnhof 7 Phone 49 0 4101 4058 0 9190 Double Diamond Parkway Phone 1 775 850 5830 25469 Halstenbek Germany Fax 49 0 4101 4058 19 Suite 127 Reno NV 89521 USA Fax 1 775 201 0347 www tews com e mail info tews com www tews com e mail usasales tews com Artisan Technology Group2. A programmable gain amplifier allows gains of 1 10 100 or 1 2 4 8 The full scale input range is 10V The data acquisition and conversion time is up to 10us without channel gain change and up to 62us with channel gain change more information see chapter ADC Gain Depend Settling Time The four D A channels provide simultaneous loading and output voltages of 10V Default value after reset is OV for all D A channels The settling time to 0 01 is 10us maximum Each TIP850 is factory calibrated The calibration information for A D and D A circuits are stored in the Identification PROM unique to each IP 16 Channel Input Multiplexer 4 12 bit D A Converter Figure 1 1 Block Diagram TIP850 User Manual Issue 1 9 Page 6 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 2 Technical Specification IP Interface Interface Single Size IndustryPack Logic Interface compliant to ANSI VITA 4 1995 ID ROM Data Format I I O Space Used with no wait states Memory Space Not used Interrupts INTREQ0t used by A D conversion DMA Not supported Clock Rate 8 MHz Module Type Type I O Interface Number of Analog Inputs 16 single ended channels or 8 differential channels Input Gain Amplifier programmable for gain 1 10 100 TIP850 10 only programmable for gain 1 2 4 8 TIP85
3. Reset Value INTVEG7 INTVEC6 INTVEC5 INTVEC4 INTVEC3 INTVEC2 INTVEC1 INTVECO Used for IP interrupt acknowledge cycle R W TIP850 User Manual Issue 1 9 Figure 5 6 Interrupt Vector Register Page 17 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 6 Pin Assignment I O Connector TEWSS TECHNOLOGIES Signal ADC Input 9 ADC Input 1 ADC Input 2 ADC Input 2 ADC Input 12 ADC Input 4 ADC Input 4 ADC Input 4 ADC Input 5 ADC Input 5 ADC Input 6 ADC Input 6 ADC Input 7 ADC Input 7 ADC Input 8 ADC Input 8 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Signal Pin Single ended Differential DAC Output 1 AGND DAC Output 2 AGND DAC Output 3 AGND DAC Output 4 AGND GND 12V GND 12V GND 5V AGND Figure 6 1 Pin Assignment I O Connector TIP850 User Manual Issue 1 9 Page 18 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 7 Programming Notes After power up the on board ADC device is in a random state and requires two dummy conversions before operating correctly This is based on the chip design of the ADC device Software should ignore the data of the first two ADC conversions after power up
4. 5 11 0 Addressing The complete register set of the TIP850 is accessible in the I O space of the IP Address Symbol Description Size Bit Access 0x00 ADCCSR ADC Control and Status Register 16 W 0x02 ADCCON ADC Convert Register 16 W 0x04 ADCDAT ADC Data Register 16 R 0x06 DACDA1 DAC 1 Data Register 16 W 0x08 DACDA2 DAC 2 Data Register 16 W Ox0A DACDA3 DAC 3 Data Register 16 W OxOG DACDA4 DAC 4 Data Register 16 W Ox0E DACLOA DAC Load Register 16 W 0x41 INTVEC Interrupt Vector Register 8 R Figure 5 1 Register Set TIP850 User Manual Issue 1 9 Page 12 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 5 2 ADC Control and Status Register The ADC Control and Status Register ADCCSR is used to select an input channel the gain and the mode for the next data conversion by writing the corresponding bit pattern into bit 0 to bit 8 The status of the ADC can be obtained by reading bit 14 and bit 15 TEWSS TECHNOLOGIES Bit Symbol Description Access Reset Value 15 MSB ADC Busy ADC Busy Status R 0 14 Settle Busy Settling Time Busy Status R 0 13 9 8 INTENA ADC Interrupt Enable W 0 0 Interrupt is disabled 1 Interrupt is enabled 7 ASTCE ADC Automatic Settling Time Control W 0 0 automatic control is disabled 1 automatic control is enabled 6 G1 ADC Gain Selec
5. ASCII I 0x49 0x03 ASCII P 0x50 0x05 ASCII A 0x41 0x07 ASCII C 0x43 0x09 Manufacturer ID 0xB3 0x0B Model Number 0x09 for TIP850 10 0x11 for TIP850 11 0x0D Revision Ox11 Ox0F Reserved 0x00 Ox11 Driver ID Low Byte 0x00 0x13 Driver ID High Byte 0x00 0x15 Number of bytes used Ox1C 0x17 CRC board dependent 0x19 DAC1 Offset board dependent 0x1B DAC2 Offset board dependent 0x1D DAC3 Offset board dependent 0x1F DAC4 Offset board dependent 0x21 DAC1 Gain board dependent 0x23 DAC2 Gain board dependent 0x25 DAC3 Gain board dependent 0x27 DAC4 Gain board dependent 0x29 ADC Offset Gain 1 board dependent 0x2B ADC Offset Gain 2 10 board dependent 0x2D ADC Offset Gain 4 100 board dependent 0x2F ADC Offset Gain 8 board dependent 0x31 ADC Gain Gain 1 board dependent 0x33 ADC Gain Gain 2 10 board dependent 0x35 ADC Gain Gain 4 100 board dependent 0x37 ADC Gain Gain 8 board dependent Figure 4 2 ID PROM Contents TIP850 V1 1 and V1 2 This ID PROM layout is only valid for TIP850 modules with a version number of V1 1 and higher TIP850 User Manual Issue 1 9 Artisan Technology Group Quality Instrumentation Page 11 of 20 Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 5 IP Addressing TIP850 The TIP850 is controlled by a set of registers which are directly accessible in the I O address space of the IP address space
6. Issue Description Date 1 0 First Issue June 1994 1 1 Change of settling time December 1994 1 2 Change of settling time February 1996 1 3 New Hardware Version 1 2 January 2003 1 4 Addition Technical Specification April 2003 1 5 I O Pin Assignment Corrected July 2003 1 6 Description ID PROM Contents August 2003 1 7 Addition Technical Specification April 2004 1 8 Added Programming Note and Installation Note October 2004 1 9 New address TEWS LLC September 2006 TIP850 User Manual Issue 1 9 Page 3 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES Table of Contents 1 PRODUCT DESCRIPTION esnnnnennnnnnnnennnnnnnnennnnnnnnennnnnnnnennnnnnnnvennnnnnnvennnnnnnvennnnnnnueenen 6 2 TECHNICAL SPEGIPICA TION svsscsaiissscsinicsiceicesicccacacincstcasenccdccsaccnscessacninstenceinnteccsdnnce 7 3 FUNCTIONAL DESCRIPTION E 8 Bed Amal HU e EE 8 3 2 Analog Output siscesccccccsececcescetccdenetdecetec es bececei evecyevsneteaeddcacetesuadeseuervecucssuudresseicacceevndni tesseesenceeeedenes 8 3 3 Data Goreng ines secs ton aaka aaae EEN 9 3 3 1 ADG Correction el e EE 9 3 3 2 DAG Core ction formula s rrisnin saseesaasidaaces A Eaa Aaa EA iaaa aa 9 4 ID PROM CONTENTS nnnennnnnnnnennnnnnnnennnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnennnnnnnnennnnnnnunennn 10 4 1 ID PROM Contents TIP850 10 Version 1 0 rrnnnnnnnnvnvrnnnennnnnnnnvnnnvennnnnnnnnnnnnnnnnvensnnnnn
7. Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TIP850 10 16 Channel 12 bit A D gain 1 10 100 4 Channel 12 bit D A TIP850 11 16 Channel 12 bit A D gain 1 2 4 8 4 Channel 12 bit D A This manual covers both products TIP850 User Manual Issue 1 9 TEWSS TECHNOLOGIES This document contains information which is proprietary to TEWS TECHNOLOGIES GmbH Any reproduction without written permission is forbidden TEWS TECHNOLOGIES GmbH has made any effort to ensure that this manual is accurate and complete However TEWS TECHNOLOGIES GmbH reserves the right to change the product described in this document at any time without notice TEWS TECHNOLOGIES GmbH is not liable for any damage arising out of the application or use of the device described herein Style Conventions Hexadecimal characters are specified with prefix Ox i e 0x029E that means hexadecimal value 029E For signals on hardware products an Active Low is represented by the signal name with following i e IP_RESET Access terms are described as W Write Only R Read Only R W Read Write R C Read Clear R S Read Set 1994 2006 by TEWS TECHNOLOGIES GmbH IndustryPack is a registered trademark of SBS Technologies Inc Page 2 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES
8. to the 12 bit resolution of the DAC itself The DAC Data Registers are write only However loading the DAC Data Registers does not affect the analog output voltage directly All output channels will change their voltage at the same time by a write access to the DAC Load Register DACLOA Bit Symbol Description Access Reset Value 15 MSB xX We W 0x0000 13 X 12 X 11 S 10 12 bit DAC data in 2 s complement 7 6 5 4 3 2 1 0 LSB Figure 5 5 DAC Data Register Output voltages will be changed only by a write access to the DAC Load Register DACLOA after loading the DAC Data Registers 5 6 DAC Load Register A write access to the DAC Load Register with any data value is starting the conversion of the DAC Data Register content to analog for all four channels at the same time A hardware reset will force all analog outputs to a zero output voltage However this voltage is not corrected for the offset error TIP850 User Manual Issue 1 9 Page 16 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 5 7 Interrupt Vector Register The Interrupt Vector Register INTVEC is a byte wide read write register It must be loaded with the desired interrupt vector value when interrupts shall be used with the TIP850 TEWSS TECHNOLOGIES Bit Symbol Description Access
9. 0 11 only Input Voltage Range for TIP850 10 for TIP850 11 10V gain 1 10V gain 1 1V gain 10 5V gain 2 0 1V gain 100 2 5V gain 4 Note The module accuracy is guarantied at the 10V input voltage range only for voltage range of 9 6V Input Overvoltage Input overvoltage protection up to 70Vpp Input A D Converter 12 bit 10usec sampling time ADS7804 Number of Analog Outputs 4 channel Output Voltage Range 10V Output Current Minimum 5mA Output D A Converter 12 bit maximum of 10usec settling time DAC7724 Calibration Data Calibration data for gain and offset correction in ID PROM Interface Connector 50 conductor flat cable Physical Data Power Requirements 180mA typical 5V DC 10mA typical 12V DC without analog output loads 10mA typical 12V DC without analog output loads Temperature Range Operating 40 C to 85 C Storage 40 C to 125 C MTBF 456000 h Humidity 5 95 non condensing Weight 30 g TIP850 User Manual Issue 1 9 Figure 2 1 Technical Specification Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Page 7 of 20 TEWSS TECHNOLOGIES 3 Functional Description 3 1 Analog Input The TIP850 provides 16 single ended or 8 differential multiplexed analog inputs The desired input and the mode single ended o
10. NICAL SPECIFICATION rernrrrrvvrnrrrrsvvrnrrrarnrnrrrsnnrnrrrrnnrnrsrrnnrnrrrrnnrnerrrnnnnnrsrrnnnnrsrrnnnssrsnnnne 7 FIGURE 4 1 ID PROM CONTENTS TIPOGbO I0VID anneer nnne nn 10 FIGURE 4 2 ID PROM CONTENTS TIP850 V1 1 ANDVI3 11 FIGURE 5 1 REGISTER SET EE 12 FIGURE 5 2 16 BIT ADC CONTROL AND STATUS REGISTER arorennnnvvennnnavvvnrnrnavrrnrrnnrveerrnnrrenrsnrresrrnnnnn 13 FIGURE 5 3 TABLE OF ADC SETTLING TIME rrnnrornrnnnvvrnrrnnvrrrsrrnnrnrsrrnnvserrsnnrnerrrnnnnrsrrnnrnrsrrnnrnrrrrrnnnnrsrnnnne 14 FIGURE 5 4 ADC DATA REGISTER esrircrururrrieeeruiineerininanurunnnaE ni Nn in NE NNE a ANAA NK ka KENAR EEANN A K KENAAN EEEN NENEKA 15 FIGURE 5 5 DAC DATA REGISTER iernnnrorornnnvnvrrnnnnvnrrrrnnrnrsrsnnrsrsrsnnnsrsrennnnnrsrrnnnnesrsnnnnrsrrnnnnesrrnnnnsrsrsnnnesssnnne 16 FIGURE 5 6 INTERRUPT VECTOR REGISTER aaroronnnvvrrrnnnvverrrnnnnrrsrrnnnnerrrnnnnerrrnnnnrsrrnnnnrrrrnnrnrsrrnnnnnrsrrnnne 17 FIGURE 6 1 PIN ASSIGNMENT UO CONNECTOR nnar tn rnnt nn anneren nnne 18 TIP850 User Manual Issue 1 9 Page 5 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 1 Product Description The TIP850 is an IndustryPack compatible module and offers 16 single ended or 8 differential channels of 12 bit A D conversion together with 4 channels of 12 bit D A conversion The input multiplexer of the A D circuit offers analog overvoltage protection of up to 70Vpp
11. SS TECHNOLOGIES Address Function Contents 0x01 ASCII I 0x49 0x03 ASCII P 0x50 0x05 ASCII A 0x41 0x07 ASCII C 0x43 0x09 Manufacturer ID 0xB3 0x0B Model Number 0x09 0x0D Revision 0x10 Ox0F Reserved 0x00 Ox11 Driver ID Low Byte 0x00 0x13 Driver ID High Byte 0x00 0x15 Number of bytes used Ox1A 0x17 CRC board dependent 0x19 DAC1 Offset board dependent 0x1B DAC2 Offset board dependent 0x1D DAC3 Offset board dependent 0x1F DAC4 Offset board dependent 0x21 DAC1 Gain board dependent 0x23 DAC2 Gain board dependent 0x25 DAC3 Gain board dependent 0x27 DAC4 Gain board dependent 0x29 ADC Offset Gain 1 board dependent 0x2B ADC Offset Gain 10 board dependent 0x2D ADC Offset Gain 100 board dependent 0x2F ADC Gain Gain 1 board dependent 0x31 ADC Gain Gain 10 board dependent 0x33 ADC Gain Gain 100 board dependent Figure 4 1 ID PROM Contents TIP850 10 V1 0 This ID PROM layout is only valid for TIP850 10 modules with a version number of V1 0 TIP850 User Manual Issue 1 9 Page 10 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 4 2 ID PROM Contents TIP850 Version 1 1 and 1 2 Address Function Contents 0x01
12. TIP850 has four 12 bit analog outputs with a voltage range of 10V The four DAC are implemented in a single converter DAC7724 The DAC7724 has a double data buffer New data values for the outputs can be loaded for all four channels without affecting the output voltage Then with a single command all four channels update simultaneously to the new values TIP850 User Manual Issue 1 9 Page 8 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 3 3 Data Correction There are two errors that affect the DC accuracy of the ADC and DAG The first is the zero error offset For the ADC this is the data value when converting with the input connected with its own ground in single ended mode or with shorted inputs in differential mode For the DAC it is the data value required to produce a zero voltage output signal This error is corrected by subtracting the known error from all readings The second error is the gain error Gain error is the difference between the ideal gain and the actual gain of the programmable gain amplifier and the ADC respectively DAC It is corrected by multiplying the data value by a correction factor The data correction values are obtained during factory calibration and are stored in the modules individual version of the ID PROM The ADC has a pair of offset and gain correction values for each of the programmable gains The DAC has a pair of
13. The software drivers from TEWS TECHNOLOGIES already include these two dummy conversions TIP850 User Manual Issue 1 9 Page 19 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS 8 Installation Notes Make sure that all unused analog input pins are tied to the AGND signal level or any other valid signal level within the analog input voltage range This is required even if the unused channels are turned off by software If unused analog inputs are left floating they could badly degrade the performance of the active channels TIP850 User Manual Issue 1 9 Page 20 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com A rtisan Artisan Technology Group is your source for quality TecmologyGrap new and certified used pre owned equipment FAST SHIPPING AND SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT DELIVERY Experienced engineers and technicians on staff Sell your excess underutilized and idle used equipment TENS OF THOUSANDS OF at our full service in house repair center We also offer credit for buy backs and trade ins IN STOCK ITEMS www artisantg com WeBuyEquipment 7 EQUIPMENT DEMOS HUNDREDS OF Instra zer REMOTE INSPECTION LOOKING FOR MORE INFORMATION MANUFACTURERS Remotely inspect equipment before purchasing with Visit us on the web at www artisantg com 7 for more our interactive website at ww
14. egister but however it is automatically delayed by hardware until the gain depended settling time has expired The write only bit for ADC Interrupt Enable INTENA of the ADC Control Status Register is used to enable interrupt generation of the module If this bit is set to 1 an interrupt is always initiated whenever a data conversion has been completed If the module is not in the mode of automatic settling time control an additional interrupt is being generated when the settling time has been elapsed after writing to the ADC Control Status Register 5 2 2 ADC Status The status of the ADC converter can be obtained reading the ADC Busy bit and the Settle Busy bit of the ADC Control Status Register As long as ADC Busy is in the state 1 settling time did not expire after writing to the ADC Control Status Register Settle Busy bit indicates the busy status of the ADC converter itself If the automatic settling control is enabled and the ADC status is polled both bits 14 and 15 have to be 0 before the data value can be read from the ADC Data Register ADCDAT 5 2 3 ADC Gain Depend Settling Time TIP850 10 TIP850 11 Gain 1 52 us Gain 1 52 us Gain 10 44 us Gain 2 44 us Gain 100 156 us Gain 4 44 us Gain 8 44 us Figure 5 3 Table of ADC Settling Time TIP850 User Manual Issue 1 9 Page 14 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg co
15. m TEWSS TECHNOLOGIES 5 3 ADC Convert Register By writing any value into the ADC Convert Register ADCCON a data conversion is started immediately This mode is most useful if a single input channel must be sampled with a maximum data rate In this mode it is in the responsibility of the programmer to make sure that the required accuracy of the data is not affected by the settling time after a change of gain or a change of the input channel 5 4 ADC Data Register The ADC Data Register ADCDAT contains the converted data value The data bit 11 sign bit of the ADC is extended into bits 12 to 15 by hardware This allows direct processing of the data as a 16 bit two s complement integer value Bit Symbol Description Access Reset Value 15 MSB 14 13 12 11 DN Nn nN aojo CH 12 bit ADC data sign extended in 2 s complement M i wo OO Ji O LSB Figure 5 4 ADC Data Register The ADC data register can be changed as long as the ADC is busy TIP850 User Manual Issue 1 9 Page 15 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 5 5 DAC Data Register Each analog output has its own DAC Data Register DACDA1 DACDA2 DACDA3 and DACDA4 These registers can be loaded with a two s complement value Bit 12 to bit 15 are ignored due
16. nnnnnneneenennnnnn 10 4 2 ID PROM Contents TIP850 Version 1 1 and 1 2 n avereennannnnnnnnnnnnnnnnennnnnnnnnnnnnnvennnnnnnnnnnennnvenennnnnn 11 5 IP ADDRESSING TIP850 ernornsrnsrnsrnsrnsrnsrnsensensensensensensensensensensensensensensensensensensenenn 12 BA VOsAGATESSING EE 12 5 2 ADC Control and Status Regtstet uge CgeeeeeggeeE ee Eege Deeg dEEEENde dende 13 521 ADC CONTON sirieias niina aaae ara Aa AAAA e Eea ea A aA EAA Ae raae Aaaa 14 52 2 ADG Status eege einate Ee E EEE EAE EEA egene d e Edge 14 5 2 3 ADC Gain Depend Settling Time 14 5 3 ADC ESO ett l tee ees ecco de Sa da needa aaaea aa aaa suas Fada aoaaa aaa Aaaa aaas 15 54 ADC Data Register seess eege 15 5 5 ei ER LE E 16 56 e EEN EE 16 5 7 Interrupt Vector Register rrsrrnnnnvnnnnvnnnnvvnnnnvnnnnnnnnnvvnnnnvnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnn 17 6 PIN ASSIGNMENT 1 0 CONNECTOR ccccceessseeeeceenseeeeecenseeeeeenseeeseennseesees 18 7 PROGRAMMING NOTES EEN 19 8 INSTALLATION NOTES sesicesacccisesicicencctcccicctacccscasiccesscsansseacnedscnscvaceesscsdeesacencsucencuete 20 TIP850 User Manual Issue 1 9 Page 4 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES Table of Figures FIGURE 1 1 BLOCK DIAGRAM nnrornrensvvvnreravvvnrrrrsrnnnssrsrnnnssssnnnnrsssnnnnsssssnnnnssssnnnnssssnnnnssrsnnnnssssennnssrsnnrnssssnnnne 6 FIGURE 2 1 TECH
17. offset and gain correction values for each single output channel The correction values are stored in the ID PROM as two s complement byte wide values in the range 128 to 127 For higher accuracy they are scaled to 1 4 LSB 3 3 1 ADC Correction formula The basic formula for correcting any ADC reading is Value Reading 1 Gaincorr 8192 Offsetcorr 4 Value is the corrected result Reading is the data read from the ADC Gaincorr and Offsetco are the correction factors from the ID PROM Gaincorr and Offsetcor Correction factors are stored for each for the possible gain settings Floating point arithmetic or scaled integer arithmetic is necessary to avoid rounding error while computing above formula 3 3 2 DAC Correction formula The basic formula for correcting any DAC output is Data Value 1 Gaincorr 81 92 Offsetcorr 14 Data is the number that will be sent to the DAC Value is the desired output value Gaingor and Offsetcorr are the correction factors from the ID PROM Gaincor and Offset yrr correction factors are stored for each of the four DAC outputs Floating point arithmetic or scaled integer arithmetic is necessary to avoid rounding error while computing above formula TIP850 User Manual Issue 1 9 Page 9 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com 4 ID PROM Contents 4 1 1D PROM Contents TIP850 10 Version 1 0 TEW
18. r differential are selected by programming the input multiplexer A software programmable gain amplifier with gain settings of 1 10 and 100 for the TIP850 10 and 1 2 4 and 8 for the TIP850 11 allows a direct connection of a wide range of sensors and instrumentation The maximum analog input voltage range is 10V at a gain of 1 The ADC is a 12 bit ADS7804 with a minimum sampling rate of 100 kHz The 12 data bit are aligned in the least significant 12 bit of a 16 bit data word The sign bit is extend by hardware into the upper 4 bit of the 16 bit word For this reason the data value can be directly used in 16 bit integer arithmetic as two s complement value In multiplexed analog input systems a settling time must expire before the data can be converted after the change of the input channel This settling time depends on the programmed gain At the most analog input solutions it is the responsibility of the user to observe the settling time The TIP850 module has an Automatic Settling Time Control mode If this mode is enabled a write to the ADC Control and Status Register which is necessary to select a new input channel by the multiplexer initiates a data conversion automatically after the settling time has expired The absolute accuracy of the module is increased by using the possibility to correct the data by software with factory calibration factors which are stored in the individual ID PROM of the module 3 2 Analog Output The
19. tion WwW 00 5 GO TIP850 10 TIP850 11 00 gain 1 00 gain 1 01 gain 10 01 gain 2 10 gain 100 10 gain 4 11 gain 8 4 DIF Differential Mode Enable W 0 0 Single ended Mode 1 Differential Mode 3 CS3 ADC Channel Selection 2 Cs2 Single ended Mode Differential Mode W 0000 0000 Channel 1 0000 Channel 1 1 CS1 0001 Channel 2 0001 Channel 2 0010 Channel 3 0010 Channel 3 0 LSB CSO e e 1111 Channel 16 0111 Channel 8 TIP850 User Manual Issue 1 9 Figure 5 2 16 bit ADC Control and Status Register Page 13 of 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com TEWSS TECHNOLOGIES 5 2 1 ADC Control The Channel Selection bits bit 0 to bit 3 of the ADC Control Status Register determine the input channel for the next data conversion These bits are write only The write only Differential Mode Enable Bit of the ADC Control Status Register is controlling if the module operates in differential or in single ended mode If this bit is set to 1 differential mode is selected The ADC Gain Selection bits are used to program the gain of the input amplifier These two bits are also write only If the write only bit ASTCE of the ADC Control Status Register is set to 1 the automatic control of the settling time is enabled In this mode data conversion is initiated by writing to the ADC Control Status R
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