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data sheet rev. 2.8 / may 2011 zsc31010 rbic lite ? low-cost sensor signal conditioner
zsc31010 rbic lite ? low-cost sensor signal conditioner ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without notice. brief description the rbic lite ? zsc31010 is a sensor signal condi- tioner integrated circuit, which enables easy and pre- cise calibration of resistive bridge sensors via eeprom. when mated to a re sistive bridge sensor, it will digitally correct offset and gain with the option to correct offset and gain coefficients and linearity over temperature. a second-order compensation can be enabled for temperature coefficients of gain or offset or bridge linearity. the rbic lite ? communi- cates via zmdi?s zacwire? serial interface to the host computer and is easily mass calibrated in a windows? environment. once calibrated, the output pin sig? can provide selectable 0 to 1 v, rail-to-rail ratiometric analog output, or digital serial output of bridge data with optional temperature data. features ? digital compensation of sensor offset, sensitivity, temperature drift, and non-linearity ? accommodates differential sensor signal spans, from 1.2 mv/v to 60 mv/v ? zacwire? one-wire interface (owi) ? internal temperature compensation and detection via bandgap ptat (proportional to absolute temperature) ? output options: rail-to-rail analog output voltage, absolute analog voltage, digital zacwire? one- wire interface (owi) ? optional sequential output of both temperature and bridge readings on zacwire? digital output ? fast response time, 1 ms (typical) ? high voltage protection up to 30 v with external jfet ? chopper-stabilized true differential adc ? buffered and chopper-stabilized output dac benefits ? no external trimming components required ? pc-controlled configuration and calibration via zacwire? one-wire interface ? simple, low cost ? high accuracy (0.1% fso @ -25 to 85c; 0.25% fso @ -50 to 150c) ? single pass calibration ? quick and precise ? suitable for battery-powered applications ? small sop8 package available support ? development kit available ? multi-unit calibrator kit available ? support for industrial mass calibration available ? quick circuit customization possible for large production volumes physical characteristics ? supply voltage 2.7 to 5.5 v, with external jfet 5.5v to 30 v current consumption de ? pending on adjusted s ample rate: 0.25 ma to 1 ma wide operational temperature: ? ?50 to +150c zsc31 010 application circuit ? digital output zsc3101 bsink vb vbn vss sig tm vgate 0 p 0.1 ? f v upply ground + .5 v out/owi s 4.5 to +5 vdd
zsc31010 rbic lite ? low-cost sensor signal conditioner ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. zsc31010 block diagram highly versatile applications in many markets including ? industrial ? building automation ? office automation ? white goods ? automotive ? portable devices ? your innovative designs rail-to-rail ratiometric voltage output applications absolute analog voltage output applications ordering examples (please contact zmdi sales for additional options.) sales code description package zsc31010ceb zsc31010 rbic lite ? die ? temperature range: -50c to +150c unsawn on wafer ZSC31010CEC zsc31010 rbic lite ? die ? temperature range: -50c to +150c sawn on wafer frame zsc31010ced zsc31010 rbic lite ? die ? temperature range: -50c to +150c waffle pack zsc31010ceg1 zsc31010 rbic lite ? sop8 (150 mil) ? temperature range: -50c to +150c tube: add ?-t? to sales code reel: add ?-r? zsc31010kit zsc31010 ssc evaluation kit: communication board, ssc board, sensor replacement board, evaluation software, usb cable, 5 ic samples kit sales and further information www.zmdi.com ssc@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.772 fax +49 (0)351.8822.8.7772 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886 2 2377 8189 fax +886 2 2377 8199 disclaimer : this information applies to a product under development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished he reby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incident al, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly dis claims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of zmd ag for any dama ges in connection with or arising out of the furnishing, performance or use of this technical data, whether based on cont ract, warranty, tort (including negligence), strict liability, or otherwise.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 4 of 46 contents 1 electrical char acterist ics ..................................................................................................... .8 1.1. absolute maxi mum rati ngs ............................................................................................8 1.2. recommended operati ng condit ions .............................................................................8 1.3. electrical pa rameters ......................................................................................................9 1.3.1. supply / regulation characteri stics ...........................................................................9 1.3.2. analog front-end (afe) characteri stics ....................................................................9 1.3.3. eeprom para meters ................................................................................................9 1.3.4. a/d converter char ac terist ics .................................................................................10 1.3.5. analog output (dac and bu ffer) characte ristics .....................................................10 1.3.6. zacwire? serial interface ......................................................................................10 1.3.7. system response ch aracterist ics ...........................................................................11 1.4. analog inputs versus ou tput reso lution ....................................................................... 11 2 circuit desc ription ............................................................................................................ ..14 2.1. signal flow and block diagram ....................................................................................14 2.2. analog front end ..........................................................................................................15 2.2.1. bandgap/ptat and ptat amplif ier ........................................................................15 2.2.2. bridge supply ..........................................................................................................15 2.2.3. preamp bl ock ........................................................................................................15 2.2.4. analog-to-digital converter (adc)........................................................................... 15 2.3. digital signal processor ................................................................................................16 2.3.1. eeprom ................................................................................................................. 17 2.3.2. one-wire interfac e - zacw ire? ..............................................................................17 2.4. output st a ge.................................................................................................................18 2.4.1. digital to analog conv erter (outp u t dac) ...............................................................18 2.4.2. output bu ffer ........................................................................................................... 18 2.4.3. voltage referenc e block .........................................................................................18 2.5. clock generator / power-o n reset (c lkpor) ............................................................ 19 2.5.1. trimming the o scillat o r............................................................................................20 3 functional de scripti on ........................................................................................................2 1 3.1. general work ing m ode .................................................................................................21
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 5 of 46 3.2. zacwire? communica tion interf ace ............................................................................22 3.2.1. properties and parameters ......................................................................................22 3.2.2. bit enc oding ............................................................................................................22 3.2.3. write operation from master to rbic lite ?................................................................23 3.2.4. rbic lite ? read oper ations .....................................................................................23 3.2.5. high level pr otocol ..................................................................................................26 3.3. command/data byte s encodi ng ...................................................................................27 3.4. calibration sequence ....................................................................................................28 3.5. eeprom bi ts ...............................................................................................................30 3.6. calibrati on math ............................................................................................................ 32 3.6.1. correction coe fficients ............................................................................................32 3.6.2. interpretati on of binary numbers for correction c oefficient s...................................33 3.7. reading eeprom contents .........................................................................................37 4 application circu it ex am ples ..............................................................................................38 4.1. three-wire rail-to-rail ratiometric output ................................................................... 38 4.2. absolute analog vo ltage ou tput ...................................................................................39 4.3. three-wire ratiometric output with over-voltage protecti on .......................................40 4.4. digital ou tput ................................................................................................................4 1 4.5. output short protec ti on.................................................................................................41 5 default eeprom setti ngs ..................................................................................................42 6 pin configurati on and pa ckage ..........................................................................................43 7 esd/latch-up-pr otection ...................................................................................................44 8 test ........................................................................................................................... .........44 9 quality and reliability ........................................................................................................ .44 10 customiz ation .................................................................................................................. ...44 11 ordering ex amples .............................................................................................................4 4 12 related docu ments ............................................................................................................45 13 definitions of acrony m s ......................................................................................................45 14 document revisi on history ................................................................................................46
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 6 of 46 list of figures figure 2.1 rbic lite ? zsc31010 bloc k diagram ...................................................................................................14 figure 2.2 dac output timing for highest update rate...................................................................................... 18 figure 3.1 general work ing mode........................................................................................................... .............21 figure 3.2 manchester du ty cycle.......................................................................................................... ..............22 figure 3.3 19-bit write fram e............................................................................................................. ..................23 figure 3.4 read acknowledge............................................................................................................... ...............23 figure 3.5 digital output (nom ) bridge readings ........................................................................................... ....24 figure 3.6 digital output (nom) bridge re adings with te mperature ..................................................................24 figure 3.7 read eeprom contents ........................................................................................................... .........25 figure 3.8 transmission of a numb er of data packets ....................................................................................... .25 figure 3.9 zacwire? output timing for lower update rates.............................................................................26 figure 4.1 rail-to-rail ratiomet ric voltage output........................................................................................ .......38 figure 4.2 absolute analog voltage output................................................................................................. .........39 figure 4.3 ratiometric output, temperature co mpensation via in ternal diode...................................................40 figure 6.1 rbic lite ? pin-out diagram .............................................................................................................. ....43 list of tables table 1.1 absolute maxi mum rati ngs ...................................................................................................................8 table 1.2 recommended operat ing conditions ............................................................................................... ....8 table 1.3 supply / regulation characteristics............................................................................................ ...........9 table 1.4 parameters for analog front-e nd (afe) .......................................................................................... .....9 table 1.5 eeprom para meters.............................................................................................................. ..............9 table 1.6 parameters for a/d converter ................................................................................................... ..........10 table 1.7 parameters for analog ou tput (dac and buffer) ................................................................................10 table 1.8 parameters for zacwire? serial interface ....................................................................................... ..10 table 1.9 parameters for system response................................................................................................. ......11 table 1.10 adc resolution charac teristics for an anal og gain of 6 ....................................................................11 table 1.11 adc resolution charac teristics for an anal og gain of 12 ..................................................................12 table 1.12 adc resolution charac teristics for an anal og gain of 24 ..................................................................12 table 1.13 adc resolution charac teristics for an anal og gain of 48 ..................................................................13 table 2.1 order of tr im codes ............................................................................................................ ................19 table 2.2 oscillator trimming............................................................................................................ ..................20 table 3.1 pin configuration and latch-up co nditions ...................................................................................... ..22 table 3.2 total transmission time for di fferent update rate settings and output conf iguration.....................25 table 3.3 special measurement versus u pdate rate ......................................................................................... 26 table 3.4 command/data by tes enc oding.................................................................................................... ......27 table 3.5 programming details for command 30 h ..............................................................................................27 table 3.6 zsc31010 eepr om bits ........................................................................................................... .........30
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 7 of 46 table 3.7 correction c oeffici ents ........................................................................................................ ................32 table 3.8 gain_b[13:0] weightings ........................................................................................................ .............33 table 3.9 offset_b weightings ............................................................................................................ ................34 table 3.10 gain_t we ightings .............................................................................................................. ................34 table 3.11 offset_t weightings ............................................................................................................ ................35 table 3.12 eeprom read order .............................................................................................................. ...........37 table 4.1 resistor values fo r short protection ........................................................................................... ........41 table 5.1 factory settings for the zsc310 10 eeprom .....................................................................................42 table 6.1 storage and soldering condition s for the sop- 8 package.................................................................43 table 6.2 rbic lite ? pin config uration ............................................................................................................ .....43
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 8 of 46 1 electrical characteristics 1.1. absolute maximum ratings table 1.1 absolute maximum ratings symbol parameter min max unit conditions v dd analog supply voltage -0.3 6.0 v v ina voltages at analog i/o ? in pin -0.3 vdd+0.3 v v outa voltages at analog i/o ? out pin -0.3 vdd+0.3 v t stg storage temperature range -50 150 c t stg <10h storage temperature range - 50 170 c for periods < 10 hours note: also see table 6.1 regarding soldering temperature and storage co nditions for the sop-8 package. 1.2. recommended operating conditions table 1.2 recommended operating conditions symbol parameter min typ max unit conditions v dd analog supply voltage to ground 2.7 5.0 5.5 v v supp analog supply voltage (with external jfet regulator) 5.5 7 30 v v cm common mode voltage 1 v dda - 1.3 v t amb ambient temperature range 1, 2) -50 150 ?c c vdd external capacitance between v dd and ground 100 220 470 nf r l,out output load resistance to v ss or v dd 3) 2.5 10 k? c l,out output load capacitance 4) 10 15 nf r br bridge resistance 5) 0.2 100 k? t pon power on rise time 100 ms 1) note that the maximum calibration temperature is 85c. 2) if buying die, designers should use caution not to exceed maximum junction tem perature by proper package selection. 3) when using the output for digital calibration, no pull down resistor is allowed. 4) using the output for digital calibration, c l,out is limited by the maximum rise time t zac,rise . 5) note: minimum bridge resistance is only a factor if using the bsink feature. the nominal r ds (on) of the bsink transistor is 10 ? when operating at v dd = 5 v, and 15 ? when operating at v dd = 3.0 v. this does give rise to a ratiometricity inaccuracy that becomes greater with low bridge resistances.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 9 of 46 1.3. electrical parameters 1.3.1. supply / regulation characteristics table 1.3 supply / regulation characteristics parameter symbol min typ max unit conditions supply voltage v dd 2.7 5.0 5.5 v i dd 0.25 at minimum update rate supply current (varies with update rate and output mode) 1.0 1.2 ma at maximum update rate tc reg 35 tem. -10c to 120c temperature coefficient ? regulator (worst case) * 100 ppm/k temp. < -10c and > 120c psrr 60 db dc < 100 hz (jfet regulation loop using mmbf4392 and 0.1 f decoupling cap) power supply rejection ratio * 45 db ac < 100 khz (jfet regulation loop using mmbf4392 and 0.1 ? f decoupling cap) power-on reset level por 1.4 2.6 v 1.3.2. analog front-end (afe) characteristics table 1.4 parameters for analog front-end (afe) parameter symbol min typ max unit conditions leakage current pin vbp,vbn i in_leak ? 10 na 1.3.3. eeprom parameters table 1.5 eeprom parameters parameter symbol conditions min typ max unit number write cycles n wri_eep at 150 ?c at 85 ?c ? 100 100k cycles data retention t wri_eep at 100 ?c 10 years * no verification in mass production; parameter is guaranteed by design and/or quality observation.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 10 of 46 1.3.4. a/d converter characteristics table 1.6 parameters for a/d converter parameter symbol min typ max unit conditions adc resolution r adc 14 bit integral nonlinearity (inl) 1) inl adc -4 +4 lsb differential nonlinearity (dnl) * dnl adc -1 +1 lsb response time t res,adc 1 ms varies with update rate. value given at fastest rate. 1) note: this is ? 4 lsbs to the 14-bit a-to-d conversion. this implies absolut e accuracy to 12 bits on the a-to-d result. non-linearity is typically better at temperatures less than 125c. 1.3.5. analog output (dac and buffer) characteristics table 1.7 parameters for analog output (dac and buffer) parameter symbol min typ max unit conditions max. output current i out 2.2 ma max. current maintaining accuracy resolution r out 11 bit referenced to v dd absolute error e abs -10 +10 mv dac input to output differential nonlinearity ? dnl -0.9 +1.5 lsb 11bit no missing codes upper output voltage limit v out 95% v dd r l = 2.5 k ? lower output voltage limit v out 16.5 mv 1.3.6. zacwire? serial interface table 1.8 parameters for zacwire? serial interface parameter symbol min typ max unit conditions zacwire ? line resistance * r zac,line 3.9 k? zacwire ? load capacitance * c zac,load 0 1 15 nf the rise time must be t zac,rise = 2 ? r zac,line ? c zacload ? 5s . if using a pull-up resistor instead of a line resistor, it must meet this specification. zacwire ? rise time * t zac,rise 5 s voltage level low * v zac,low 0 0.2 v dd voltage level high * v zac,low 0.8 1 v dd ? no verification in mass production; parameter is guaranteed by design and/or quality observation.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 11 of 46 1.3.7. system response characteristics table 1.9 parameters for system response parameter symbol min typ max unit conditions start-up-time t sta 10 ms power-up to output response time t resp 1 2 ms update_rate = 1 khz (1 ms) sampling rate f s 1000 hz update_rate = 1 khz (1 ms) overall linearity error e lind 0.025 0.04 % bridge input to output ? digital overall linearity error e lina 0.1 0.2 % bridge input to output ? analog overall ratiometricity error re out 0.035 % 10%vdd, not using bsink feature ac outd ? 0.1% -25c to 85c overall accuracy ? digital (only ic, without sensor bridge) ? 0.25% %fso -50c to 150c ac outa ? 0.25% -25c to 85c ? 0.35% -40c to 125c overall accuracy ? analog (only ic, without sensor bridge) 1) 2) ? 0.5% %fso -50c to 150c 1) not included is the quantization noise of the da c. the 11-bit dac has a quantization noise of ? ? lsb = 1.22 mv (5v vdd) = 0.025% 2) analog output range 2.5% to 95%. 1.4. analog inputs versus output resolution the rbic lite ? incorporates an extended 14-bit charge-balanced adc, which allows for a single gain setting on the pre-amplifier to handle bridge sensitivities from 1.2 to 36 mv/v while maintaining 8 to 12 bits of output reso- lution (default analog gain is 24). the tables below illustrate the minimum resolution achievable for a variety of bridge sensitivities. the yellow shadowed fields indicate that for these input spans with the selected analog gain setting, the quantization noise is higher than 0.1% fso. table 1.10 adc resolution characte ristics for an analog gain of 6 analog gain 6 input span [mv/v] min typ max allowed offset (+/- % of span) 1) minimum guaranteed resolution [bits] 57.3 80.0 105.8 38% 13.3 50.6 70.0 92.6 53% 13.1 43.4 60.0 79.4 73% 12.9 36.1 50.0 66.1 101% 12.6 28.9 40.0 52.9 142% 12.3 21.7 30.0 39.7 212% 11.9 1) in addition to tco, tcg
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 12 of 46 table 1.11 adc resolution characte ristics for an analog gain of 12 analog gain 12 input span [mv/v] min typ max allowed offset (+/- % of span) 1) minimum guaranteed resolution [bits] 43.3 60.0 79.3 3% 13.0 36.1 50.0 66.1 17% 12.7 25.3 35.0 46.3 53% 12.2 18.0 25.0 33.0 101% 11.7 14.5 20.0 26.45 142% 11.4 7.2 10.0 13.22 351% 10.4 3.6 2) 5.0 6.6 767% 9.4 1) in addition to tco, tcg 2) yellow shadowing indicates that for these input spans with the selected analog gain setting, the quantization noise is > 0.1% fso. table 1.12 adc resolution characte ristics for an analog gain of 24 analog gain 24 input span [mv/v] min typ max allowed offset (+/- % of span) 1) minimum guaranteed resolution [bits] 16 25.0 36 25% 12.6 12.8 20.0 28.8 50% 12 6.4 10.0 14.4 150% 11 3.2 5.0 7.2 400% 10 1.6 2) 2.5 3.6 900% 9 0.8 2) 1.2 1.7 2000% 8 1) in addition to tco,tcg 2) yellow shadowing indicates that for these input spans with the selected analog gain setting, the quantization noise is > 0.1% fso.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 13 of 46 table 1.13 adc resolution characte ristics for an analog gain of 48 analog gain 48 input span [mv/v] min typ max allowed offset (+/- % of span) 1) minimum guaranteed resolution [bits] 10.8 15.0 19.8 3% 13 7.2 10.0 13.2 35% 12.4 4.3 6.0 7.9 100% 11.7 2.9 4.0 5.3 190% 11.1 1.8 2.5 3.3 350% 10.4 1.0 2) 1.4 1.85 675% 9.6 0.72 2) 1.0 1.32 975% 9.1 1) in addition to tco,tcg 2) yellow shadowing indicates that for these input spans with the selected analog gain setting, the quantization noise is > 0.1% fso.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 14 of 46 2 circuit description 2.1. signal flow and block diagram the rbic lite ? series of resistive bridge sensor interface ics we re specifically designed as a cost-effective solution for sensing in building automation, industrial, office automation, and white goods applications. the rbiclite? employs zmdi?s high precision bandgap with proportional -to-absolute temperature (ptat) output; a low-power 14-bit analog-to-digital converter (adc, a2d, a-to-d); and an on-chip dsp core with eeprom to precisely calibrate the bridge output signal. three selectable output modes, two analog and one digital, offer the ultimate in versatility across many applications. the rbic lite ? rail-to-rail ratiometric analog output vout signal (0 to 5 v, vout @ vdd = 5 v) suits most building automation and automotive requirements. typical office automation and white goods applications require the 0 to 1 vout signal, which in the rbic lite ? is referenced to the internal bandgap. direct interfacing to p controllers is facilitated via zmdi?s single-wire serial zacwire? digital interface. the rbic lite ? is capable of running in high-voltage (5.5 to 30 v) systems when combined with an external jfet. figure 2.1 rbic lite ? zsc31010 block diagram
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 15 of 46 2.2. analog front end 2.2.1. bandgap/ptat and ptat amplifier the highly-linear bandgap/ptat provides the ptat signal to the adc, which allows accurate temperature con- version. in addition, the ultra-low ppm-bandgap provides a stable voltage reference over temperature for the operation of the rest of the ic. the ptat signal is amplified through a path in the pr e-amplifier (preamp) and fed to the adc for conversion. the most significant 12 bits of this converted result are used for temperature measurement and temperature correction of bridge readings. when temperature is output in digital mode, only the most significant 8 bits are given. 2.2.2. bridge supply the voltage driven bridge is usually connected to v dd and ground. as a power savings feature, the rbic lite ? also includes a switched transistor to interrupt the bridge current via the bsink pin. the transistor switching is synchronized to the a/d-conv ersion and released after finishing the conv ersion. to utilize this feature, the low supply of the bridge should be connected to bsink instead of ground. depending on the programmable update rate, the averag e current consumption (including bridge current) can be reduced to approximately 20%, 5% or 1%. 2.2.3. preamp block the differential signal from the bridge is amplified through a chopper-stabilized instrument ation amplifier with very high input impedance, designed for low noi se and low drift. this preamp provides gain for the differential signal and re-centers its dc to v dd /2. the output of the preamp block is fed into the a/d-converter. the calibration sequence performed by the digital core includes an au to-zero sequence to null any drift in the preamp state over temperature. the preamp is nominally set to a gain of 24. other possible gain settings are 6, 12, and 48. the inputs to the preamp from the vbn/vbp pins can be reversed via an eeprom configuration bit. 2.2.4. analog-to-digital converter (adc) a 14-bit/1 ms 2 nd -order charge-balancing adc is used to convert signals coming from the preamp. the con- verter, designed in full differential switched-capacitor techni que, is used for converting the various signals to the digital domain. this principle offers the following advantages: high noise immunity because of the differ ential signal path and integrating behavior independent from clock frequency drift and clock jitter fast conversion time owing to second order mode four selectable values for the zero point of the input voltage allow the conversion to adapt to the sensor?s offset parameter. the conversion rate varies with the programmed update rate. the fastest conversion rate is 1 k samples/s; the response time is then 1 ms. based on a best fit, the integral nonlinearity (inl) is < 4 lsb 14bit .
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 16 of 46 2.3. digital signal processor a digital signal processor (dsp) is used for processing the converted bridge data as well as for performing temperature correction and for computing the temp erature value for output on the digital channel. the dsp reads correction coefficients from the eeprom and can correct for ? bridge offset ? bridge gain ? variation of bridge offset over temperature (tco) ) _ _( tcotboffset rawbr ) 1(_ tcgtbgainzb ? ? ? ? ? .1( zb a single second order effect (sot - second order term) lied to correct one and only one of the following: e measurement ing, th en the correction formula for the bridge reading is repres (2) ` where: digital or analog output on sig? pin tions ading converted from ptat signal t_b ent offset t setl = eference value (see zsc31010_15_tech_notes_cal_dll_exe_rev_x_xy.pdf ote: see section 3.6.2.7 for limitations when sot applies to the bridge reading. ??? ? ? variation of bridge gain over temperature (tcg) ? the eeprom contains a single sot that can be app ? 2 nd order behavior of bridg ? 2 nd order behavior of tco ? 2 nd order behavior of tcg (for more details, see section 3.6.1 .) if the sot applies to corre cting the bridge read ented as a two step process as follows: (1) ) 25 zbsot br ??? br = corrected bridge reading that is fed as zb = intermediate result in the calcula br_raw = raw bridge reading from adc t_raw = raw temperature re gain_b = bridge gain term offse = bridge offset term tcg = temperature coefficient gain tco = temperature coeffici ? t = ( t_raw - t setl ) t_raw = raw temperature reading converted from ptat signal raw ptat r for details. ) sot = second order term n
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 17 of 46 )] (_ _[) 1(_ tcotsottboffset rawbrtcgtbgainbr ? ? ? ? ? ? ???? ? ] _ _[)] (1[_ tcotboffset rawbrtcgtsottbgainbr ? ? ? ? ? ????? ? )_ _(_ toffset rawttgaint ? ? if the nd s: (3) nd s: (4) signal, so temperature correction can always simply be ccomplished with a linear gain and offset term. correc (5) where: om ptat signal fficient gain_t = temperature gain coefficient ift register. during an eeprom read, the ar ally 6 ms. note: eeprom writing can only be perform ed at temperatures lower than 85c. ates via a one-wire serial interface (owi, zacwire?). there are different commands available esult of the ad c (get_br_raw, get_t_raw) ? writing to the eeprom (trim setting, configuration, and coefficients) sot applies to corre cting the 2 order behavior of tco , then the formula for bridge co rre ction is as follow note: see section 3.6.2.7 for limitations when sot applies to tco. if the sot applies to corre cting the 2 order behavior of tcg, then the formula for bridge co rre ction is as follow the ban dgap reference gives a very linear ptat a ted temp reading: t_raw = raw temperature reading converted fr offset_t = temperature sensor offset coe 2.3.1. eeprom the eeprom contains the calibration c oefficients for gain and offset, etc., and the configuration bits, such as output mode, update rate, etc. when programming the eeprom, an internal charge-pump voltage is used, so a high voltage supply is not needed. the eeprom is implemented as a sh contents are shifted 8 bits before ea ch transmission of one byte occurs. the ch ge-pump is internally regulated to 12.5 v, and the programming time is typic 2.3.2. one-wire interface - zacwire? the ic communic f or the following: ? reading the conversion r ? calibration commands ? reading from the eeprom (dump of entire contents)
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 18 of 46 2.4. output stage 2.4.1. digital to analog converter (output dac) an 11-bit dac, based on sub-ranging resistor strings, is used for the digital-to-analog output conversion in the analog ratiometric and absolute analog voltage modes. se lection during calibration co nfigures the system to operate in either of these modes. the design allows fo r excellent testability as well as low power consumption. figure 2.2 shows the data timing of the dac outpu t with the 1 khz upd ate rate setting. figure 2.2 dac output timing for highest update rate settling time 64 ? s ad conversion 768 ? s calculation 160 ? s dac output occurs here dac output next update settling time 64 ? s ad conversion 768 ? s calculation 160 ? s 2.4.2. output buffer a rail-to-rail operational amplifier (opamp) configured as a unity gain buffer can driv e resistive loads (whether pull-up or pull-down) as low as 2.5 k ? and capacitances up to 15 nf. to limit the error due to amplifier offset voltage, an error compensation circuit is included whic h tracks and reduces the offset voltage to < 1 mv. 2.4.3. voltage reference block a linear regulator control circuit is included in the volt age reference block to interface with an external jfet to allow operation in systems where the supply voltage ex ceeds 5.5 v. this circuit can also be used for over- voltage protection. the regulator set point has a coarse adjustment via an eeprom bit (see section 2.3.1 ), which can a djust the set point around 5.0 v or 5.5 v. in addition, the 1 v trim setting (see below) can also act as a fine adjustment for the regulation set point. note: if using the external jfet for over-voltage protec tion purposes (i.e., 5 v at jfet drain and expecting 5 v at jfet source), there will be a voltage drop across t he jfet; therefore ratiometricity will be compromised somewhat depending on the rds(on) of the chosen jfet. a vi shay j107 is the best choice, because it has only an 8 mv drop worst case. if using as regulation instead of over-voltage, an mmbf4392 also works well. the voltage reference block uses the absolute refer ence voltage provided by t he bandgap to produce two regulated on-chip voltage references. a 1 v reference is us ed for the output dac high reference, when the part is configured for 0 to 1 v analog output. for this reason, t he 1 v reference must be very accurate and includes trim, such that its value can be trimmed wi thin +/-3 mv of 1.0 v. the 1 v reference is also used as the on-chip reference for the jfet regulator block, so the regulation set point of the jfet regulator can be fine-tuned, using the 1 v trim. the 5 v reference can be trimmed within +/-15 mv. table 2.1 shows the order of trim codes with 0111 b for the lowest reference voltage, and 1000 b for the highest reference voltage.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 19 of 46 table 2.1 order of trim codes order 1vref/5vref__trim3 1vref/5vref_trim2 1vref/5vref_trim1 1vref/5vref_trim0 highest reference voltage 1 0 0 0 ... 1 0 0 1 ... 1 0 1 0 ... 1 0 1 1 ... 1 1 0 0 ... 1 1 0 1 ... 1 1 1 0 ... 1 1 1 1 ... 0 0 0 0 ... 0 0 0 1 ... 0 0 1 0 ... 0 0 1 1 ... 0 1 0 0 ... 0 1 0 1 ... 0 1 1 0 lowest reference voltage 0 1 1 1 2.5. clock generator / power-on reset (clkpor) if the power supply exceeds 2.5 v (max imum), the reset signal de-asserts, and the clock generator starts oper- ating at a frequency of approximately 512 khz (+17% / -22%). the exact va lue only influences the conversion cycle time and the communication to the outside world, but not the accuracy of signal processing. in addition, to minimize the oscillator error as the v dd voltage changes, an on-chip regulator is used to supply the oscillator block.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 20 of 46 2.5.1. trimming the oscillator trimming is performed at wafer level, and it is strongly recommended that this is not to be changed during calibration, because zacwire? communication is no longer guaranteed at different oscillator frequencies. table 2.2 oscillator trimming trimming bits delta frequency (khz) 100 +385 101 +235 110 +140 111 +65 000 nominal 001 -40 010 -76 011 -110 example: programming 011 b ? the trimmed frequency = nominal value - 110 khz.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 21 of 46 3 functional description 3.1. general working mode the command/data transfer takes place via the one-wire sig? pin, using the zacwire? serial communication protocol. after power-on, the ic waits for 6 ms (i.e ., the command window) for the start_cm command. without this command, the normal operation mode (nom) starts. in this mode, raw bridge values are converted, and the corrected values are presented on the output in analog or digital format (depending on the configuration stored in eeprom). command mode (cm) can only be entered during the 6 ms command window after power-on. if the ic receives the start_cm command during the command window, it rema ins in the command mode. the cm allows changing to one of the other modes via command. after command st art_rm, the ic is in the raw mode (rm). without correction, the raw values are transmitted to the digi tal output in a predefined order. the rm can only be stopped by power-off. raw mode is used by the calibration software for collection of raw bridge and temperature data, so the correction coefficients can be calculated. figure 3.1 general working mode
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 22 of 46 3.2. zacwire? communication interface 3.2.1. properties and parameters table 3.1 pin configuration and latch-up conditions no. parameter symbol min typ max unit comments 1 pull-up resistor (on-chip) r zac,pu 30 k ? on-chip pull-up resistor switched on during digital output mode and during cm mode (first 6 ms after power up) 2 pull-up resistor (external) r zac,pu_ext 150 ? if the master communicates via a push-pull stage, no pull-up resistor is needed; otherwise, a pull-up resistor with a value of at least 150 ? must be connected. 3 zacwire? rise time t zac,rise 5 s any user rc network included in sig? path must meet this rise time 4 zacwire? line resistance 1) r zac,line 3.9 k ? also see table 1.8 5 zacwire? load capacitance 1) c zac,load 0 1 15 nf also see table 1.8 6 voltage low level v zac,low 0 0.2 v dd rail-to-rail cmos driver 7 voltage high level v zac,high 0.8 1 v dd rail-to-rail cmos driver 1) the rise time must be t zac,rise = 2 ? r zac,line ? c zacload ? 5 ? s . if using a pull-up resistor instead of a line resistor, it must meet this specification. 3.2.2. bit encoding figure 3.2 manchester duty cycle bit window 106.8 sec @ 9.4khz baud 40sec @ 25khz baud start bit = 50% duty cycle used to set up strobe time start bit logic 1 logic 0 logi c 1 = 75% duty cycle logic 0 = 25% duty cycle stop time the zacwire? bus will be held high for 32 s (nominal) between consecutive data packets regardless of baud rate.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 23 of 46 3.2.3. write operation from master to rbic lite ? the calibration master sends a 19-bit packet frame to the ic. figure 3.3 19-bit write frame the incomin g serial signal will be sampled at a 512 khz clock rate. this protocol is very tolerant to clock skew, and can easily tolerate baud rates in the 6 khz to 48 khz range. 3.2.4. rbic lite ? read operations the incoming frame will be checked for proper parity on both, command and data bytes, as well as for any edge time-outs prior to a full frame being received. once a command/data pair is received, the rbic lite ? will perform that command. after the command has been successfully executed by the ic, the ic will acknowledge succ ess by a transmission of an a5 h -byte back to the master. if the master does not receive an a5 h transmission within 130 ms of issuing the command, it must assume the command was either improper ly received or could not be executed. figure 3.4 read acknowledge
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 24 of 46 the rbic lite ? transmits 10-bit bytes (1 start bit, 8 data bits, 1 parity bit). during calibration and configuration, transmissions are normally either a5 h or data. a5 h indicates successful completion of a command. there are two different digital output modes configurable (digital out put with temperature, and digital output with only bridge data). during normal operation mode, if the part is conf igured for digital output of the bridge reading, it first transmits the high byte of bridge data, followed by the low byte. the bridge data is 14 bits in resolution, so the upper two bits of the high byte are always zero-padded. there is a 32 s stop time when the bus is held high between bytes in a packet. figure 3.5 digital output (nom) bridge readings the second digital output mode is digital output bridge read ing with temperature. it will be transmitted as a 3-data- byte packet. the temperature byte represents an 8-bi t temperature quantity, spanning from -50 to 150c. figure 3.6 digital output (nom) bridge readings with temperature the eeprom transmission occurs in a packet with 14 data bytes, as shown below. 2 data byte packet (digital bridge output ) p 7 6 5 4 3 2 1 0 stop s p 0 0 5 4 3 2 1 0 s data byte bridge high data byte bridge low s p 2 stop start bit parity bit of data byte data bit (example: bit 2) 32 s 3 data byte packet (digital bridge output with temperature ) p 7 6 5 4 3 2 1 0 stop s p 0 0 5 4 3 2 1 0 s data byte bridge high data byte bridge low p 7 6 5 4 3 2 1 0 stop s data byte temperature
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 25 of 46 figure 3.7 read eeprom contents there is a variable idle time between packets, wh ich varies with the update rate setting in the eeprom. figure 3.8 transmission of a number of data packets the table below shows the idle time between packets versus the update rate. this idle time can vary by nominal +/-15% between parts, and over a te mperature range of -50 to 150oc. transmissions from the ic occur at one of two speeds depending on the update rate programmed in eeprom. if the user chooses one of the two fastest update rates (1 ms or 5 ms) then the baud rate of the digital transmission will be 32 khz (minimum 25 khz). if, however, the user ch ooses one of the two slower update rates (25 ms or 125 ms), then the baud rate of the digital tr ansmission will be 8 khz (maximum 9.4 khz). the total transmission time for both digi tal output configurations is shown in table 3.2 . table 3.2 total transmission time for different up date rate settings and output configuration update rate baud rate* idle time transmission time ? bridge only readings transmission time ? bridge & temperature readings 1 ms (1 khz) 32 khz 1.0 ms 20.5 bits 31.30 s 1.64 ms 31.0 bits 31.30 s 1.97 ms 5 ms (200 hz) 32 khz 4.85 ms 20.5 bits 31.30 s 5.49 ms 31.0 bits 31.30 s 5.82 ms 25 ms (40 hz) 8 khz 22.5 ms 20.5 bits 125.00 s 25.06 ms 31.0 bits 125.00 s 26.38 ms 125 ms (8 hz) 8 khz 118.0 ms 20.5 bits 125.00 s 120.56 ms 31.0 bits 125.00 s 121.88 ms * typical values. minimum baud rate for 1 ms or 5 ms: 26khz; maximum baud rate for 25 ms or 125 ms: 9.4khz. 14 data byte packet (read eeprom ) p 7 6 5 4 3 2 1 0 p stop s 3 stop s p s stop s p 7 6 5 4 3 2 1 0 7 6 5 4 5 4 3 2 1 0 1 0 1 0 0 1 0 1 ... eeprom byte 13 data byte a5 h eeprom byte 12 eeprom byte 2 eeprom byte 1 s p p stop s p s p s idle time 0 0 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 0 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 0 5 4 idle time idle time 1 0 p stop s 2 packet transmission (this example shows 2 data packets )
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 26 of 46 the temperature raw reading is performed less often than a bridge reading, because the temperature changes more slowly. table 3.3 shows the timing for the special measurements (tempe rat ure and bridge measurement) in the different update rate modes. table 3.3 special measurement versus update rate update rate setting special measurement 00 every 128 bridge measurements 01 every 64 bridge measurements 10 every 16 bridge measurements 11 every 8 bridge measurements it is easy to program any standard microcontroller to communicate with the rbic lite ?. zmdi can provide sample code for a microchip pic microcontroller. for update rates less than 1 khz, the output is followed by a power-down, as shown below. figure 3.9 zacwire? output timing for lower update rates 3.2.5. high level protocol the rbic lite ? will listen for a command/data pair to be transmi tted for the 6 ms after the de-assertion of its internal power-on reset (por). if a transmission is not received within th is time frame, then it will transition to normal operation mode (nom). in nom, it will output bri dge data in 0 to 1 v analog, rail-to-rail ratiometric analog output, or digital output, depending on how t he part is currently configured. if the rbic lite ? receives a start cm command within the first 6 ms after the de-assertion of por, then it will go into command mode (cm). in this mode, calibration/configuration commands will be executed. the rbic lite ? will acknowledge successful execution of commands by transmission of an a5 h . the calibrating/ configuring master will know that a command was not successfully executed if no response is received after 130 ms of issuing the command. once in command interpreting/executing mode, the rbic lite ? will stay in this mode until power is removed, or a start nom (start normal operation m ode) command is received. the start cm command is used as an interlock mechanism, to prevent a spurious entry into command mode on power-up. the first command received within the 6 ms window of por must be a start cm command to enter into command interpreting mode. any other commands will be ignored.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 27 of 46 3.3. command/data bytes encoding the 16-bit command/data stream sent to the rbic lite ? can be broken into 2 bytes, shown in table 3.4 . the most signifi cant byte encodes the command byte. the l east significant byte represents the data byte. table 3.4 command/data bytes encoding command byte data byte description 00 h xx h read eeprom command via sig? pin; for more details, refer to section 3.7 . 20 h 5x h enter test mode (subset of command mode for test purposes only): sig? pin will assume the value of different internal test points dependi ng on the most significant nibble of data sent. dac ramp test mode. gain_b[13:3] contains the starting point, and the increment is (offset_b/8). the increment will be added every 125 sec. 30 h dd h trim/configure: higher nibble of data byte determi nes what is trimmed/configured. lower nibble is data to be programmed. see table 3.5 for configuration details of data byte dd h . 00 h start nom => ends command mode, tr ansition to normal operation mode 40h 10 h start raw mode (rm) in this mode, if gain_b = 800 h and gain_t = 80 h , then the digital output will simply be the raw values of the adc for the bridge reading and the ptat conversion. 50 h xx h start_cm => start the command mode; used to enter command interpret mode 60 h dd h program sot (2 nd order term) 70 h dd h program t setl 80 h dd h program gain_b, upper 7 bits (set msb of dd h to 0 b ) 90 h dd h program gain_b, lower 8 bits a0 h dd h program offset_b, upper 6 bits (set the two msbs of dd h to 00 b ) b0 h dd h program offset_b, lower 8 bits c0 h dd h program gain_t d0 h dd h program offset_t e0 h dd h program tco f0 h dd h program tcg table 3.5 programming details for command 30 h 3 rd nibble 4 th nibble description 0 h xbbb b trim oscillator; only least sign ificant 3 bits of data used ( xbbb b ). 1 h bbbb b trim 1 v reference; least sign ificant 4 bits of data used ( bbbb b ). 2 h xxbb b offset mode; only least signifi cant 2 bits of data used ( xxbb b ). 3 h xxbb b set output mode; only least significant 2 bits of data used ( xxbb b ). 4 h xxbb b set update rate; only least significant 2 bits of data used ( xxbb b ). 5 h bbbb b configure jfet regulation 6 h bbbb b program the tc_cfg register. 7 h bbbb b program bits [99:96] of eeprom. (sot_cfg, pamp_gain)
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 28 of 46 3.4. calibration sequence although the rbic lite ? can function with many different types of resi stive bridges, assume it is connected to a pressure bridge for the following calibration example. in this case, calibration essentia lly involves collecting raw bridge and temperature data from the rbic lite ? for different known pressures and temperatures. this raw dat a can then be processed by the calibration master (the pc), and the calculated coefficients can then be written to the eeprom of the rbic lite ?. zmdi can provide software and hardware with samples to perform the calibration. there are three main steps to calibration: 1. assigning a unique identification to the ic. this identification is programmed into the eeprom and can be used as an index into the database stored on the ca libration pc. this database will contain all the raw values of bridge readings and temperature reading for that part, as well as the known pressure and temperature the bridge was exposed to. this unique i dentification can be stored in a combination of the following eeprom registers: t setl , tcg, tco. these registers will be overwritten at the end of the calibration process, so this unique identification is not a permanent serial number. 2. data collection. data collection involves getting raw data from the bridge at different known pressures and temperatures. this data is then stored on the calibrati on pc using the unique identification of the ic as the index to the database. 3. coefficient calculation and write. once enough dat a points have been collected to calculate all the desired coefficients, then the coefficients can be calc ulated by the calibrating pc and written to the ic. step 1: assigning unique identification assigning a unique identification number is as simple as using the commands program t setl , program tcg, and program tco. these three 8-bit registers will allow for 16m unique devices. in addition, gain_b must be programmed to 800 h (unity), and gain_t must be programmed to 80 h (unity). step 2: data collection the number of different unique (pressure, temperature) points that calibration needs to be performed at depends on the customer?s needs. the minimum is a 2-point calib ration, and the maximum is a 5-point calibration. to acquire raw data from the part, instruct the rbic lite ? to enter raw mode. this is done by issuing a start_cm (start command mode, 5000 h ) command to the ic, followed by a start_rm (start raw mode, 4010 h ) command with the lsb of the upper data nibble set. now, if the gain_b term was set to unity (800 h ) and the gain_t term was also set to unity (80 h ), then the part will be in raw mode and will be outputting raw data on its sig? pin, instead of corrected bridge and temperature values. the ca libration system should now collect several of these data points (16 each of bridge and temperature is recommended) and average them. these raw bridge and temperature measurements should be stored in the database, along with the known pressure and temperature. the output format during raw mode is bridge_high, bri dge_low, temp, each of these being 8-bit quantities. the upper 2 bits of bridge_high are zero-filled. the temp dat a (8-bit only) would not really be enough data for accu- rate temperature calibration. therefore, the upper 3 bits of temperature information are not given, but rather assumed known. therefore, effectively 11 bits of temperature information are provided in this mode.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 29 of 46 ration could also be used to obtain the tco term and the sot_br term; see section 3.6.2.7 for _tco), 2 order tcg (sot_tcg), or 2 order bridge (sot_br); see section 3.6.2.7 for limitations. step 3: coefficient calculations the math to perfo rm the coefficient calculation is very complicated and will not be discussed in detail here. there is a rough overview in section 3.6 . instead zmdi will provide software to perf orm the coeffici ent calculation. zmdi can also provide source code of the algorithms in a c-co de format. once the coefficients are calculated, the final step is to write them to the eeprom of the rbic lite ?. the number of calibration points required can be as few as two or as many as five. this depends on the precision desired, and the behavior of the resistive bridge in use. ? 2-point calibration would be used to obtain only a gain and offset term for bridge compensation with no temperature compensation for either term. ? 3-point calibration would be used to also obtain the tco term for 1 st order temperature compensation of the bridge offset term. ? 3-point calibration could also be used to obtain the additional term sot for 2 nd order correction for the bridge (sot_br), but no temperature compen sation of the bridge output; see section 3.6.2.7 for limitations. ? 4-point calibration would be used to also obtain bot h, the tco term and the tcg term, which provides st 1 order temperature compensation of the bridge offset gain term. ? 4-point calib limitations. ? 5-point calibration would be used to obtain tco, tcg, and an sot term that provides 2 nd order correction applied to one and only one of the following: 2 nd order tco (sot nd nd
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 30 of 46 3.5. eeprom bits table 3.6 shows the bit order in the eeprom, which are program med through the se rial interface. see table 5.1 for the zsc3 1010 default settings. table 3.6 zsc31010 eeprom bits eeprom range description notes 2:0 osc_trim see the table in section 2.5.1 for complete data. 100 => fa stest 101 => 3 clicks faster than nominal 110 => 2 clicks faster than nominal 111 => 1 click faster than nominal 000 => nominal 001 => 1 click slower than nominal 010 => 2 clicks slower than nominal 011 => slowest 6:3 1v_trim/jfet_trim see the table in section 2.4.3 . 8:7 a2d_offset offset selection: 11 => [-1/2,1/2] mode bridge inputs 10 => [-1/4,3/4] mode bridge inputs 01 => [-1/8,7/8] mode bridge inputs 00 => [-1/16,15/16] mode bridge inputs to change the bridge signal polarity, set tc_cfg[3](=bit 87). 10:9 output_select 00 => digital (3-bytes with parity): bridge high {00,[5:0]} bridge low [7:0] temp [7:0] 01 => 0-1 v analog 10 => rail-to-rail ratiometric analog output 11 => digital (2-bytes with parity) (no temp) bridge high {00,[5:0]} bridge low [7:0] 12:11 update_rate 00 => 1 msec (1 khz) 01 => 5 msec (200 hz) 10 => 25 msec (40 hz) 11 => 125 msec (8 hz) 14:13 jfet_cfg 00 => no jfet regulation (lower power) 01 => no jfet regulation (lower power) 10 => jfet regulation centered around 5.0 v 11 => jfet regulation centered around 5.5 v (i.e. over-voltage protection).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 31 of 46 eeprom range description notes 29:15 gain_b bridge gain: gain_b[14] => multiply x 8 gain_b[13:0] => 14-bit unsigned number representing a number in the range [0,8) 43:30 offset_b signed 14-bit offset for bridge correction 51:44 gain_t temperature gain coefficient used to correct ptat reading. 59:52 offset_t temperature offset coeffi cient used to correct ptat reading. 67:60 t setl raw ptat reference value. (see zsc31010_15_tech_notes_ cal_dll_exe_rev_x_xy.pdf for details. ) 75:68 tcg coefficient for temperature correction of bridge gain term. tcg = 8-bit magnitude of tcg term. sign is determined by tc_cfg (bits 87:84). 83:76 tco coefficient for temperature correction of bridge offset term. tco = 8-bit magnitude of tco term. sign and scaling are determined by tc_cfg (bits 87:84). 87:84 tc_cfg this 4-bit term determines options for temperature compensation of the bridge: tc_cfg[3] => if set, bridge signal polarity flips. tc_cfg[2] => if set, tcg is negative. tc_cfg[1] => scale magnitude of tco term by 8, and if sot applies to tco, scale sot by 8. tc_cfg[0] => if set, tco is negative. 95:88 sot 2 nd order term. this term is a 7-bit magnitude with sign. sot[7] = 1 ? negative sot[7] = 0 ? positive sot[6:0] = magnitude [0-127] this term can apply to a 2 nd order tcg, tco or bridge correction ? . (see tc_cfg above.) ? the sot range for the bridge correction is limited for the negative value to 0xc0 by the mathlib.dll.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 32 of 46 eeprom range description notes 99:96 {sot_cfg, pamp_gain} bits [99:98] = sot_cfg (for more details, see section 3.6.1 .) 00 = sot ap plies to bridge 01 = sot applies to tcg 10 = sot applies to tco 11 = prohibited bits [97:96] = preamp gain 00 => 6 01 => 24 (default setting) 10 => 12 11 => 48 (only the default gain setting (24) is tested at the factory; all other gain settings are not guaranteed.) 3.6. calibration math 3.6.1. correction coefficients all terms are calculated external to the ic and then programmed to the eeprom thr ough the serial interface. table 3.7 correction coefficients coefficient description gain_b gain term used to compensate span of bridge reading offset_b offset term used to compensate offset of bridge reading gain_t gain term used to compensate span of temp reading offset_t offset term used to compensate offset of temp reading sot second order term. the sot can be applied as a second order correction term for the following: - bridge measurement - temperature coefficient of offset (tco) - temperature coefficient of gain (tcg) the eeprom bits 99:98 determine what sot applies to. note: there are limitations for the sot for the bridge measurement and for the sot for the tco, which are explained in section 3.6.2.7 . t setl raw ptat reference value. (see zsc31010_15_tech_n otes_cal_dll_exe_rev_x_xy.pdf for details .) tcg temperature correction coefficient of bridge gain term (this term has an 8-bit magnitude and a sign bit (tc_cfg[2]). tco temperature correction coefficient of bridge offset term (this term has an 8-bit magnitude, a sign bit (tc_cfg[0]), and a scaling bit (tc_cfg[1]), which can multiply its magnitude by 8).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 33 of 46 3.6.2. interpretation of binary numbers for correction coefficients br_raw should be interpreted as an unsigned number in the set [0, 16383] with a resolution of 1. t_raw should be interpreted as an unsigned number in the set [0, 16383], with a resolution of 4. 3.6.2.1. gain_b interpretation gain_b shoul d be interpreted as a number in the set [0, 64]. the msb (bit 14) is a scaling bit that will multiply the effect of the remaining bits gain_b[13:0] by 8. bits ga in_b[13:0] represent a number in the range of [0, 8], with gain_b[13] having a weighting of 4, and each subseq uent bit has a weighting of ? the previous bit. table 3.8 gain_b[13:0] weightings bit position weighting 13 2 2 = 4 12 2 1 = 2 11 2 0 = 1 10 2 -1 ... ... 3 2 -8 2 2 -9 1 2 -10 0 2 -11 examples: the binary number: 010010100110001 b = 4.6489; gain_b[14] is 0 b , so the number represented by gain_b[13:0] is not multiplied by 8. the binary number: 101100010010110 b = 24.586; gain_b[14] is 1 b , so the number represented by gain_b[13:0] is multiplied by 8. limitation: using the 5-point calibration 5pt-tcg&tco&sot_tco (including the second order sot_tco), the gain_b is limited to a value equal or less than 8 (instead of 64).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 34 of 46 3.6.2.2. offset_b interpretation offset_b is a 14-bit signed binary number in two?s co mplement form. the msb has a weighting of -8192. the following bits then have a weighting of 4096, 2048, 1024, ? table 3.9 offset_b weightings bit position weighting 13 -8192 12 2 12 = 4096 11 2 11 = 2048 10 2 10 = 1024 ... ... 3 2 3 = 8 2 2 2 = 4 1 2 1 = 2 0 2 0 = 1 for example, the binary number 11111111111100 b = -4 3.6.2.3. gain_t interpretation gain_t should be interpreted as a number in the set [0,2]. gain_t[7] has a weighting of 1, and each subsequent bit has a weighting of ? the previous bit. table 3.10 gain_t weightings bit position weighting 7 2 0 = 1 6 2 -1 5 2 -2 4 2 -3 3 2 -4 2 2 -5 1 2 -6 0 2 -7
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 35 of 46 3.6.2.4. offset_t interpretation offset_t is a n 8-bit signed binary number in two?s co mplement form. the msb has a weighting of -128. the following bits then have a weighting of 64, 32, 16 ? table 3.11 offset_t weightings bit position weighting 7 -128 6 2 6 = 64 5 2 5 = 32 4 2 4 = 16 3 2 3 = 8 2 2 2 = 4 1 2 1 = 2 0 2 0 = 1 for example, the binary number 00101001 b = 41. 3.6.2.5. tco interpretation tco i s specified as an 8-bit magnitude with an additional sign bit (tc_cfg[0]), and a scalar bit (tc_cfg[1]). when the scalar bit is set, the signed tco is multiplied by 8. tco resolution: 0.175 v/v/ o c (input referred) tco range: 44.6 v/v/ o c (input referred) if the scaling bit is used, then the above resolution and r ange are scaled by 8 to give the following results: tco scaled resolution: 1.40 v/v/ o c (input referred) tco scaled range: 357 v/v/ o c (input referred) 3.6.2.6. tcg interpretation tcg i s specified as an 8-bit magnitude wi th an additional sign bit (tc_cfg[2]). tcg resolution: 17.0 ppm/ o c tcg range: 4335 ppm/ o c 3.6.2.7. sot interpretation sot is a 2 nd order term that can apply to one and only one of the following: bridge non-linearity correction, tco non-linearity correction, or tcg non-linearity correction. as it applies to bridge non-linearity correction: resolution: 0.25% @ full scale 2 nd order correction sot_br is possible up to +5%/-6.2% fu ll scale difference from the ideal fit (straight line), because the sot coefficient values are limited to the range of (0xc0 = -0.25 dec ) to (0x7f = 0.4960938 dec ). (saturation in internal arithmetic will occur at greater negative non-linearities.)
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 36 of 46 limitation: using any calibration method for which sot is app lied to the bridge measurement (sot_br), there is a possibility of calibration math overflow. this only occu rs if the sensor input exceeds 200% of the calibrated full span, which means the highest applied sensor input should never go higher than this value. example : this example of the limitation when sot is applied to the bridge reading uses a pressure sensor bridge that outputs -10 mv at the lo west pressure of interest. that point is calibrated to read 0%. the same sensor outputs +40 mv at the highest pressure of interest. that point is calibrated to read 100%. this sensor has a 50 mv span over the pressure range of interest. if the sens or were to experience an over-pressure event that took the sensor output up to 90 mv (200% of span), the inte rnal calculations could overflow. the result would be a corrected bridge reading that would not be saturated at 100% as expected, but instead read a value lower than 100%. this problem only occurs when sot is applied to correct the bridge reading. as sot applies to tcg: resolution: 0.3 ppm/( o c) 2 range: 38 ppm/( o c) 2 as it applies to tco: two settings are possible. it is possible to scale the effect of sot by 8. if tc_cfg[1] is set, then both, tco and sot?s contribution to tco, are multiplied by 8. resolution at unity scaling: 1.51 nv/v/( o c) 2 (input referred) range: 0.192 ? v/v/( o c) 2 (input referred) resolution at 8x scaling: 12.1 nv/v/( o c) 2 (input referred) range: 1.54 ? v/v/( o c) 2 (input referred) limitation: if the second order term sot applies to tco, the brid ge gain gain_b is limited to values equal or less than 8 (instead of 64).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 37 of 46 3.7. reading eeprom contents the contents of the entire eeprom memory can be read using the read eeprom command (00 h ). this command causes the ic to output co nsecutive bytes on the zacwire?. a fter each transmission, the eeprom contents are shifted by 8 bits. the bi t order of these bytes is given in table 3.12 . table 3.12 eeprom read order bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 byte 1 offset_b[7:0] byte 2 gain_t[1:0] offset_b[13:8] byte 3 offset_t[1:0] gain_t[7:2] byte 4 t setl [1:0] offset_t[7:2] byte 5 tcg[1:0] t setl [7:2] byte 6 tco[1:0] tcg[7:2] byte 7 tc_cfg[1:0] tco[7:2] byte 8 sot[5:0] tc_cfg[3:2] byte 9 osc_trim[1:0] sot_cfg[3:0] * sot[7:6] byte 10 output_ select[0] a2d_offset[1:0] 1v_trim[3:0] ** osc_trim[2] byte 11 gain_b[2:0] jfet_cfg[1:0] update_rate[1:0] output_ select[1] byte 12 gain_b[10:3] byte 13 offset_b[3:0] *** gain_b[14:11] byte 14 a5 h * sot_cfg/pamp_gain ** 1v_trim/jfet_trim *** duplicates first 4 bits of byte 1
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 38 of 46 4 application circuit examples note: the typical output analog load resistor r l = 10 k ? (minimum 2.5 k ? ). this optional load resistor can be configured as a pull-up or pull-down. if it is configur ed as a pull-down, it cannot be part of the module to be calibrated because this would prevent proper operation of the zacwire?. if a pull-down load is desired, it must be added to the system after module calibration. there is no output load capacitance needed. eeprom contents: output_select, jfet_cfg, 1v_trim/jfet-trim 4.1. three-wire rail-to-rail ratiometric output this example shows an application circuit for rail-to-ra il ratiometric voltage output configuration with temperature compensation via internal ptat. the same circuitry is applicable for a 0 to 1 v absolute analog output. figure 4.1 rail-to-rail ratiometric voltage output 2 1 5 6 7 8 3 4 zsc31010 bsink vbp n/c vbn vss sig tm vdd vgate 0.1 f v supply ground +2.7 to +5.5 v out optional bsink the option al bridge sink allows power savings switchi ng off the bridge current. the output voltage can be one of the following options: ? rail-to-rail ratiometric analog output v dd (= v supply ). ? 0 to 1 v absolute analog output. the absolute voltage out put reference is trimmable 1 v (3 mv) in the 1 v output mode via a 4-bit eeprom field (see section 2.4.3 ).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 39 of 46 4.2. absolute analog voltage output the figure below shows an application circuit for an abso lute voltage output configuration with temperature compensation via internal temperature ptat, and external jfet regulation for all industry standard applications. the gate-source cutoff voltage (v gs ) of the selected jfet must be -2 v. figure 4.2 absolute analog voltage output 2 1 5 6 7 8 3 4 zsc31010 bsink vbp n/c vbn vss sig tm vdd vgate 0.1 f v supply ground +5.5 to +30 v out optional bsink sd mmbf4392 the output signal range can be one of the following options: ? 0 to 1 v analog output. the absolute voltage output reference is trimmable: 1 v ( 3 mv) in the 1 v output mode via a 4-bit eeprom field (see section 2.4.3 ). ? rail-to-rail analog output. the on-chip reference for the jfet regulator block is trimmable: 5 v ( 15 mv) in the ratiometric output mode via a 4-bit eeprom field (see section 2.4.3 ).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 40 of 46 4.3. three-wire ratiometric output w ith over-voltage protection the figure below shows an application circuit for a ratiomet ric output configuration with temperature compensation via an internal diode. figure 4.3 ratiometric output, temperat ure compensation via internal diode in this appli cation, the jfet is used for over-voltage protection. jfet_cfg bits [14: 13] in eeprom are configured to 5.5 v. there is an additional maximum error of 8 mv caused by the non-zero r on of the limiter jfet.
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 41 of 46 4.4. digital output for all three circuits, the output signal can also be digita l. depending on the output select bits, the bridge signal, or the bridge signal and temperature signal are sent. for the digital output, no load resistor or load capacity are necessary. no pull-down resistor is allowed. if a line resistor or pull-up resistor is used, the re quirement for the rise time must be met ( ? 5 s). the ic output includes a pull-up resistor of about 30 k ? . the digital output can easily be read by firmware from a microcontroller, and zmdi can provide the customer with so ftware in developing the interface. 4.5. output short protection the output of the rbic lite ? has no short protection. therefore, a resistor r sp in series with the output must be added in the application module. refer to table 4.1 to determine the value of r sp . to minimize additional error caused by this resistor for the analog output voltage, the load impedance must meet the following requirement: r l >> r sp table 4.1 resistor values for short protection temperature range (t ambmax ) resistor r sp note up to 85c 51 ? up to125c 100 ? up to 150c 240 ? r sp = v dd /i max with i max = ([(170c - t ambmax )/(163c/w)] - v dd ? i dd ) / vdd tested at v dd =5v for 20 minutes for t ambmax
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 42 of 46 5 default eeprom settings if needed, the default setting for the zsc31010 can be reprogrammed as described in section 3 . table 5.1 factory settings for the zsc31010 eeprom eeprom range name default values (hex) until week 9/2006 default values (hex) since week 10/2006 default values (hex) since week 48/2008 2:0 osc_trim 0xx 0xx 0xx 6:3 1v_trim/jfet_trim 0xx 0xx 0xx 8:7 a2d_offset 0x0 0x3 0x3 10:9 output_select 0x3 0x2 0x2 12:11 update_rate 0x2 0x1 0x1 14:13 jfet_cfg 0x1 0x2 0x2 29:15 gain_b 0x800 0x0 0x3fff 43:30 offset_b 0x0 0x203 0x00ff 51:44 gain_t 0x80 0x80 0x80 59:52 offset_t 0x0 0x0 0x0 67:60 t setl 0x0 0x0 0x0 75:68 tcg 0x0 0x0 0x0 83:76 tco 0xe 0x0 0x0 87:84 tc_cfg 0x0 0x0 0x0 95:88 sot 0x0 0x0 0x0 99:96 {sot_cfg, pamp_gain} 0x1 0x5 0x5
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 43 of 46 6 pin configuration and package the standard package of the rbic lite ? is an sop-8 (3.81 mm / 150 mil body) with a lead-pitch 1.27 mm / 50 mil. table 6.1 storage and soldering conditions for the sop-8 package parameter symbol conditions min typ max unit ? maximum storage temperature t max _ storage less than 10hrs, before mounting 150 c minimum storage temperature t min _ storage store in original packing only -50 c maximum dry-bake temperature t drybake ? less than100 hrs total, before mounting 125 c soldering peak temperature t peak ? less than 30s (ipc/jedec-std-020 standard) 260 c figure 6.1 rbic lite ? pin-out diagram 1 2 3 4 8 7 6 5 bsink vbp n/c vbn vss sig tm vdd vgate table 6.2 rbic lite ? pin configuration pin no. name description 1 bsink optional ground connection for bridge ground. used for power savings. 2 vbp positive bridge connection 3 n/c no connection 4 vbn negative bridge connection 5 vgate gate control for external jf et regulation/over-voltage protection 6 vdd supply voltage (2.7 - 5.5 v) 7 sig? zacwire? interface (analog out, digital out, calibration interface) 8 vss ground supply
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 44 of 46 7 esd/latch-up-protection all pins have an esd protection of > 4000 v and a latch-up protection of ? 100 ma or of +8v/-4 v (to vss/vssa). esd protection referred to the human body model is tested with devices in sop-8 packages during product qualification. the esd test follows the human body model with 1.5 k ? /100 pf based on mil 883, method 3015.7. 8 test the test program is based on this dat asheet. the final parameters that will be tested during series production are listed in the tables of section 1 . the digital part of the ic includes a scan path, which can be activated and controlled d uring wafer test. it guarantees failure coverage of more than 98%. further test support for testing of the analog parts on wafer level is included in the dsp. 9 quality and reliability the rbic lite ? has successfully passed aec q100 automotive q ualification testing, which includes reliability testing for the temperature range from -50 to 150c. ** 10 customization for high-volume applications which require an upgraded or downgraded functionality compared to the zsc31010, zmdi can customize the circuit design by adding or re moving certain functional bl ocks. zmdi can provide a custom solution quickly because it has a considerable libra ry of sensor-dedicated circuitry blocks. please contact zmdi for further information. 11 ordering examples please contact zmdi sales for additional options. sales code description package zsc31010ceb zsc31010 rbic lite ? die ? temperature range:-50c to +150c unsawn on wafer ZSC31010CEC zsc31010 rbic lite ? die ? temperature range:-50c to +150c sawn on wafer frame zsc31010ced zsc31010 rbic lite ? die ? temperature range:-50c to +150c waffle pack zsc31010ceg1 zsc31010 rbic lite ? sop8 (150 mil) ? temperature range:-50c to +150c tube: add ?-t? to sales code reel: add ?-r? zsc31010kit zsc31010 ssc evaluation kit: communication board, ssc board, sensor replacement board, evaluation software, usb cable, 5 ic samples kit contact z mdi sales for support and sales of zmdi?s zsc31010 mass calibration system. ** exception: the digital circuit fault coverage is 94% fo r production testing (reference aec-q100-007).
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 45 of 46 12 related documents document file name zacwire ssc evaluation kit documentation for zsc31010 and zsc31015 zacwire_ssc_evaluation_kit_rev_x_xy.pdf zsc31010/15 technical notes ? calibration sequence, dll and exe zsc31010_15_tech_notes_cal_dll_exe_rev_x_xy.pdf ssc kits feature sheet (includes ordering codes and prices) ssc_evaluation_kits_featuresheet_rev_rev_x_xy.pdf zsc31010 rbic lite ? errata sheet ? rev c production zsc31010_rbic_lite_errat a_revc_prod_rev_x_xy.pdf zsc31010 rbic lite ? application notes ? in-circuit programming boards zsc31010_rbic_lite_app_notes_in-circuit_ programming_rev_x_xy.pdf zsc31010 rbic lite ? die dimensions and pad coordinates zsc31010_rbic_lite_tech_notes_die_pads_rev_x_xy.pdf visit zmdi?s website www.zmdi.com or contact your nearest sales office for the latest version of these documents. 13 definitions of acronyms term description adc analog-to-digital converter afe analog front-end buf buffer cm command mode cmc calibration microcontroller dac digital-to-digital converter dnl differential nonlinearity dsp digital signal processor dut device under test esd electrostatic discharge fso full-scale output inl integrated nonlinearity lsb least significant bit mux multiplexer nom normal operation mode owi one-wire interface poc power-on clear por power-on reset level psrr power supply rejection ratio ptat proportional to absolute temperature rm raw mode sot second order term
zsc31010 rbic lite ? low-cost sensor signal conditioner data sheet may 25, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 2.8 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without n otice. 46 of 46 14 document revision history revision date description 2.44 08-apr-10 clarification of part ordering codes and addition of document revision history. 2.5 27-jul-10 revision of product name from zmd31010 to zsc31010. 2.6 11-nov-10 removed reference to mass calibra tion kit; added footnote to short protection; added special measurement information ( table 3.3 ): revised stop bit definition; added eepro m specifications to secti on 1.3 ?electrical parameters.? added table 6.1 ?storage and soldering conditions? to section 6 ?pin configuration and pack age.? corrected equation (2) . revise d trim tolerances in section 2.4.3 . 2.7 30-mar-11 revision in ?related documents? tabl e for the name of the kit document. revision in table 6.1 to match the maximum temperature range in table 1.1 . updated trim tolera nces in sections 4.1 and 4.2 . correction of formula in table 4.1 . 2.8 25-may-11 revision of table 5.1 to add column for defaults as of 48/2008. revisi ons to description of t setl . sales and further information www.zmdi.com ssc@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.772 fax +49 (0)351.8822.87.772 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886 2 2377 8189 fax +886 2 2377 8199 disclaimer : this information applies to a product under development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished he reby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incident al, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly dis claims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of zmd ag for any dama ges in connection with or arising out of the furnishing, performance or use of this technical data, whether based on cont ract, warranty, tort (including negligence), strict liability, or otherwise.

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