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data sheet rev. 1.08 / august 2011 zsc31150 fast automotive sensor signal conditioner
zsc31150 fast automotive sensor signal conditioner ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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 zsc31150 is a cmos integrated circuit for highly-accurate amplification and sensor-specific correction of bridge sensor signals. digital compensation of sensor offset, sensitivity, temperature drift, and non-linearity is accomplished via an internal 16-bit risc microcontroller running a correction algorithm, with calibration coefficients stored in an eeprom. the zsc31150 is adjustable to nearly all bridge sensor types. measured values are provided at the analog voltage output or at the digital zacwire tm and i2c tm interface. the digital interface can be used for a simple pc-controlled calibration procedure, in order to program a set of calibration coefficients into an on-chip eeprom. thus, a specific sensor and a zsc31150 are mated digitally: fast, precise, and without the cost overhead associated with trimming by external devices or a laser. features ? digital compensation of sensor offset, sensitivity, temperature drift, and non-linearity ? adjustable to nearly all bridge sensor types, analog gain of 420, overall gain up to 2000 ? output options: ratiometric analog voltage output (5 - 95% in maximum, 12.4 bit resolution) or zacwire tm (digital one-wire- interface) ? temperature compensation: internal or external diode, bridge resistance, thermistor ? sensor biasing by voltage or constant current ? sample rate up to 7.8 khz ? high voltage protection up to 33 v ? supply current: max. 5.5ma ? reverse polarity and short circuit protection ? wide operation temperature up to -40?+150c traceability by user-defined eeprom entries ? several safety and diagnostic functions ? benefits ? no external trimming components required ? only a few external protection devices needed ? pc-controlled configuration and one-shot calibration via i2c tm or zacwire tm interface: simple, cost efficient, quick, and precise ? end-of-line calibration via i2c tm or zacwire tm interface ? high accuracy (0.25% fso @ -25 to 85c; 0.5% fso @ -40 to 125c) ? the zsc31150 is optimized for automotive environments by its special protection circuitry and excellent electromagnetic compatibility available support ? evaluation kits ? application notes ? mass calibration setup physical characteristics ? supply voltage 4.5 to 5.5 v ? operation temperature: -40c to 125c (-40c to +150c derated, depending on product version) available in ssop ? 14 or as die zsc31 150 application circuit gnd out vcc sensor module zsc 31150
zsc31150 fast automotive sensor signal conditioner ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. zsc31150 block diagram ordering information product sales code description package zsc31150kit evaluation kit v1.0 modular evaluation and development boards for zsc31150 kit boards, ic samples, usb cable, dvd with software and documentation zsc31150 mass calibration system v1.1 modular mass calibration system (msc) for zsc31150 mcs boards, cable, connectors, dvd with software and documentation 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 +01 (608) 829-1987 fax +01 (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 hereby 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, ind irect, incidental, 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. z md ag hereby expressly disclaims 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 damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warrant y, tort (including negligence), strict liability, or otherwise. zacwire tm ram eeprom c pga ts adc cmc rom dac bamp i 2 mu x digital data i/o a nalog block digital block zsc31150 a nalog out
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 4 of 24 contents 1 electrical characteristics ..................................................................................................... ..........................6 1.1. absolute maxi mum rati ngs....................................................................................................................6 1.2. operating co nditions........................................................................................................... ...................6 1.3. electrical parameters .......................................................................................................... ...................7 1.3.1. supply current and system operation co nditions ..........................................................................7 1.3.2. analog front-end (afe) characteristics ......................................................................................... 7 1.3.3. temperature measurement (refer chapter 2.4) ...............................................................................7 1.3.4. ad-conver sion.................................................................................................................. ...............7 1.3.5. sensor connec tion check ........................................................................................................ .......8 1.3.6. dac & analog output (pin aout) ................................................................................................ .8 1.3.7. system response ................................................................................................................ ............8 1.4. interface characte ristics & eeprom............................................................................................. ........9 1.4.1. i2c tm interface (refer 'zsc31150 functional description' for ti ming details) ...................................9 1.4.2. zacwire? one wire interface (owi).............................................................................................. 9 1.4.3. eeprom......................................................................................................................... .................9 2 circuit description ............................................................................................................ ...........................10 2.1. signal flow .................................................................................................................... .......................10 2.2. application modes .............................................................................................................. ..................11 2.3. analog front end (afe) ......................................................................................................... ..............11 2.3.1. programmable gain am plifier (p ga).............................................................................................1 1 2.3.2. offset comp ensation ............................................................................................................ .........12 2.3.3. measurement cycle .............................................................................................................. .........12 2.3.4. analog-to-digita l converter.................................................................................................... ........13 2.4. temperature measur ement ........................................................................................................ ..........14 2.5. system control and condi tioning calc ulation .................................................................................... ..15 2.5.1. operati on modes................................................................................................................ ............15 2.5.2. start up phase................................................................................................................. ..............15 2.5.3. conditioning ca lculation ....................................................................................................... .........15 2.6. analog out put aout............................................................................................................. ...............16 2.7. serial digita l interf ace ....................................................................................................... ...................16 2.8. failsafe features, watchd og and error de tection ...............................................................................1 6 2.9. high voltage, reverse polarity and short circuit protecti on ...............................................................17 3 application circ uit examples................................................................................................... ....................18 4 pin configuration, latch-up and esd pr otection ................................................................................. ......20 4.1. pin configuration and latch-up co nditions...................................................................................... ....20 4.2. esd-protection ................................................................................................................. ....................20 5 package........................................................................................................................ ...............................21 6 quality and re liability........................................................................................................ ..........................21 7 customization.................................................................................................................. ............................21 8 ordering in format ion ........................................................................................................... ........................22 9 additional do cuments ........................................................................................................... ......................22 10 glossary ....................................................................................................................... ...............................23 11 document revi sion hist ory ...................................................................................................... ...................24
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 5 of 24 list of figures figure 2.1 block diagram of the zsc31150 ...................................................................................................10 figure 2.2: measurement cycle .......................................................................................................................13 figure 3.1: bridge in voltage mode, external diode temperature sensor .....................................................18 figure 3.2: bridge in voltage mode, external thermistor ................................................................................19 figure 3.3: bridge in current mode, temperature measurement via bridge tc .............................................19 figure 5.1: zsc31150 pin diagram .................................................................................................................21 list of tables table 1.1 absolute maximum ratings .............................................................................................................6 table 1.2 operating conditions .......................................................................................................................6 table 2.1 adjustable gains, resulting sensor signal spans and common mode ranges .........................11 table 2.2 analog zero point shift ranges (xzc) ..........................................................................................12 table 2.3: analog output resolution versus sample rate ............................................................................14 table 3.1: application circuit parameters ......................................................................................................18 table 4.1: ..................................................................................20 pin configuration and latch-up conditions
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 6 of 24 1 electrical characteristics 1.1. absolute maximum ratings parameters apply in operation temperature range and without time limitations. table 1.1 absolute maximum ratings no. parameter symbol conditions min max unit 1.1.1 supply voltage 1 vdde amr to vsse, refer to chapter 3 for application circuits -33 33 vdc 1.1.2 potential at pin aout 1 v out related to vsse -33 33 vdc 1.1.3 analog supply voltage 1 vdda amr related to vssa, vdde - vdda < 0.35 v -0.3 6.5 vdc 1.1.4 voltage at all analog and digital io ? pins v a_io v d_io related to vssa -0.3 vdda + 0.3 vdc 1.1.5 storage temperature t stg -55 150 ?c 1.2. operating conditions all voltages are related to vssa. table 1.2 operating conditions parameter no. symbol conditions min typ max unit 1.2.1 ambient temperature 2 t amb tqe -40 150 ?c 1.2.2.1 ambient temperature advanced performance 4 t amb_tqa tqa -40 125 ?c 1.2.2.2 ambient temperature advanced performance 4 t amb_tqi tqi -25 85 ?c 1.2.3 supply voltage v dde 4.5 5.0 5.5 vdc 1.2.4 bridge resistance 3 , 4 r br_v bridge voltage mode 2 25 k? 1.2.5 bridge resistance 3 , 4 r br_c bridge current excitation, note i br_max 10 k? 1.2.6 resistor r ibr 4 r ibr i br = vdda / (16 * r ibr ) 0.07 * r br k? 1.2.7 maximum bridge current i br_max 2 ma 1.2.8 maximum bridge top voltage v br_top ( 15 / 16 * vdda) - 0.3 v 1.2.9 tc current reference resistor 4 tc r ibr behavior influences generated current 50 ppm/k 1 refer to the 'zsc31150 high voltage protection descr iption' for specificati on and detailed conditions 2 notice temperature profile description in the 'zsc31150 dice package document' for operation in temperature range > 125 c 3 symmetric behavior and identical electric al properties (especially with regard to the low pass characteristic) of both sensor inputs of the zsc31150 are required. unsymmetrical c onditions of the sensor and/or external co mponents connected to the sensor input pins of zsc31150 can generate a failure in signal operation 4 no measurement in mass production, parameter is guaranteed by design and/or quality observation.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 7 of 24 1.3. electrical parameters all parameter values are valid on behalf on in chapter 1.2 specified operating condit ion s (special definitions excluded). all voltages related to vssa. no. parameter symbol conditions min typ max unit 1.3.1. supply current and sy stem operation conditions 1.3.1.1 supply current t adv without bridge and load current, f clk ? 3 mhz 5.5 ma 1.3.1.2 clock frequency t amb_tqa guaranteed adjustment range 2 1 3 4 1 mhz 1.3.2. analog front-end (afe) characteristics 1.3.2.1 input span v in_sp analog gain: 420 to 2.8 1 275 mv/v 1.3.2.2 analog offset compensation range depends on gain adjust, refer to chapter 2.3.2 -300 300 % v in_sp 1.3.2.3 parasitic differential input offset current 1 i in_off within t amb; within t amb_tqi -10 -2 10 2 na na 1.3.2.4 common mode input range v in_cm depends on gain adjust, no xzc, refer to chapter 2.3.1 0.29 * vdda 0.65 * vdda v 1.3.3. temperature meas urement (refer chapter 2.4 ) 1.3.3.1 external temperature diode channel gain a tsed 300 1300 ppm fs / (mv/v) 1.3.3.2 external temperature diode bias current i tse 6 10 20 ? a 1.3.3.3 external temperature diode input range 1 0 1.5 v 1.3.3.4 external temperature resistor channel gain a tser 1200 3500 ppm fs / (mv/v) 1.3.3.5 external temperature resistor / input voltage range 1 v tser 0 600 mv/v 1.3.3.6 internal temperature diode sensitivity st tsi raw values ? without conditioning 700 2700 ppm fs / k 1.3.4. ad-conversion 1.3.4.1 a/d resolution 1 r adc 13 16 bit 1.3.4.2 dnl 1 dnl adc 0.95 lsb 1.3.4.3 inl tqa 1 inl adc 4 lsb 1.3.4.4 inl tqe inl adc r adc =13bit, f clk =3mhz, best fit, 2nd order, complete afe, 1.3.4.5 5 lsb 1.3.4.5 adc input range range 10 90 %vdda 1 no measurement in mass production, parameter is guaranteed by design and/or quality observation.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 8 of 24 no. parameter symbol conditions min typ max unit 1.3.5. sensor connection check 1.3.5.1 sensor connection loss r scc_min detection threshold 100 k? 1.3.5.2 sensor input short r ssc_short short detection guaranteed 0 50 ? 1.3.5.3 sensor input no short r ssc_pass short is never detected 1000 ? 1.3.6. dac & analog output (pin aout) 1.3.6.1 d/a resolution r dac analog output, 10-90% 12 bit 1.3.6.2 output current sink and source for vdde=5v i src/sink_out v out : 5-95%, r load >=2k ? v out : 10-90%, r load >=1k ? 2.5 5 ma 1.3.6.3 short circuit current i out_max to vsse/vdde 1 -25 25 ma 1.3.6.4 addressabl e output signal range v sr_out95 v sr_out90 @ r load >=2k ? @ r load >=1k ? 0.05 0.1 0.95 0.9 vdde 1.3.6.5 output slew rate 2 sr out c load < 50nf 0.1 v/s 1.3.6.6 output resistance in diagnostic mode r out_dia diagnostic range: <4|96>%, r load >=2k ? <8|92>%, r load >=1k ? 82 ? 1.3.6.7 load capacitance 2 c load c3 + cl (refer chapter 3 ) 150 nf 1.3.6.8 dnl dnl out -1.5 1.5 lsb 1.3.6.9 inl tqa 2 inl out best fit, r dac =12bit -5 5 lsb 1.3.6.10 inl tqe inl out best fit, r dac =12bit -8 8 lsb 1.3.6.11 output leakage current @ 150grd i leak_out in case of power or ground loss -25 25 a 1.3.7. system response 1.3.7.1 startup time 3 t sta to 1st output, f clk =3mhz, no rom check, adc: 14bit & 2nd order 5 ms 1.3.7.2 response time (100% jump) 2 t resp f clk =4mhz, 13bit, 2nd order, refer table 2.3 256 512 s 1.3.7.3 bandwidth 2 comparable to analog sscs 5 khz 1.3.7.4 analog output noise peak-to-peak 2 v noise,pp shorted inputs, gain= bandwidth ? 10khz 10 mv 1.3.7.5 analog output noise rms 2 v noise,rms shorted inputs, gain= bandwidth ? 10khz 3 mv 1 minimum output voltage to vdde or maximum output voltage to vsse 2 no measurement in mass production, parameter is guaranteed by design and/or quality observation. 3 depends on resolution and configuration - start routine begins approximately 0.8ms after power on
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 9 of 24 no. parameter symbol conditions min typ max unit 1.3.7.6 ratiometricity error re out_5 maximum error of vdde=5v to 4.5/5.5v 1000 ppm 1.3.7.7 overall failure (deviation from ideal line including inl, gain, offset & temp errors) f all tqi f all tqa f all tqe 13bit 2 nd order adc, f clk <=3mhz, xzc=0 1 , no sensor caused effects; inside of parenthesis: digital readout 0.25 (0.1) 0.5 (0.25) 1.0 (0.5) % fs 1.4. interface characteristics & eeprom no. parameter symbol conditions min typ max unit 1.4.1. i2c tm interface (refer 'zsc31150 functional description' for timing details) 1.4.1.1 input-high-level 2 v i2c_in_h 0.8 vdda 1.4.1.2 input-low-level 2 v i2c_in_l 0.2 vdda 1.4.1.3 output-low-level 2 v i2c_out_l open drain, i ol <2ma 0.15 vdda 1.4.1.4 sda load capacitance 2 c sda 400 pf 1.4.1.5 scl clock frequency 2 f scl 400 khz 1.4.1.6 internal pull-up resistor 2 r i2c 25 100 k? 1.4.2. zacwire? one wire interface (owi) 1.4.2.1 input-low-level 2 v owi_in_l 0.2 vdda 1.4.2.2 input-high-level 2 v owi_in_h 0.75 vdda 1.4.2.3 output-low-level 2 v owi_out_l open drain, i ol <2ma t.b.d. vdda 1.4.2.4 start window 2 typ: @ f clk =3mhz 96 175 455 ms 1.4.3. eeprom 1.4.3.1 ambient temperature eeprom programming 2 t amb_eep -40 150 ?c 1.4.3.2 write cycles 2 n wri_eep @write <= 85c @write up to 150c 100k 100 1.4.3.3 read cycles 2 n read_eep <=175c 3 8 * 10 8 1.4.3.4 data retention 2 t ret_eep 1300h @ 175c 4 (=100000h@55c & 27000h@125c & 3000h@150c) 15 a 1.4.3.5 programming time 2 t wri_eep per written word, f clk =3mhz 12 ms 1 xzc is active: additional overall failure of 25ppm/k for xzc=31 in maximum, failure decreases linear for xzc adjusts lower th an 31 2 no measurement in mass production, parameter is guaranteed by design and/or quality observation. 3 valid for the dice, notice additional package and temperature version caused restrictions 4 over lifetime and valid for the dice, use calculation sheet 'z mdi temperature profile calculation sheet' for temperature stre ss calculation, notice additional package and te mperature version caused restrictions
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 10 of 24 2 circuit description 2.1. signal flow the zsc31150?s signal path is partly analog and partly digi tal. the analog part is realized differentially ? this means, the differential bridge sensor signal is inter nally handled via two signal lines, which are rejected symmetrically around an internal common mode potential (analog ground = vdda/2). consequently, it is possible to amplify positive and negative input signals, which are located within the common mode range of the signal input. figure 2.1 block diagram of the zsc31150 the differential signal from the bridge sensor is pre-am plified by the programmable gain amplifier (pga). the multiplexer (mux) transmits the signal s from either the bridge sensor, t he external diode, or the separate temperature sensor, to the analog-to-digital conver ter (adc) in a certain sequence (instead of the temperature diode, the internal pn-junction (ts) can be used optionally). afterwards, the adc converts these signals into digital values. the digital signal correction takes place in the calibration microcontroller (cmc). it is based on a correction formula located in the rom and on se nsor-specific coefficients stored in the eeprom during calibration. dependent on the programmed output configuration, the co rrected sensor signal is output as an analog value or in a digital format (i2c tm or zacwire tm ). the configuration data and the correction parameters can be programmed into the eeprom via the digital interfaces. pga programmable gain amplifier mux multiplexer adc analog-to-digital converter cmc calibration microcontroller dac digital-to-analog converter bamp buffer amplifier ? output buffer opamp eeprom non volatile memory for calibra tion parameters and configuration ts on-chip temperature sensor (pn-junction) rom memory for correction formula and ?algorithm ram volatile memory for calibration parameters and configuration pga ts adc cmc rom ram eeprom dac bamp zacwire tm i 2 c mu x a nalog block digital block zsc31150 digital data i/o a nalog out
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 11 of 24 2.2. application modes for each application, a configuration set has to be est ablished (generally prior to calibration) by programming the on-chip eeprom regarding to the following modes: ? sensor channel - sensor mode: ratiometric bridge excita tion in voltage or current supply mode. - input range: the gain adjustment of the afe with respect to the maximum sensor signal span and the zero point of the adc have to be chosen. - additional offset compensation (xzc): the extended analog offset compensation has to be enabled, if required; e.g., if the sensor offset volta ge is near to or larger than the sensor span. - resolution/response time: the a/d converter has to be configured for resolution and converting scheme or adc order (first or second order). these settings influence the sampling rate and the signal integration time, and thus, the noise immunity. ? temperature - temperature measurement: the source for the temperature correction has to be chosen. 2.3. analog front end (afe) the analog front end (afe) consists of the programmabl e gain amplifier (pga), t he multiplexer (mux), and the analog-to-digital converter (adc). 2.3.1. programmable gain amplifier (pga) table 2.1 shows the adjustable gains, the sensor signal spans, and the allowed common mode range. table 2.1 adjustable gains, resulting sensor signal spans and common mode ranges input common mode range v in_cm as % of vdda 14 no. overall gain a in max. span v in_sp [mv/v] 13 gain amp1 gain amp2 gain amp3 xzc = off xzc = on 1 420 1.8 30 7 2 29 to 65 45 to 55 2 280 2.7 30 4.66 2 29 to 65 45 to 55 3 210 3.6 15 7 2 29 to 65 45 to 55 4 140 5.4 15 4.66 2 29 to 65 45 to 55 5 105 7.1 7.5 7 2 29 to 65 45 to 55 6 70 10.7 7.5 4.66 2 29 to 65 45 to 55 7 52.5 14.3 3.75 7 2 29 to 65 45 to 55 8 35 21.4 3.75 4.66 2 29 to 65 45 to 55 9 26.3 28.5 3.75 3.5 2 29 to 65 45 to 55 10 14 53.75 1 7 2 29 to 65 45 to 55 11 9.3 80 1 4.66 2 29 to 65 45 to 55 12 7 107 1 3.5 2 29 to 65 45 to 55 13 2.8 267 1 1.4 2 32 to 57 not applicable 13 recommended internal signal range is 75% of supply voltage in maximum. span is calculated by the following formula: span = 75% / gain 14 bridge in voltage mode, containing maxi mum input signal (with xzc: +300% offset), 14-bit accuracy. refer to the 'zsc31150 functional description' for usabl e input signal/common mode range at bridge in current mode.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 12 of 24 2.3.2. offset compensation the zsc311 50 supports two methods of sens or offset compensation (zero shift): ? digital offset correction ? xzc - analog compensation for large offset values (up to in maximum approximately 300% of span, depending on gain adjustment) digital sensor offset correction will be processed during the digital signal correction/conditioning by the calibration microcontroller (cmc). analog sensor offset pre-compensation will be needed for compensation of large offset values, which would overdrive the anal og signal path by uncompensated gaining. for analog sensor offset pre-compensation, a compensation voltage will be added in the analog pre-gaining signal path (coarse offset removal). the analog offset compensation in the afe can be adjusted by 6 eeprom bits. table 2.2 analog zero point shift ranges (xzc) pga gain a in max. span v in_sp [mv/v] offset shift per step in % of full span approx. maximum offset shift [mv/v] approx. maximum shift [% v in_sp ] (@ 31) 420 1.8 12.5 % 7.8 388 % 280 2.7 7.6 % 7.1 237 % 210 3.6 12.5 % 15.5 388 % 140 5.4 7.6 % 14.2 237 % 105 7.1 12,5 % 31 388 % 70 10.7 7.6 % 28 237 % 52.5 14.3 12,5 % 32 388 % 35 21.4 7.6 % 57 237 % 26.3 28.5 5.2 % 52 161 % 14 53.75 12.5 % 194 388 % 9.3 80 7.6 % 189 237 % 7 107 5.2 % 161 161 % 2.8 267 0.83 % 72 26 % 2.3.3. measurement cycle the multiplex er selects, depending on eeprom settings, the following inputs in a certain sequence. ? temperature measured by external diode or t hermistor, internal pn-junction or bridge ? internal offset of the input channel (v off ) ? pre-amplified bridge sensor signal the complete measurement cycle is contro lled by the cmc. the cycle diagram at figure 2.2 shows its prin ciple structure. the eeprom adjustable parameters are: ? n=<1,31>: pressure measurement count after power on the start routine is called, that contains all needed measurements once. remark: the tasks ?cmv?, ?ssc/scc+? and ?ssc /scc-? are contained i ndependent from eeprom configuration always in every cycle.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 13 of 24 figure 2.2: measurement cycle 2.3.4. analog-to-digital converter the adc is a n integrating ad-converter in fu ll differential switched capacitor technique. ? programmable adc-resolutions are r adc =<13, 14> and with segmentation <15, 16> bit. it can be used as first or second order converter. in the first order mode it is inherently monotone and insensitive against short and long te rm instability of the cl ock frequency. t he conversion cycle time depends on the desired resolution and can be roughly calculated by: t cyc_1 = 2 r / 2 / f clk in the secon d order mode two conversions are stacked with th e advantage of much shorter conversion cycle time and the drawback of a lower noise immunity ca used by the shorter signal integration period. the conversion cycle time at this mode is roughly calculated by: t cyc_2 = 2 (r+3)/2 / 2 / f clk the calculation formulas give an overview about conv ersion time for one ad-conversion. refer calculation sheet 'zsc31150 bandwidth calculation sheet' for detailed calculation of sampling time and bandwidth. the re sult of the ad conversion is a relative counter result corresponding to the following equation: z adc = 2 r * (v adc_diff / v adc_ref - rs adc ) z adc : number of counts (result of the conversion) r: adjusted resolution in bit v adc/ref_diff : differential input/reference voltage of adc rs adc : digital adc range shift (rs adc = 1 / 16 , 1 / 8 , 1 / 4 , 1 / 2 , controlled by the eeprom content) with the rs adc value a sensor input signal can be shift ed in the optimal input range of the adc. start routine 1 temperature auto zero ? n pressure measurement ? 1 temp measurement ? n pressure measurement ? 1 pressure auto zero ? n pressure measurement ? 1 cmv ? n pressure measurement ? 1 ssc/scc+ ? n pressure measurement ? 1 ssc/scc- ? n pressure measurement
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 14 of 24 table 2.3: analog output resolution versus sample rate adc adjustment approximated output resolution 15 sample rate f con 16 averaged bandwidth @ order digital analog f clk =3mhz f clk =3mhz f clk =4mhz r adc f clk =4mhz o adc [bit] [bit] [bit] [hz] [hz] [hz] [hz] 13 13 12 345 460 130 172 14 14 12 178 237 67 89 remark: adcs reference voltage adc vref is defined by the potential between and (or to , if cfgapp:bref=1). the theoretically input range adc range_inp of the adc is equivalent to adcs reference voltage. in practice adcs input range should be us ed in maximum from 10% to 90% of adc range_inp - a necessary condition for abiding specified accuracy, stability and nonl inearity parameters of afe. this condition is also valid for whole temperature range and all applicable sensor tolerances. inside of zsc31150 is no failsafe task implemented, which verifies abiding of this condition. 2.4. temperature measurement the zsc31150 supports four different methods for te mperature data acquiring needed for calibration of the sensor signal in temperature range. temperature data can be acquired using: ? an internal pn-junction temperature sensor, ? an external pn-junction temperature sens or connected to sensor top potential (v brtop ), ? an external resistive half bridge temperature sensor and ? the temperature coefficient of the sensor bridge at bridge current excitation. refer 'zsc31150 functional description' for a detailed explanation of temperature sensor adaptation and adju stment. 15 adc resolution should be one bit higher then applied output resolu tion, if afe gain is adjusted in such manner, that input ra nge is used more than 50%. otherwise adc resolution should be more than one bit higher than applied output resolution. 16 the sampling rate (ad conversion time) is only a part of the whole cycle, refe r ?zsc31150 bandwidth calculation sheet? for de tailed information 15 14 12 90 120 34 45 1 16 14 12 45 61 17 23 13 13 12 5859 7813 2203 2937 14 14 12 3906 5208 1469 1958 15 14 12 2930 3906 1101 1468 2 16 14 12 1953 2604 734 979
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 15 of 24 2.5. system control and conditioning calculation the system control supports t he following tasks/features: ? control the measurement cycle regarding to the eeprom-stored configuration data ? 16 bit correction calculation for each measuremen t signal using the eeprom stored calibration coefficients and rom-based algorithms = signal conditioning ? manage start up sequence and start signal conditioning ? handle communication requests received by the digital interface ? failsafe tasks for the functions of zsc31150 and message detected errors with diagnostic states refer 'zsc31150 functional description' for a detailed description. 2.5.1. operation modes the internal state machin e represents three main states: ? the continuous running signal conditioning mode ? called normal operation mode: nom ? the calibration mode with access to all internal registers and states ? called command mode: cm ? the failure messaging mode ? called diagnostic mode: dm 2.5.2. start up phase 17 the start up phase consists of following parts: 1. internal supply voltage settling phase (=potentia l vdda-vssa) ? finished by disabling the reset signal through the power on clear block (poc). refer 'zsc31150 high voltage protection description' , cha pter 4 for power on/off thresholds. time (for beginning with v dda-vssa=0v): 500s to 2000s, aout: tristate 2. system start, eeprom read out and signatur e check (and rom-check, if cfgapp:chkrom=1). time: ~200s (~9000s with rom-check ? 28180clocks ), aout: low (dm) 3. processing the start routine of signal condit ioning (all measures & conditioning calculation). time: 5x ad conversion time, aout behavior depending on adjusted owi mode (refer 2.6 ): - owi ana & owidis => aout: low (dm) - owiwin & owiena => aout: tristate the analog output aout will be activated at the en d of start up phase depend ing on adjusted output and communication mode (refer chapter 2.6 ). in case of detected errors diagnostic mode (dm) is activated and diagn ostic output signal is driven at the output. after the start up phase the continuous running measurement and calibration cycle is started. refer 'zsc31150 bandwidth calculation sheet' for detailed information about output update rate. 2.5.3. conditioning calculation the digitali zed value for pressure (acquired raw data) is processed with the correction formula to remove offset and temperature dependency and to compensate non-linearity up to 3rd order. the result of the correction calculation is a non-negative 15 bit value for pr essure (p) in the range [0; 1). this value p is clipped with programmed limitation coefficients and continuously written to the output register of the digital serial interface and the output dac. note: the conditioning includes up to third order nonli nearity sensor input correction. the available adjustment ranges depend on the specific calibration parameters, for a detailed description refer to 'zsc31150 functional description' . to give a rough idea: offset compensation and linear correction are only limited by the loose of resolution it will cause, the second order correction is possible up to about 30% full scale difference to st raight line, third order up to about 20% (adc resolution = 13bit). the used calibration principle is able to reduce present nonlinearity errors of 17 all described timings are roughly estimated values and correla tes with internal clock frequency. timings estimated for fclk=3 mhz.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 16 of 24 ulation t 2.6. analog output aout n ut the analog signal co nditioning result and for ?end of line? communication ication is enabled ation is disabled 500ms in maximum, indow ? wiana: in maximum, indow, ed) the a output p a 12.4bit 2.7. serial digital interface s igital interface (sif), which is used for communication with the circuit to c31150 functional description' for a detailed description of the se rial interfaces and communication 2.8. failsafe features, watchdog and error detection alized by changing the internal status hdog oversees the continuous working of the cmc and the running measurement loop. the operation mpar ators watching the input m- and register content - are watched the sensor up to 90%. the temperature calibrati on in cludes first and second order correction and should be fairly sufficient in all relevant case s. adc resolution influences also calibration possibilities ? 1 bit more resolution reduces cali bration range by approximately 50%. calc input data width is in maximum 14bit. 15 & 16bit adc resolution mode uses only a 14 bit segmen of adc range. the a alog output is used for outp via the zacwire tm interface (one wire communication interface - owi). the zsc31150 supports four different modes of the analog output in combination with owi behavior: ? owiena: analog output is deactivated, owi commun ? owidis: analog output is active (~2ms after po wer on), owi communic ? owiwin: analog output will be activated after time window, owi communication is enabled in time window of ~ transmission of ?start_cm? command has to be finished during time w o analog output will be activated after ~2ms power on time, owi communication is enabled in time window of ~500ms transmission of ?start_cm? command has to be finished during time w to communicate the internal driven potential at aout has to be overwritten by the external communication master (aout drive capability is current limit nalog otential is driven by a unity gain ou tput buffer, those input si gnal is generated by resistor string dac. the output buffer (bamp) ? a ra il-to-rail opamp - is offset compensated and current limited. so a short circuit of analog output to ground or power supply does not damage the zsc31150. the z c31150 includes a serial d reali ze calibration of the sensor module. the serial interface is able to communicate with two communication protocols ? i2c tm and zacwire tm (a one wire communication interface ? also called owi). the owi can be used to realize an ?end of line? calibration via the analog output aout of the complete assembled sensor module. refer 'zs proto cols. the zsc31150 detects various possible errors. a detected error is sign in diagno stic mode (dm). in this case the analog output is set to low (minimum possible output value = lower diagnostic range ? ldr) and the output registers of the digital serial interface are set to a significant error code. a watc of the internal clock oscillator is verifi ed continuously by oscillator fail detection. a check of the sensor bridge for broken wires is do ne permanently by two co voltage of ea ch input (sensor connection and short ch eck). additionally the common mode voltage of the sensor and sensor input short is watched permanently (sensor aging). different functions and blocks in digital part - like ram-, rom-, eepro continuously. refer 'zsc31150 functional description' for a detailed description of safety features and method s of error messaging.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 17 of 24 2.9. high voltage, reverse polarity and short circuit protection the zsc31150 is designed for 5v power supply operation. t he zsc31150 and the connected sensor are protected from overvoltage and reverse polarity damage by an internal supply voltage limiter. the analog output aout can be connected (short circuit, overvoltage and reverse) with all potentials in protection range unde r all potential conditions at the pins vdde and vsse. a ll external components ? explained in application circuit in chapter 3 ? are required to guarantee this operation. th e protection is no time limited. refer 'zsc31150 high voltage protection description' for a detailed d escription of protection cases and conditions.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 18 of 24 3 application circuit examples t he application circuits contain external components, which are needed for overvo ltage, reverse polarity, and short circuit protection. note: check also the available 'zsc31150 application notes' for application examples and board layout. table 3.1: application circuit parameters symbol parameter min typ max unit n otes c1 c 100 470 nf c2 c 100 nf c3 18 , 2 c 4 47 160 n f the value of c3 is the sum of the load capacitor and the cable capacitance c4, c5 19 c 0 10 nf recommended to increase emc immunity. the value of c4, c5 is the sum of the load capacitor and the cable capacitance r1 10 k ? r ibr r figure 3.1: bridge in voltage mode, external diode temperature sensor refer to chapt er 1.2 ? zsc31150 18 value of c3 summarizes l oad capacitor and cable capacity 19 higher values for c3, c4 and c5 increase emc immunity
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 19 of 24 figure 3.2: bridge in voltage mode, external thermistor figure 3.3: bridge in current mode, temperature measurement via bridge tc zsc31150 zsc31150
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 20 of 24 4 pin configuration, latch -up and esd protection 4.1. pin configuration and latch-up conditions table 4.1: pin configuration and latch-up conditions pin name description remarks usage/ connection 20 latch-up related application circuit restrictions and/or remarks 1 vdda positive analogue supply voltage analog io required/- 2 vssa negative analogue supply voltage anal og io required/- 3 sda i2c tm data io digital io, pull- up -/vdda 4 scl i2c tm clock digital in, pull-up -/vdda trigger current/voltage to vdda/vssa: +/-100ma or 8/-4v 6 vdd positive digital supply voltage analog io required or open/- only capacitor to vssa is allowed, otherwise no application access 7 vdde positive ex ternal supply voltage supply required/- t rigger current/voltage: -100ma/33v 8 vsse negative external supply voltage ground required/- 9 aout analog output & one wire if io io required/- trigger current/voltage: -100ma/33v 10 vbn negative input sensor bridge analog in required/- 11 vbr_b bridge bottom potent ial analog io required/vssa vbr_t bridge top potential analog io required/vdda depending on application circuit, short to vdda/vssa possible 13 12 vbp positive input sensor bridge analog in required/- 14 irtemp temp sensor & current source resistor analog io -/vdda, vssa depend ing on application circuit 4.2. esd-protection all pins have an esd protection of >2000v. additionally the pins vdde, vsse and aout have an esd protection of >4000v. esd protection referred to the human body model is te sted with devices in ssop14 packages during product qualification. the esd test follows the human body model with 1.5kohm/100pf based on mil 883, method 3015.7. 20 usage: if ?required? is specified, an electrical connection is necessary ? refer to the application circuits connection: to be connected to this potential, if not used or no application/configuration related constraints are given
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 21 of 24 5 package the standard package of the zsc31150 is an ssop14 green package (5.3mm body width) with a lead pitch of 0.65 mm. figure 5.1: zsc31150 pin diagram 6 quality and reliability the zsc31150 is qualified according to the aec-q100 standard, operating temperature grade 0. a fit rate <5fit (temp=55c, s=60%) is guaranteed. a typical fi t rate of the c7d-technologie, which is used for zsc31150, is 2.5fit. 7 customization for high-volume applications, which require an up- or downgraded functionality compared to the zsc31150, zmdi can customize the circuit design by adding or removing certain functional blocks. for it zmdi has a considerable library of sensor-dedicated circuitry blocks. zmdi 23456 abcd xxxx yyww 14 1 thus z mdi can provide a custom solution quickly. please contact zmdi for further information.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 22 of 24 8 ordering information product sales code description package zsc31150kit evaluation kit v1.0 modular evaluation and development boards for zsc31150 kit boards, ic samples, usb cable, dvd with software and documentation zsc31150 mass calibration system v1.1 modular mass calibration system (msc) for zsc31150 mcs boards, cable, connectors, dvd with software and documentation 9 additional documents document file name zsc31150 feature sheet zsc31150_featuresheet_rev_*.pdf zsc31150 functional description zsc31150_functionaldescription_rev_*.pdf zsc31150 high voltage protection description zsc31150_hv_prot_rev_*.pdf zsc31150 dice package zsc31150_dicepackagepin_rev_*.pdf zsc31150 bandwidth calculation sheet zsc31150_bandwidth_calculation_rev*.xls zmdi temperature profile calculation sheet zmdi _tem perature_profile_rev_*.xls zsc31150 application kit description zsc31150_applkit_rev_*.pdf zsc31150 application notes zsc31150_an*.pdf visit zmdi?s website www.zmdi.com or contact your nearest sales office for the latest version of these documents.
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 23 of 24 1 0 glossary term d escription adc analog-to-digital converter aec automotive electronics council afe analog front end aout analog output bamp buffer amplifier cm command mode cmc calibration microcontroller cmv common mode voltage cmos complementary metal oxide semiconductor dac digital-to-analog converter dm diagnostic mode eeprom electrically erasable programmable read only memory esd electrostatic device ldr lower diagnostic range mux multiplexer nom no rmal operation mode owi one wire interface p pressure pga programmable gain amplifier poc power on clear ram random-access memory risc reduced instruction set computer rom read only memory scc sensor connection check sif serial interface ssc+ positive-biased sensor short check ssc- negative-biased sensor short check ts temperature sensor xzc extended zero compensation
zsc31150 fast automotive sensor signal conditioner data sheet august 16, 2011 ? 2011 zentrum mikroelektronik dresden ag ? rev. 1.08 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. 24 of 24 11 document revision history revision date description 0.46 june 12, 2008 first release after format update 0.47 july 20, 2008 update after review 1.01 september 20, 2008 ?6.? ? fit rate added ?1.5.2? ? rom check ti me revised/corrected ?5.3.4.3? ? ssc ? no detection limit added 1.02 september 20, 2009 adjust to new zmdi template 1.03 october 2, 2009 chan ge to zmdi denotation 1.04 october 22, 2009 formatting and linking issues solved 1.05 february 26, 2010 adjust to new zmdi template include 'zsc31150 feature sheet' at page 2&3 add or dering codes for zsc31150 and evaluation kits extend glossary add new phone number for zmd far eas t, ltd. and zmda america office madison jul y 29, 2010 correct ?offset shift per step? and ?a pprox. maximum o ffset shift? in table 2.2 for pga gain = 105 and 52.5 1.06 move 1.4.1.6 ?internal pull-up re sistor? into chapter 1.4.1 in table 1.2 redra wing of sensor bridge in figure 3.1 , figure 3.2 and figure 3.3 add comm ent for c4 and c5 in figure 3.3 renam e zmd31150 to zsc31150 con nection of r ibr in figure 3.3 corrected 1.07 august 31, 2 010 1.08 au gust 15, 2011 update ordering info rmation with ?long life automotive? (refer ordering information and chapter 8 ) sales and further information www.zmdi.com ssc@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei 2nd floor, shinbashi tokyu bldg. 4-21-3, s hinbashi, minato-ku tokyo, 105-0004 japan g ermany taiwan phone +49 (0)351.8822.7.772 fax +49(0)351.8822.87.772 phone +01 (608) 829-1987 fax +01 (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 hereby 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, ind irect, incidental, 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. z md ag hereby expressly disclaims 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 damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warrant y, tort (including negligence), strict liability, or otherwise.
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