ZMD31150 Fast Automotive Sensor Signal Conditioner Datasheet PRELIMINARY Features Brief Description • Digital compensation of sensor offset, sensitivity, temperature drift and non-linearity • Adjustable to nearly all bridge sensor types, analog gain: 420, over all gain: up to 2000 • Output options: ratiometric analog voltage output (5-95% in maximum, 12.4bit resolution) TM or ZACwire (digital one-wire-interface) • Temperature compensation: internal or external diode, bridge resistance, thermistor • Sensor biasing by voltage or constant current • Sample rate up to 7.8kHz • High voltage protection up to 33V • Reverse polarity and short circuit protection • Wide operation temperature –40...+150°C • Supply voltage 4.5...5.5V • Traceability by user-defined EEP entries • Several safety- and diagnostic functions ZMD31150 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 a 16-bit RISC micro-controller running a correction algorithm with calibration coefficients stored in an EEPROM. The ZMD31150 is adjustable to nearly all bridge sensor types. Measured values are provided at the ratiometric analog voltage output or at the digital ZACwireTM and I2C 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 ZMD31150 are mated digitally: fast, precise and without the cost overhead associated with trimming by external devices or laser. Benefits • No external trimming components required • PC-controlled configuration and One-Shot calibration via one-wire interface: simple, low cost, quick and precise • End-of-Line calibration via one-wire-interface • High accuracy (0.25% FSO @ -25 to 85°C; 0.5% FSO @ -40 to 125°C) The ZMD31150 is optimized for automotive environments by it’s special protection circuitry and excellent electromagnetic compatibility. • Evaluation kit available with samples • Mass calibration solution • Customization possible for large production volumes VDD Sensor Module ZMD 31150 OUT GND Fig 1: Sensor Module Schematic Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 1/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet PRELIMINARY Contents 1. CIRCUIT DESCRIPTION ........................................................................................................... 3 1.1 SIGNAL FLOW ........................................................................................................................... 3 1.2 APPLICATION MODES ................................................................................................................ 4 1.3 ANALOG FRONT END (AFE)....................................................................................................... 4 1.3.1. Programmable Gain Amplifier........................................................................................... 4 1.3.2. XZC - Analog Sensor Offset Compensation ..................................................................... 5 1.3.3. Measurement Cycle.......................................................................................................... 6 1.3.4. Analog-to-Digital Converter .............................................................................................. 6 1.4 TEMPERATURE MEASUREMENT .................................................................................................. 7 1.5 SYSTEM CONTROL AND CONDITIONING CALCULATION ................................................................. 8 1.5.1. Operation Modes .............................................................................................................. 8 1.5.2. Start Up Phase ................................................................................................................. 8 1.5.3. Conditioning Calculation ................................................................................................... 9 1.6 ANALOG OUTPUT AOUT ........................................................................................................... 9 1.7 SERIAL DIGITAL INTERFACE ..................................................................................................... 10 1.8 SAFETY FEATURES, W ATCHDOG AND ERROR DETECTION ......................................................... 10 1.9 HIGH VOLTAGE, REVERSE POLARITY AND SHORT CIRCUIT PROTECTION .................................... 10 2. APPLICATION CIRCUIT EXAMPLE........................................................................................ 11 3. ESD-PROTECTION ................................................................................................................. 12 4. PIN CONFIGURATION, LATCH-UP AND PACKAGE ............................................................. 12 5. IC CHARACTERISTICS........................................................................................................... 13 5.1 5.2 5.3 5.4 ABSOLUTE MAXIMUM RATINGS................................................................................................. 13 OPERATING CONDITIONS ......................................................................................................... 13 ELECTRICAL PARAMETERS ...................................................................................................... 14 INTERFACE CHARACTERISTICS & EEPROM ............................................................................. 16 6. RELIABILITY ........................................................................................................................... 17 7. CUSTOMIZATION ................................................................................................................... 17 8. RELATED DOCUMENTS......................................................................................................... 17 Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 2/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1. Circuit Description 1.1 Signal Flow PRELIMINARY Fig.2: Block diagram of ZMD31150 The ZMD31150’s signal path is partly analog (blue) and partly digital (red). The analog part is realized differential – this means the differential bridge sensor signal is internal handled via two signal lines, which are rejected symmetrically around a common mode potential (analog ground = VDDA/2). Consequently it is possible to amplify positive and negative input signals, which are located in the common mode range of the signal input. The differential signal from the bridge sensor is pre-amplified by the programmable gain amplifier (PGA). The Multiplexer (MUX) transmits the signals from bridge sensor, external diode or separate temperature sensor to the ADC in a certain sequence (instead of the temp. diode the internal pnjunction (TS) can be used optionally). Afterwards the ADC converts these signals into digital values. The digital signal correction takes place in the calibration micro-controller (CMC). It is based on a correction formula located in the ROM and on sensor-specific coefficients (stored into the EEPROM during calibration). Dependent on the programmed output configuration the corrected sensor signal is output as analog value or in digital format (I2C, ZACwireTM ). The configuration data and the correction parameters can be programmed into the EEPROM via the digital interfaces. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 3/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1.2 PRELIMINARY Application Modes For each application a configuration set has to be established (generally prior to calibration) by programming the on-chip EEPROM regarding to the following modes: Sensor channel Sensor mode: ratiometric bridge excitation 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 has to be chosen − Additional offset compensation XZC: the extended analog offset compensation has to be enabled if required, e.g. if the sensor offset voltage 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, signal integration time and this way the noise immunity. Temperature − Temperature measurement: the source for the temperature correction has to be chosen. − − 1.3 Analog Front End (AFE) The analog front end consists of the PGA, the MUX and the ADC. 1.3.1. Programmable Gain Amplifier Table 1 shows the adjustable gains, the sensor signal spans and the allowed common mode range. No. overall Max. span gain VIN_SP aIN [mV/V] 1 Gain Amp1 Gain Amp2 Gain Amp3 Input common mode range VIN_CM in % VDDA2 XZC=off XZC=on 1 420 1,8 30 7 2 29 … 65 45…55 2 280 2,7 30 4,66 2 29 … 65 45…55 3 210 3,6 15 7 2 29 … 65 45…55 4 140 5,4 15 4,66 2 29 … 65 45…55 5 105 7,1 7,5 7 2 29 … 65 45…55 6 70 10,7 7,5 4,66 2 29 … 65 45…55 7 52,5 14,3 3,75 7 2 29 … 65 45…55 8 35 21,4 3,75 4,66 2 29 … 65 45…55 9 26,3 28,5 3,75 3,5 2 29 … 65 45…55 10 14 53,75 1 7 2 29 … 65 45…55 11 9,3 80 1 4,66 2 29 … 65 45…55 12 7 107 1 3,5 2 29 … 65 45…55 13 2,8 267 1 1,4 2 32 … 57 Table 1: Adjustable gains, resulting sensor signal spans and common mode ranges 1 Recommended internal signal range is 75% of supply voltage in maximum. Span is calculated by formula: span = 75%*VDDA / gain 2 Bridge in voltage mode, containing maximum input signal (with XZC: +300% Offset), 14bit accuracy refer “ZMD31150 Functional description” for usable input signal/common mode range at bridge in current mode Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 4/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1.3.2. PRELIMINARY XZC - Analog Sensor Offset Compensation The ZMD31150 supports two methods of sensor 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 at the digital signal correction/conditioning by the CMC. Analog sensor offset pre-compensation will be needed for compensation of large offset values, which would be overdrive the analog 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. PGA gain aIN 420 280 210 140 105 70 52,5 35 26,3 14 9,3 7 2,8 Max. span VIN_SP in mV/V 1,8 2,7 3,6 5,4 7,1 10,7 14,3 21,4 28,5 53,75 80 107 267 Offset shift per step in % full span 12,5% 7,6% 12,5% 7,6% 5,2% 7,6% 5,2% 7,6% 5,2% 12,5% 7,6% 5,2% 0,83% Approx. maximum Approx. maximum offset shift in mV/V shift in [% VIN_SP] (@ ± 31) 7,8 7,1 15,5 14,2 13 28 26 57 52 194 189 161 72 388% 237% 388% 237% 388% 237% 388% 237% 161% 388% 237% 161% 26% Table 2: Analog Zero Point Shift Ranges (XZC) Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 5/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1.3.3. PRELIMINARY Measurement Cycle The Multiplexer selects, depending on EEPROM settings, the following inputs in a certain sequence. Temperature measured by external diode or thermistor, internal pn-junction or bridge Internal offset of the input channel (VOFF) Pre-amplified bridge sensor signal The complete measurement cycle is controlled by the CMC. The cycle diagram at the right shows its principle structure. The EEPROM adjustable parameters are: • n=<1,31>: Pressure measurement count After power on the start routine is called, which contains all needed measurements once. Remark: The tasks “CMV”, “SSC/SCC+” and “SSC/SCC-“ are contained independent from EEPROM configuration always in cycle. 1.3.4. Analog-to-Digital Converter → 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 The ADC is an integrating AD-Converter in full differential switched capacitor technique. Programmable ADC-resolutions are rADC=<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 term instability of the clock frequency. The conversion cycle time depends on the desired resolution and can be roughly calculated by: r tCYC_1 = 2 µs / 2 / fCLK In the second order mode two conversions are stacked with the advantage of much shorter conversion cycle time and the drawback of a lower noise immunity caused by the shorter signal integration period. The conversion cycle time at this mode is roughly calculated by: tCYC_2 = 2(r+3)/2 / 2 / fCLK The calculation formulas give a overview about conversion time for one AD-conversion. Refer Calculation sheet “ZMD31150_Bandwidth_Calculation_Rev*.xls” for detailed calculation of sampling time and bandwidth. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 6/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet PRELIMINARY The result of the AD conversion is a relative counter result corresponding to the following equation: r ZADC = 2 * (VADC_DIFF / VADC_REF - RSADC) ZADC: r: VADC/REF_DIFF: RSADC: number of counts (result of the conversion) adjusted resolution in bit differential input/reference voltage of ADC digital ADC Range Shift (RSADC = 1/16, 1/8, 1/4, 1/2, controlled by the EEPROM content) With the RSADC value a sensor input signal can be shifted in the optimal input range of the ADC. ADC Adjustment Order rADC OADC Bit 1 13 1 14 1 15 1 16 2 13 2 14 2 15 2 16 approx. Output Sample Rate Averaged Resolution *1) fCON *2) Bandwidth @ Digital Analog fCLK=3MHz fCLK=4MHz fCLK=3MHz fCLK=4MHz Bit Bit Hz Hz Hz Hz 13 12 345 460 130 172 14 12 178 237 67 89 14 12 90 120 34 45 14 12 45 61 17 23 13 12 5859 7813 2203 2937 14 12 3906 5208 1469 1958 14 12 2930 3906 1101 1468 14 12 1953 2604 734 979 Table 3: Output resolution versus sample rate *1) ADC resolution should be one bit higher then applied output resolution, if AFE gain is adjusted in such manner, that input range is used more than 50%. Otherwise ADC resolution should be more than one bit higher than applied output resolution. *2) The sampling rate (AD conversion time) is only a part of the whole cycle, refer “ZMD31150 bandwidth calculation sheet” for detailed information Remark: ADCs reference voltage ADCVREF is defined by the potential between <VBR_T> and <VBR_B> (or <VDDA> to <VSSA>, if CFGAPP:BREF=1). The theoretically input range ADCRANGE_INP of the ADC is equivalent to ADCs reference voltage. In practice ADCs input range should be used in maximum from 10% to 90% of ADCRANGE_INP - a necessary condition for abiding specified accuracy, stability and nonlinearity parameters of AFE. These condition is also valid for whole temperature range and all applicable sensor tolerances. Inside of ZMD31150 is no failsafe task implemented, which verifies abiding of these condition. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 7/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1.4 PRELIMINARY Temperature Measurement The ZMD31150 supports four different methods for temperature 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 sensor connected to sensor top potential (VBRTOP), an external resistive half bridge temperature sensor and the temperature coefficient of the sensor bridge at bridge current excitation. • • • • Refer “ZMD31150 Functional Description” for a detailed explanation of temperature sensor adaptation and adjustment. 1.5 System Control and Conditioning Calculation The system control supports the following tasks/features: • • • • • control the measurement cycle regarding to the EEPROM-stored configuration data 16 bit correction calculation for each measurement 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 serial interface failsafe tasks for the functions of ZMD31150 and message detected errors with diagnostic states Refer “ZMD31150_FunctionalDescription_Rev_*.PDF” for a detailed description. 1.5.1. Operation Modes The internal state machine 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 1.5.2. 1 Start Up Phase The start up phase consist of following parts: 1 internal supply voltage settling phase (=potential VDDA-VSSA) – finished by disabling the reset signal through the power on clear block (POC). Refer “ZMD31150_HighVoltageProt_Rev_*.PDF”, chapter 4 for power on/off thresholds. Time (for beginning with VDDA-VSSA=0V): 500µs to 2000µs, AOUT: tristate 2 system start, EEPROM read out and signature check (and ROM-check, if CFGAPP:CHKROM=1). Time: ~200µs (~2000µs with ROM-check), AOUT: LOW (DM) 3 processing the start routine of signal conditioning (all measures & conditioning calculation). Time: 5x AD conversion time, AOUT behavior depending on adjusted OWI mode (1.6): - OWIANA & OWIDIS => AOUT: LOW (DM) - OWIWIN & OWIENA => AOUT: tristate 1 All described timings are roughly estimated values and correlates with internal clock frequency. Timings estimated for fclk=3MHz. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 8/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet PRELIMINARY The analog output AOUT will be activated at the end of start up phase depending on adjusted output and communication mode (1.6). In case of detected errors Diagnostic Mode (DM) is activated and diagnostic output signal is driven at the output. After the start up phase the continuous running measurement and calibration cycle is started. Refer “ZMD31150_BandwidthCalculation_Rev_*.xls” for detailed information about output update rate. 1.5.3. Conditioning Calculation The digitalized value for pressure (acquired raw data) is processed with the correction formula to rd remove offset and temperature dependency and to compensate non-linearity up to 3 order. The result of the correction calculation is a non-negative 15 Bit value for pressure (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 nonlinearity sensor input correction. The available adjustment ranges depend on the specific calibration parameters, for a detailed description refer to “ZMD31150 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 straight line, third order up to about 20% (ADC resolution = 13bit). The used calibration principle is able to reduce present nonlinearity errors of the sensor up to 90%. The temperature calibration includes first and second order correction and should be fairly sufficient in all relevant cases. ADC resolution influences also calibration possibilities – 1 bit more resolution reduces calibration range by approximately 50%. Calculation input data width is in maximum 14bit. 15 & 16bit ADC resolution mode uses only a 14 bit segment of ADC range. 1.6 Analog Output AOUT The analog output is used for output the analog signal conditioning result and for “End of Line” communication via the ZACwireTM interface (one wire communication interface - OWI). The ZMD31150 supports four different modes of the analog output in combination with OWI behavior: • • • • OWIENA: analog output is deactivated, OWI communication is enabled OWIDIS: analog output is active (~2ms after power on), OWI communication is disabled OWIWIN: analog output will be activated after time window, OWI communication is enabled in time window of ~500ms in maximum, transmission of “START_CM” command has to be finished during time window OWIANA: analog output will be activated after ~2ms power on time, OWI communication is enabled in time window of ~500ms in maximum, transmission of “START_CM” command has to be finished during time window, to communicate the internal driven potential at AOUT has to be overwritten by the external communication master (AOUT drive capability is current limited) The analog output potential is driven by an unity gain output buffer, those input signal is generated by an 12.4bit resistor string DAC. The output buffer (BAMP) – a rail-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 ZMD31150. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 9/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 1.7 PRELIMINARY Serial Digital Interface The ZMD31150 includes a serial digital interface (SIF), which is used for communication with the circuit to realize calibration of the sensor module. The serial interface is able to communicate with two 2 TM TM communication protocols – I C and ZACwire (an one wire communication interface – also called OWI). The OWI can be used to realize a “End of Line” calibration via the analog output AOUT of the complete assembled sensor module. Refer “ZMD31150 Functional Description” for a detailed description of the serial interfaces and communication protocols. 1.8 Failsafe Features, Watchdog and Error Detection The ZMD31150 detects various possible errors. A detected error is signalized by changing the interal status in diagnostic 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 watchdog oversees the continuous working of the CMC and the running measurement loop. The operation of the internal clock oscillator is verified continuously by oscillator fail detection. A check of the sensor bridge for broken wires is done permanently by two comparators watching the input voltage of each input (sensor connection and short check). 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-, EEPROM- and register content - are watched continuously. Refer “ZMD31150 Functional Description” for a detailed description of safety features and methods of error messaging. 1.9 High Voltage, Reverse Polarity and Short Circuit Protection The ZMD31150 is designed for 5V power supply operation. The ZMD31150 and the connected sensor is 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 under all potential conditions at the pins VDDE and VSSE. All external components – explained in application circuit in chapter 2 – are required to guarantee these operation, the protection is no time limited. Refer “ZMD31150 High Voltage Protection Description” for a detailed description of protection cases and conditions. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 10/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 2. PRELIMINARY Application Circuit Example Example 1: Bridge in voltage mode, ext. diode temp sensor Example 2: Bridge in voltage mode, external thermistor SYM BOL PARA METER MIN C1 C 100 C2 C 100 C3 C 4 C4, C5 C 0 R1 RIBR R TYP MAX UNIT 470 nF nF 47 160 nF 10 nF 10 kOhm refer 5.2.8 Ohm Table 4: Application Circuit Parameters Example 3 Bridge in current mode, temp via bridge TC The application circuits contain external components, which are needed for overvoltage, reverse polarity and short circuit protection. Higher values for C3, C4 & C5 increases EMC immunity. Notice: Value of C3 summarizes load capacitor and cable capacity. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 11/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 3. PRELIMINARY 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 tested 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. 4. Pin Configuration, Latch-Up and Package Pin Name Description Remarks Usage/ Connection 1 Latch-Up related Application Circuit Restrictions and/or Remarks 9 AOUT Analog output & one wire IF IO IO Required/- Trigger Current/Voltage: -100mA/33V 7 VDDE Positive external supply voltage Supply Required/- Trigger Current/Voltage: -100mA/33V 6 VDD Positive digital supply voltage Analog IO only capacitor to VSSA is allowed, otherwise no application access 8 VSSE Negative external supply voltage Ground Required or open/Required/- 4 SCL I²C clock Digital IN, pullup -/VDDA 3 SDA I²C data IO Digital IO, pullup -/VDDA Trigger Current/Voltage to VDDA/VSSA: +/-100mA or 8/-4V 2 VSSA Negative analogue supply voltage Analog IO Required/- 1 VDDA Positive analogue supply voltage Analog IO Required/- 13 VBR_T Bridge top potential Analog IO Required/VDDA 11 VBR_B Bridge bottom potential Analog IO Required/VSSA Depending on application circuit, short to VDDA/VSSA possible 14 IRTEMP Temp sensor & current source resistor VBP Positive input sensor bridge Analog IO -/VDDA, VSSA Depending on application circuit Analog IN Required/- Analog IN Required/- 12 10 VBN Negative input sensor bridge Table 4: Pin Configuration and Latch-Up Conditions ZMD31150 is packaged in a SSOP14 green package (5.3mm body width) with a lead-pitch 0.65mm: 1 Pin-Nr Pin-Name Pin-Name Pin-Nr 8 VSSE VDDE 7 9 AOUT VDD 6 10 VBN n.c. 5 11 VBR_B SCL 4 12 VBP SDA 3 13 VBR_T VSSA 2 14 IRTEMP VDDA 1 Usage: If “Required” is notified a electrical connection is necessary – refer application circuit Connection: to be connected to this potential, if not used or no application/configuration related constrains are given Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 12/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet PRELIMINARY 5. IC Characteristics 5.1 Absolute Maximum Ratings In operation temperature range and without time limitations. No. Parameter 5.1.1 Supply Voltage 1 Symbol min VDDEAMR -33 typ Max 33 Unit Conditions V DC to VSSE, refer chapter 2 for application circuits Potential at Pin AOUT 1 related to VSSE VOUT -33 33 V DC VDDAAMR -0.3 6.5 V DC related to VSSA, VDDE–VDDA < 0.35V 5.1.4 Voltage at all analog and digital IO – Pins VA_IO, VD_IO -0.3 VDDA +0.3 5.1.5 Storage temperature TSTG -55 150 5.1.2 5.1.3 Analog Supply Voltage 5.2 1 V DC related to VSSA °C Operating Conditions All Voltages related to VSSA. No. Parameter Symbol min TAMB -40 150 2 °C TQE 5.2.2 Ambient temperature advanced performance * TAMB_TQA -40 125 °C TQA 5.2.3 Ambient temperature advanced performance * TAMB_TQI -25 85 °C TQI VDDE 4.5 5.2.5 Bridge Resistance *, 3 RBR_V 2.0 3 RBR_C 5.2.1 Ambient temperature 2 5.2.4 Supply Voltage 5.2.7 Bridge Resistance *, typ 5.0 max Unit Conditions 5.5 V DC 25.0 kΩ Bridge Voltage Mode 10 kΩ Bridge Current Excitation, notice IBR_MAX 5.2.8 Resistor RIBR * RIBR 5.2.9 Maximum Bridge Current IBR_MAX 5.2.10 Maximum Bridge Top Voltage VBR_TOP 5.2.11 TC Current Reference Resistor * TK RIBR RBR IBR=VDDA/(16·RIBR) 0.07 15 16 50 2 mA ·VVDDA - 0.3 V ppm behaviour influences /K generated current * no measurement in mass production, parameter is guarantied by design and/or quality observation 1 refer “ZMD31150_HighVoltageProt_Rev_*.PDF” for specification and detailed conditions 2 notice temperature profile description in “ZMD31150_DiceAndPackage_Rev_*.PDF” for operation in temperature range >125°C 3 Symmetric behaviour and identical electrical properties (especially with regard to the low pass characteristic) of both sensor inputs of the ZMD31150 is required. Unsymmetric conditions of the sensor and/or external components connected to the sensor input pins of ZMD31150 can generate a failure in signal operation. Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 13/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 5.3 PRELIMINARY Electrical Parameters All parameter values are valid on behalf on in chapter 5.2 specified operating conditions (special definitions excluded). All Voltages related to VSSA. No. Parameter Symbol min typ max Unit Conditions 5.3.1 Supply Current and System Operation Conditions 5.3.1.1 Supply current IVDDE 5.3.1.2 Clock frequency fCLK 5.5 2 * 3 4 * mA without bridge and load current, fCLK ≤ 3MHz MHz guaranteed adjustment range 5.3.2 AFE (refer chapter 1.3) 5.3.2.1 Input Span 5.3.2.2 Analog Offset Compensation Range 5.3.2.3 Parasitic differential input offset current ∗ 5.3.2.4 Common mode input range 1 275 mV/V analog gain: 420…2.8 -300 300 % VIN_SP depends on gain adjust, refer 1.3.2 IIN_OFF -2 -10 2 10 nA VIN_CM 0.29 0.65 VDDA VIN_SP TAMB_TQI depends on gain adjust, no XZC, refer 1.3.1 5.3.3 Temperature Measurement (refer chapter 0) 5.3.3.1 External temperature diode channel gain ATSED 300 5.3.3.2 External temperature diode bias current ITSE 6 5.3.3.3 External temperature diode input range * 0 5.3.3.4 External temperature resistor channel gain ATSER 1200 5.3.3.5 External temperature resistor input range * VTSER 0 5.3.3.7 Internal temperature diode sensitivity STTSI 700 1300 ppm FS / mV 10 20 µA 1.5 V 3500 ppm FS / (mV/V) 600 mV/V 2700 ppm FS raw values – without /K conditioning 5.3.4 Sensor Connection Check 5.3.4.1 Sensor connection loss 5.3.4.2 Sensor input short ∗ 100 50 kΩ detection threshold Ω detection threshold no measurement in mass production, parameter is guarantied by design and/or quality observation Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 14/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet No. PRELIMINARY Parameter Symbol min typ max Unit Conditions 5.3.5 AD-Conversion 5.3.5.1 A/D Resolution * rADC 13 16 Bit 5.3.5.2 DNL * DNLADC 0.95 LSB 5.3.5.3 INL TQA * INLADC 4 LSB 5.3.5.4 INL TQE INLADC 5 LSB 5.3.5.5 ADC Input Range Range 90 %VDDA 10 rADC =13Bit, fCLK=3MHz, best fit, 2nd order, complete AFE, 5.3.5.5 5.3.6 DAC & Analog Output (Pin AOUT) 5.3.6.1 D/A Resolution rDAC Bit analog output, 10-90% 2.5 5 mA Vout: 5-95%, RLOAD>=2kΩ Vout: 10-90%, RLOAD>=1kΩ to VSSE/VDDE 12 5.3.6.2 Output current sink and source for VDDE=5V ISRC/SINK_ 5.3.6.3 Short circuit current IOUT_max -25 25 mA 5.3.6.4 Addressable output signal range VSR_OUT95 VSR_OUT90 0.05 0.1 0.95 0.9 VDDE @ RLOAD>=2kΩ @ RLOAD>=1kΩ SROUT 0.1 V/µs CLOAD < 50nF 5.3.6.5 Output slew rate * OUT 1 5.3.6.6 Output resistance in diagnostic mode ROUT_DIA 82 Ω Diagnostic Range: <4/>96%, RLOAD>=2kΩ <8/>92%, RLOAD>=1kΩ 5.3.6.7 Load capacitance * CLOAD 150 nF C3 + CL (refer chapter 2) 5.3.6.8 DNL DNLOUT -1.5 1.5 LSB 5.3.6.9 INL TQA * INLOUT -5 5 LSB best fit, rDAC =12Bit 5.3.6.10 INL TQE INLOUT -8 8 LSB best fit, rDAC =12Bit ILEAK_OUT -25 25 µA 5.3.6.11 Output Leakage current @ 150grd in case of power or ground loss 5.3.7 System Response 5.3.7.1 Startup time 2 tSTA 5 ms to 1st output, fclk=3MHz, no ROM check, ADC: 14bit & 2nd order 5.3.7.2 Response time (100% jump) * tRESP 256 5.3.7.3 Bandwidth * 512 5 µs fCLK=4MHz, 13Bit, 2nd order, refer chapter 0 kHz comparable to analog SSCs 1 minimum output voltage to VDDE or maximum output voltage to VSSE 2 Depends on resolution and configuration - start routine begins approximately 0.8ms after power on * no measurement in mass production, parameter is guarantied by design and/or quality observation Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 15/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet PRELIMINARY 5.3.7.4 Analog Output Noise Peak-to-Peak * VNOISE,PP 5.3.7.5 Analog Output Noise RMS * 5.3.7.6 Ratiometricity Error VNOISE,RMS 10 bandwidth ≤ 10kHz 3 No. mV shorted inputs, gain= bandwidth ≤ 10kHz 1000 ppm maximum error of REOUT_5 VDDE=5V to 4.5/5.5V % 13Bit 2nd order ADC, fclk<=3MHz, FS XZC=0 1, no sensor caused effects; 0.25 (0.1) 0.5 (0.25) 1.0 (0.5) 5.3.7.7 Overall failure (deviation FALL TQI from ideal line including INL, FALL TQA gain, offset & temp errors) FALL TQE 5.4 mV shorted inputs, gain= inside of parenthesis: digital readout Interface Characteristics & EEPROM Parameter Symbol min typ max Unit Conditions 2 5.4.1 I C Interface (refer ZMD31150_FD_Rev_*.pdf for timing details) 5.4.1.1 Input-High-Level * VI2C_IN_H 5.4.1.2 Input-Low-Level * VI2C_IN_L 0.2 VDDA VI2C_OUT_L 0.15 VDDA 5.4.1.4 SDA load capacitance * CSDA 400 pF 5.4.1.5 SCL clock frequency * fSCL 400 kHz 5.4.1.6 Internal pullup resistor * RI2C 100 kΩ 5.4.1.3 Output-Low-Level * 0.8 VDDA 25 Open Drain, IOL<2mA 5.4.2 ZACwire™ One Wire Interface (OWI) 5.4.2.1 5.4.2.2 5.4.2.3 5.4.2.4 Input-Low-Level * Input-High-Level * Output-Low-Level * Start Window * VOWI_IN_L 0.2 VOWI_IN_H 0.75 VOWI_OUT_L t.b.d. 96 175 455 5.4.3 EEPROM 5.4.3.1 Ambient temperature EEPROM programming * 5.4.3.2 Write cycles * TAMB_EEP 5.4.3.3 Read cycles * nREAD_EEP 100k 100 8 8 * 10 tRET_EEP 15 5.4.3.4 Data retention * 5.4.3.5 Programming time * -40 150 nWRI_EEP tWRI_EEP VDDA VDDA VDDA ms Open Drain, IOL<?mA typ: @ fclk=3MHz °C @write <= 85°C @write up to 150°C 2 <=175°C 3 a 1300h @ 175°C (=100000h@55°C & 27000h@125°C & 3000h@150°C) 12 ms per written word, fclk=3MHz 1 XZC is active: additional overall failure of 25ppm/K for XZC=31 in maximum, failure decreases linear for XZC adjusts lower than 31 * no measurement in mass production, parameter is guarantied by design and/or quality observation 2 valid for the dice, notice additional package and temperature version caused restrictions 3 over lifetime and valid for the dice, use calculation sheet “ZMD_TempProfile_Rev_*.xls” for temperature stress calculation, notice additional package and temperature version caused restrictions Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 16/17 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 preliminary and subject to changes without notice. ZMD31150 Advanced Automotive Sensor Signal Conditioner Datasheet 6. PRELIMINARY Reliability The ZMD31150 is qualified according to the AEC-Q100 standard, operating temperature grade 0. 7. Customization For high-volume applications, which require an up- or downgraded functionality compared to the ZM31150, ZMD can customize the circuit design by adding or removing certain functional blocks. For it ZMD has a considerable library of sensor-dedicated circuitry blocks. Thus ZMD can provide a custom solution quickly. Please contact ZMD for further information. 8. Related Documents • ZMD31150_FeatureSheet _Rev_*.PDF • ZMD31150_FunctionalDescription _Rev_*.PDF • ZMD31150_HighVoltageProt_Rev_*.PDF • ZMD31150_DicePackagePin_Rev_*.PDF • ZMD31150_BandwidthCalculation_Rev_*.xls • ZMD31150 Application Kit Description - ZMD31150_APPLKIT_Rev_*.PDF • ZMD31150 Application Notes - ZMD31150_AN*.PDF This information applies to a product under development. Its characteristics and specifications are subject to change without notice. ZMD assumes no obligation regarding future manufacture unless otherwise agreed in writing. The information furnished hereby is believed to be correct and accurate. However, ZMD shall not be liable to any customer, licensee or any other third party for any damages in connection with or arising out of the furnishing, performance or use of this technical data. No obligation or liability to any customer, licensee or any other third party shall result from ZMD’s rendering of technical or other services. For further information: ZMD AG Grenzstrasse 28 01109 Dresden, Germany Phone +49 (0)351-8822-366 Fax +49 (0)351-8822-337 [email protected] www.zmd.biz ZMD America, Inc. 201 Old Country Road, Suite 204 Melville, NY 11747, USA Phone +01 (631) 549-2666 Fax +01 (631) 549-2882 [email protected] www.zmd.biz ZMD America, Inc. 15373 Innovation Drive, Suite 110 San Diego, CA 92128, USA Phone +01 (858) 674-8070 Fax +01 (858) 674-8071 [email protected] www.zmd.biz Copyright © 2007, ZMD AG, Rev. 1.00, 2008-06-04 17/17 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 preliminary and subject to changes without notice.