ZSC31150FLB-R_技术文档

Data Sheet

Rev. 1.08 / August 2011

ZSC31150

Fast Automotive Sensor Signal Conditioner

ZSC31150

Fast Automotive Sensor Signal Conditioner

Brief Description

Benefits

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,

 No external trimming components required

 Only a few external protection devices needed

 PC-controlled configuration and One-Shot

calibration via I²C^TMor ZACwire^TMinterface:

Simple, cost efficient, quick, and precise

 End-of-Line calibration via I²C^TMor ZACwire^TM

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.

interface

 High accuracy (0.25% FSO @ -25 to 85°C;

0.5% FSO @ -40 to 125°C)

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^TMinterface. The digital interface can be

 The ZSC31150 is optimized for automotive

environments by its special protection circuitry

and excellent electromagnetic compatibility

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.

Available Support

 Evaluation Kits

 Application Notes

 Mass calibration setup

Physical Characteristics

Features

 Supply voltage 4.5 to 5.5 V

 Digital compensation of sensor offset,

sensitivity, temperature drift, and non-linearity

 Operation temperature: -40°C to 125°C

(-40°C to +150°C derated, depending on

product version)

 Adjustable to nearly all bridge sensor types,

analog gain of 420, overall gain up to 2000

 Available in SSOP14 or as die

 Output options: ratiometric analog voltage

output (5 - 95% in maximum, 12.4 bit

resolution) or ZACwire^TM(digital one-wire-

interface)

ZSC31150 Application Circuit

 Temperature compensation: internal or external

diode, bridge resistance, thermistor

VCC

 Sensor biasing by voltage or constant current

 Sample rate up to 7.8 kHz

Sensor

Module

 High voltage protection up to 33 V

OUT

 Supply current: max. 5.5mA

ZSC

31150

 Reverse polarity and short circuit protection

 Wide operation temperature up to -40…+150°C

 Traceability by user-defined EEPROM entries

 Several safety and diagnostic functions

GND

The information furnished in this publication is subject to changes without notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

ZSC31150 Block Diagram

ZACwire^TM

I²C

RAM

EEPROM

Digital

Data I/O

Analog

Out

PGA

TS

ADC

CMC

DAC

BAMP

ROM

Analog Block

Digital Block

ZSC31150

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

Modular Mass Calibration System (MSC) for

MCS boards, cable, connectors,

Calibration System V1.1 ZSC31150

DVD with software and documentation

Sales and Further Information

www.zmdi.com

SSC@zmdi.com

ZMD Far East, Ltd.

3F, No. 51, Sec. 2,

Keelung Road

11052 Taipei

Taiwan

Zentrum Mikroelektronik

Dresden AG

Grenzstrasse 28

01109 Dresden

ZMD America, Inc.

8413 Excelsior Drive

Suite 200

Zentrum Mikroelektronik

Dresden AG, Japan Office

2nd Floor, Shinbashi Tokyu Bldg.

4-21-3, Shinbashi, Minato-ku

Tokyo, 105-0004

Madison, WI 53717

Germany

USA

Japan

Phone +49 (0)351.8822.7.772

Phone +01 (608) 829-1987

+01 (631) 549-2882

Phone +81.3.6895.7410

Phone +886.2.2377.8189

Fax

+49(0)351.8822.87.772 Fax

Fax

+81.3.6895.7301

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, indirect, 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. ZMD 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, warranty, tort (including negligence), strict liability, or otherwise.

The information furnished in this publication is subject to changes without notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

Contents

1

Electrical Characteristics...............................................................................................................................6

1.1. Absolute Maximum Ratings....................................................................................................................6

1.2. Operating Conditions..............................................................................................................................6

1.3. Electrical Parameters .............................................................................................................................7

1.3.1. Supply Current and System Operation Conditions..........................................................................7

1.3.2. Analog Front-End (AFE) Characteristics .........................................................................................7

1.3.3. Temperature Measurement (refer chapter 2.4) ...............................................................................7

1.3.4. AD-Conversion.................................................................................................................................7

1.3.5. Sensor Connection Check ...............................................................................................................8

1.3.6. DAC & Analog Output (Pin AOUT) .................................................................................................8

1.3.7. System Response............................................................................................................................8

1.4. Interface Characteristics & EEPROM.....................................................................................................9

1.4.1. I²C^TMInterface (refer 'ZSC31150 Functional Description' for timing details) ...................................9

1.4.2. ZACwire™ One Wire Interface (OWI)..............................................................................................9

1.4.3. EEPROM..........................................................................................................................................9

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 Amplifier (PGA).............................................................................................11

2.3.2. Offset Compensation .....................................................................................................................12

2.3.3. Measurement Cycle.......................................................................................................................12

2.3.4. Analog-to-Digital Converter............................................................................................................13

2.4. Temperature Measurement..................................................................................................................14

2.5. System Control and Conditioning Calculation......................................................................................15

2.5.1. Operation Modes............................................................................................................................15

2.5.2. Start Up Phase...............................................................................................................................15

2.5.3. Conditioning Calculation ................................................................................................................15

2.6. Analog Output AOUT............................................................................................................................16

2.7. Serial Digital Interface ..........................................................................................................................16

2.8. Failsafe Features, Watchdog and Error Detection...............................................................................16

2.9. High Voltage, Reverse Polarity and Short Circuit Protection ...............................................................17

Application Circuit Examples.......................................................................................................................18

Pin Configuration, Latch-Up and ESD Protection .......................................................................................20

4.1. Pin Configuration and Latch-up Conditions..........................................................................................20

4.2. ESD-Protection.....................................................................................................................................20

Package.......................................................................................................................................................21

Quality and Reliability..................................................................................................................................21

Customization..............................................................................................................................................21

Ordering Information ...................................................................................................................................22

Additional Documents .................................................................................................................................22

2

3

4

5

6

7

8

9

10 Glossary ......................................................................................................................................................23

11 Document Revision History.........................................................................................................................24

Data Sheet

4 of 24

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

August 16, 2011

notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

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

Table 1.2

Table 2.1

Table 2.2

Absolute Maximum Ratings.............................................................................................................6

Operating Conditions.......................................................................................................................6

Adjustable Gains, Resulting Sensor Signal Spans and Common Mode Ranges .........................11

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: Pin Configuration and Latch-Up Conditions ..................................................................................20

Data Sheet

5 of 24

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

August 16, 2011

notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

1

Electrical Characteristics

1.1. Absolute Maximum Ratings

Parameters apply in operation temperature range and without time limitations.

Table 1.1

No.

Absolute Maximum Ratings

Parameter

Symbol

Conditions

Min

Max

Unit

1.1.1

Supply Voltage ¹

VDDE_AMRTo VSSE, refer to chapter

3 for application circuits

-33

33

VDC

1.1.2

1.1.3

Potential at pin AOUT ¹

V_OUT

VDDA_AMRRelated to VSSA,

VDDE - VDDA < 0.35 V

Related to VSSA

Related to VSSE

-33

33

VDC

1

Analog Supply Voltage

-0.3

6.5

1.1.4

1.1.5

Voltage at all analog and

digital IO – Pins

V_{A_IO}

V_{D_IO}

-0.3

-55

VDDA + 0.3

150

VDC

Storage temperature

T_STG

C

1.2. Operating Conditions

All voltages are related to VSSA.

Table 1.2

No.

Operating Conditions

Parameter

Symbol

T_AMB

Conditions

TQE

Min

Typ

Max

150

125

Unit

C

2

1.2.1

Ambient temperature

-40

1.2.2.1

Ambient temperature

T_{AMB_TQA}

TQA

C

advanced performance ⁴

1.2.2.2

Ambient temperature

T_{AMB_TQI}

TQI

-25

85

C

advanced performance ⁴

1.2.3

1.2.4

1.2.5

Supply Voltage

VDDE

R_{BR_V}

R_{BR_C}

4.5

2

5.0

5.5

25

10

VDC

k

3, 4

Bridge Resistance

Bridge Voltage Mode

Bridge Resistance ^{3, 4}

Bridge Current Excitation,

note I_{BR_MAX}

k

4

1.2.6

Resistor R_IBR

R_IBR

I_BR= VDDA / (16 * R_IBR

)

0.07 *

R_BR

k

1.2.7

1.2.8

Maximum Bridge Current

I_{BR_MAX}

2

mA

Maximum Bridge Top

Voltage

V_{BR_TOP}

(¹⁵/₁₆* VDDA) - 0.3

V

1.2.9

TC Current Reference

TC R_IBR

Behavior influences

generated current

50 ppm/K

4

Resistor

1

Refer to the 'ZSC31150 High Voltage Protection Description' for specification and detailed conditions

2

3

Notice temperature profile description in the 'ZSC31150 Dice Package Document' for operation in temperature range > 125 °C

Symmetric behavior and identical electrical properties (especially with regard to the low pass characteristic) of both sensor inputs of

the ZSC31150 are required. Unsymmetrical conditions of the sensor and/or external components 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.

Data Sheet

6 of 24

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

August 16, 2011

notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

1.3. Electrical Parameters

All parameter values are valid on behalf on in chapter 1.2 specified operating conditions (special definitions

excluded). All Voltages related to VSSA.

No.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

1.3.1. Supply Current and System Operation Conditions

1.3.1.1

1.3.1.2

Supply current

T_ADV

Without bridge and load

current, f_CLK 3 MHz

5.5

4 ¹

mA

Clock frequency

T_{AMB_TQA}

Guaranteed adjustment

range

2 ¹

3

MHz

1.3.2. Analog Front-End (AFE) Characteristics

1.3.2.1

1.3.2.2

Input Span

V_{IN_SP}

Analog gain: 420 to 2.8

1

275

300

mV/V

Analog Offset

Compensation Range

Depends on gain adjust,

refer to chapter 2.3.2

-300

% V_{IN_SP}

1.3.2.3

1.3.2.4

Parasitic differential input

offset current ¹

I_{IN_OFF}

V_{IN_CM}

Within T_AMB;

Within T_{AMB_TQI}

-10

-2

10

2

nA

Common mode input

range

Depends on gain adjust,

no XZC, refer to chapter

2.3.1

0.29 *

VDDA

0.65 *

VDDA

V

1.3.3. Temperature Measurement (refer chapter 2.4)

1.3.3.1

1.3.3.2

1.3.3.3

1.3.3.4

1.3.3.5

External temperature

diode channel gain

A_TSED

300

1300

20

ppm FS

/ (mV/V)

External temperature

diode bias current

I_TSE

6

10

A

External temperature

diode input range ¹

0

1.5

V

External temperature

resistor channel gain

A_TSER

V_TSER

1200

0

3500

600

ppm FS

/ (mV/V)

External temperature

resistor / input voltage

mV/V

1

range

1.3.3.6 Internal temperature diode

sensitivity

ST_TSI

raw values – without

conditioning

700

13

2700

ppm FS

/ K

1.3.4. AD-Conversion

1.3.4.1

1.3.4.2

1.3.4.3

1.3.4.4

1.3.4.5

A/D Resolution ¹

DNL ¹

r_ADC

16

0.95

4

Bit

LSB

DNL_ADC

INL_ADC

Range

r_ADC=13Bit, f_CLK=3MHz,

best fit, 2nd order,

complete AFE, 1.3.4.5

INL TQA ¹

LSB

INL TQE

5

LSB

ADC Input Range

10

90

%VDDA

1

No measurement in mass production, parameter is guaranteed by design and/or quality observation.

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

notice.

Data Sheet

August 16, 2011

7 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

No.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

1.3.5. Sensor Connection Check

1.3.5.1

1.3.5.2

Sensor connection loss

Sensor input short

R_{SCC_min}

R_{SSC_short}

detection threshold

100

0

k

short detection

guaranteed

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

1.3.6.2

D/A Resolution

r_DAC

analog output, 10-90%

12

Bit

Output current sink and

source for VDDE=5V

I_{SRC/SINK_OUT}

V_OUT: 5-95%,

R_LOAD>=2kΩ

2.5

5

mA

V_OUT: 10-90%,

R_LOAD>=1kΩ

1.3.6.3

Short circuit current

I_{OUT_max}

to VSSE/VDDE ¹

-25

25

mA

1.3.6.4 Addressable output signal

range

V_{SR_OUT95}

V_{SR_OUT90}

0.05

0.1

0.95

0.9

VDDE

@ R_LOAD>=2k

@ R_LOAD>=1k

2

1.3.6.5

1.3.6.6

Output slew rate

SR_OUT

C_LOAD< 50nF

0.1

V/µs

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

1.3.6.8

1.3.6.9

1.3.6.10

Load capacitance ²

DNL

C_LOAD

DNL_OUT

INL_OUT

I_{LEAK_OUT}

C3 + CL (refer chapter 3)

150

1.5

5

nF

-1.5

-5

LSB

µA

INL TQA ²

best fit, r_DAC=12Bit

INL TQE

-8

8

1.3.6.11 Output Leakage current @

150grd

in case of power or

ground loss

-25

25

1.3.7. System Response

3

1.3.7.1

Startup time

t_STA

to 1st output, f_CLK=3MHz,

no ROM check, ADC:

14bit & 2nd order

5

ms

1.3.7.2

1.3.7.3

1.3.7.4

Response time

(100% jump) ²

t_RESP

f_CLK=4MHz, 13Bit, 2nd

order, refer Table 2.3

256

512

µs

Bandwidth ²

comparable to analog

SSCs

5

kHz

mV

Analog Output Noise

Peak-to-Peak ²

V_NOISE,PP

shorted inputs, gain=

10

3

bandwidth  10kHz

1.3.7.5

Analog Output Noise

RMS ²

V_NOISE,RMS

shorted inputs, gain=

mV

bandwidth  10kHz

1

2

3

minimum output voltage to VDDE or maximum output voltage to VSSE

No measurement in mass production, parameter is guaranteed by design and/or quality observation.

Depends on resolution and configuration - start routine begins approximately 0.8ms after power on

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

notice.

Data Sheet

August 16, 2011

8 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

No.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

1.3.7.6

Ratiometricity Error

RE_{OUT_5}

maximum error of

1000

ppm

VDDE=5V to 4.5/5.5V

1.3.7.7

Overall failure (deviation

from ideal line including

INL, gain, offset & temp

errors)

F_ALLTQI

13Bit 2^ndorder ADC,

0.25 (0.1)

0.5 (0.25)

1.0 (0.5)

% FS

F

_ALLTQA

f

_CLK<=3MHz,

F_ALLTQE

XZC=0¹,

no sensor caused effects;

inside of parenthesis:

digital readout

1.4. Interface Characteristics & EEPROM

No.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

1.4.1. I²C^TMInterface (refer 'ZSC31150 Functional Description' for timing details)

1.4.1.1

1.4.1.2

1.4.1.3

1.4.1.4

1.4.1.5

1.4.1.6

Input-High-Level ²

Input-Low-Level ²

V_{I²C_IN_H}

V_{I²C_IN_L}

V_{I²C_OUT_L}

C_SDA

0.8

VDDA

pF

0.2

0.15

400

100

Output-Low-Level ²

Open Drain, I_OL<2mA

SDA load capacitance ²

SCL clock frequency ²

Internal pull-up resistor ²

f_SCL

kHz

R_I²C

25

k

1.4.2. ZACwire™ One Wire Interface (OWI)

1.4.2.1

1.4.2.2

1.4.2.3

1.4.2.4

Input-Low-Level ²

Input-High-Level ²

Output-Low-Level ²

Start Window ²

V_{OWI_IN_L}

V_{OWI_IN_H}

0.2

VDDA

ms

0.75

96

V_{OWI_OUT_L}

Open Drain, I_OL<2mA

typ: @ f_CLK=3MHz

t.b.d.

455

175

1.4.3. EEPROM

1.4.3.1

1.4.3.2

Ambient temperature

T_{AMB_EEP}

n_{WRI_EEP}

-40

150

C

EEPROM programming ²

Write cycles ²

@write <= 85°C

@write up to 150°C

100k

100

2

3

1.4.3.3

1.4.3.4

Read cycles

n_{READ_EEP}

t_{RET_EEP}

<=175°C

8 * 10⁸

Data retention ²

1300h @ 175°C

15

a

4

(=100000h@55°C &

27000h@125°C &

3000h@150°C)

1.4.3.5

Programming time ²

t_{WRI_EEP}

per written word,

12

ms

f

_CLK=3MHz

1

2

3

4

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 guaranteed by design and/or quality observation.

valid for the dice, notice additional package and temperature version caused restrictions

over lifetime and valid for the dice, use calculation sheet 'ZMDI Temperature Profile Calculation Sheet' for temperature stress

calculation, notice additional package and temperature version caused restrictions

Data Sheet

9 of 24

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

August 16, 2011

notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

2

Circuit Description

2.1. Signal Flow

The ZSC31150’s signal path is partly analog and partly digital. The analog part is realized differentially – this

means, the differential bridge sensor signal is internally 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

ZACwire^TM

I²C

RAM

EEPROM

Digital

Data I/O

Analog

Out

PGA

TS

ADC

CMC

DAC

BAMP

ROM

Analog Block

Digital Block

ZSC31150

PGA

Programmable Gain Amplifier

Multiplexer

MUX

ADC

Analog-to-Digital Converter

Calibration Microcontroller

Digital-to-Analog Converter

CMC

DAC

BAMP

EEPROM

TS

Buffer Amplifier – output buffer OPAMP

Non Volatile Memory for Calibration Parameters and Configuration

On-chip Temperature Sensor (pn-junction)

ROM

RAM

Memory for Correction Formula and –Algorithm

Volatile Memory for Calibration Parameters and Configuration

The differential signal from the bridge sensor is pre-amplified by the Programmable Gain Amplifier (PGA). The

Multiplexer (MUX) transmits the signals from either the bridge sensor, the external diode, or the separate

temperature sensor, to the Analog-to-Digital Converter (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 sensor-specific coefficients stored in the EEPROM during calibration.

Dependent on the programmed output configuration, the corrected sensor signal is output as an analog value

or in a digital format (I²C^TMor ZACwire^TM). The configuration data and the correction parameters can be

programmed into the EEPROM via the digital interfaces.

Data Sheet

10 of 24

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without

August 16, 2011

notice.

ZSC31150

Fast Automotive Sensor Signal Conditioner

2.2. 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 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 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 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 Programmable Gain Amplifier (PGA), the 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

No.

Overall Gain

a_IN

Max. Span

V_{IN_SP}

[mV/V]

Gain

Amp1

Gain

Amp2

Gain

Amp3

Input common mode range

V_{IN_CM}as % of VDDA ¹⁴

13

XZC = Off

29 to 65

32 to 57

XZC = On

45 to 55

not applicable

1

2

420

280

210

140

105

70

1.8

2.7

30

15

7.5

3.75

1

7

4.66

7

2

3

3.6

4

5.4

4.66

7

5

7.1

6

10.7

14.3

21.4

28.5

53.75

80

4.66

7

52.5

35

8

4.66

3.5

7

9

26.3

14

10

11

12

13

9.3

7

1

4.66

3.5

1.4

107

267

1

2.8

1

13

Recommended internal signal range is 75% of supply voltage in maximum.

Span is calculated by the following formula: Span = 75% / gain

Bridge in voltage mode, containing maximum input signal (with XZC: +300% Offset), 14-bit accuracy. Refer to the 'ZSC31150

Functional Description' for usable input signal/common mode range at bridge in current mode.

14

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notice.

Data Sheet

August 16, 2011

11 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

2.3.2.

Offset Compensation

The ZSC31150 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 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 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.

Table 2.2

PGA gain

a_IN

Analog Zero Point Shift Ranges (XZC)

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

280

210

140

105

70

1.8

2.7

12.5 %

7.6 %

12.5 %

7.6 %

12,5 %

7.6 %

7.8

7.1

15.5

14.2

31

388 %

237 %

388 %

237 %

388 %

237 %

388 %

237 %

161 %

388 %

237 %

161 %

26 %

3.6

5.4

7.1

10.7

14.3

21.4

28.5

53.75

80

28

52.5

35

12,5 %

7.6 %

32

57

26.3

14

5.2 %

52

12.5 %

7.6 %

194

189

161

72

9.3

7

107

267

5.2 %

2.8

0.83 %

2.3.3.

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 (V_OFF

)

Pre-amplified bridge sensor signal

The complete measurement cycle is controlled by the CMC. The cycle diagram at Figure 2.2 shows its

principle 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 independent from EEPROM

configuration always in every cycle.

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Data Sheet

August 16, 2011

12 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

Figure 2.2: Measurement Cycle

Start routine

1

Temperature Auto Zero

Pressure measurement

Temp measurement

Pressure measurement

Pressure auto zero

Pressure measurement

CMV

n

1

n

1

n

1

n

1

n

1

n



Pressure measurement

SSC/SCC+

Pressure measurement

SSC/SCC-

Pressure measurement

2.3.4.

Analog-to-Digital Converter

The ADC is an integrating AD-Converter in full 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 term instability of the clock frequency. The conversion cycle time depends

on the desired resolution and can be roughly calculated by:

t_{CYC_1}= 2^r/ 2 / f_CLK

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:

t_{CYC_2}= 2^(r+3)/2/ 2 / f_CLK

The calculation formulas give an overview about conversion time for one AD-conversion. Refer Calculation

sheet 'ZSC31150 Bandwidth Calculation Sheet' for detailed calculation of sampling time and bandwidth.

The result 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

r:

:

number of counts (result of the conversion)

adjusted resolution in bit

V_{ADC/REF_DIFF}

RS_ADC

:

differential input/reference voltage of ADC

digital ADC Range Shift (RS_ADC= ¹/₁₆, ¹/₈, ¹/₄, ¹/₂, controlled by the EEPROM content)

:

With the RS_ADCvalue a sensor input signal can be shifted in the optimal input range of the ADC.

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Data Sheet

August 16, 2011

13 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

Table 2.3:

Analog Output Resolution Versus Sample Rate

ADC

Adjustment

Approximated Output

Resolution ¹⁵

Sample Rate

Averaged

Bandwidth @

16

f_CON

Order

O_ADC

r_ADC

[Bit]

13

Digital

[Bit]

13

Analog

[Bit]

12

f_CLK=3MHz

f_CLK=4MHz

[Hz]

f_CLK=3MHz

f_CLK=4MHz

[Hz]

172

[Hz]

345

[Hz]

130

67

460

14

12

178

237

89

1

15

14

12

90

120

34

45

16

14

12

45

61

17

23

13

12

5859

3906

2930

1953

7813

5208

3906

2604

2203

1469

1101

734

2937

1958

1468

979

14

12

2

15

14

12

16

14

12

Remark: ADCs reference voltage ADC_VREFis defined by the potential between <VBR_T> and <VBR_B> (or

<VDDA> to <VSSA>, 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 used in maximum from 10% to 90% of ADC_{RANGE_INP}- a necessary

condition for abiding specified accuracy, stability and nonlinearity 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 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 (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

adjustment.

15

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.

The sampling rate (AD conversion time) is only a part of the whole cycle, refer “ZSC31150 bandwidth calculation sheet” for detailed

16

information

Data Sheet

14 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

2.5. 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 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 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

2.5.2.

Start Up Phase¹⁷

The start up phase consists 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 'ZSC31150 High Voltage Protection Description',

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 (~9000µs with ROM-check – 28180clocks ), 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 (refer 2.6):

- OWIANA & OWIDIS => AOUT: LOW (DM)

- OWIWIN & OWIENA => AOUT: tristate

The analog output AOUT will be activated at the end of start up phase depending on adjusted output and

communication mode (refer chapter 2.6). 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

'ZSC31150 Bandwidth Calculation Sheet' for detailed information about output update rate.

2.5.3.

Conditioning Calculation

The digitalized 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 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

'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 straight 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 correlates with internal clock frequency. Timings estimated for fclk=3MHz.

Data Sheet

15 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

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.

2.6. Analog Output AOUT

The analog output is used for output the analog signal conditioning result and for “End of Line” communication

via the ZACwire^TMinterface (one wire communication interface - OWI). The ZSC31150 supports four different

modes of the analog output in combination with OWI behavior:



OWIENA:

OWIDIS:

OWIWIN:

analog output is deactivated, OWI communication is enabled

analog output is active (~2ms after power on), OWI communication is disabled

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

analog output will be activated after ~2ms power on time,



OWIANA:

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 a unity gain output buffer, those input signal is generated by a 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 ZSC31150.

2.7. Serial Digital Interface

The ZSC31150 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 communication

protocols – I²C^TMand 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 'ZSC31150 Functional Description' for a detailed description of the serial interfaces and communication

protocols.

2.8. Failsafe Features, Watchdog and Error Detection

The ZSC31150 detects various possible errors. A detected error is signalized by changing the internal 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 'ZSC31150 Functional Description' for a detailed description of safety features and

methods of error messaging.

Data Sheet

16 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

2.9. High Voltage, Reverse Polarity and Short Circuit Protection

The ZSC31150 is designed for 5V power supply operation.

The 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 under all potential conditions at the pins VDDE and VSSE.

All external components – explained in application circuit in chapter 3 – are required to guarantee this

operation. The protection is no time limited. Refer 'ZSC31150 High Voltage Protection Description' for a

detailed description of protection cases and conditions.

Data Sheet

17 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

3

Application Circuit Examples

The application circuits contain external components, which are needed for overvoltage, reverse polarity, and

short circuit protection.

Note:

Table 3.1:

Symbol

C1

Check also the available 'ZSC31150 Application Notes' for application examples and board layout.

Application Circuit Parameters

Parameter

Min

100

4

Typ

Max

Unit

nF

Notes

C

470

C2

nF

18, 2

C3

47

160

10

nF

The value of C3 is the sum of the load

capacitor and the cable capacitance

19

C4, C5

C

0

nF

Recommended to increase EMC immunity.

The value of C4, C5 is the sum of the load

capacitor and the cable capacitance

R1

10

kꢀ

R_IBR

R

Refer to chapter 1.2

ꢀ

Figure 3.1: Bridge in Voltage Mode, External Diode Temperature Sensor

18

value of C3 summarizes load capacitor and cable capacity

higher values for C3, C4 and C5 increase EMC immunity

19

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Data Sheet

August 16, 2011

18 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

Figure 3.2: Bridge in Voltage Mode, External Thermistor

Figure 3.3: Bridge in Current Mode, Temperature Measurement via Bridge TC

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Data Sheet

August 16, 2011

19 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

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

Name

VDDA

VSSA

SDA

Description

Remarks

Usage/

Latch-up Related Application

Connection ²⁰Circuit Restrictions and/or Remarks

1

2

Positive analogue supply

voltage

Analog IO Required/-

Negative analogue supply

voltage

3

I²C^TMdata IO

Digital IO, -/VDDA

pull-up

Trigger Current/Voltage to

VDDA/VSSA:

+/-100mA or 8/-4V

4

SCL

I²C^TMclock

Digital IN, -/VDDA

pull-up

6

VDD

Positive digital supply

voltage

Analog IO Required or

open/-

only capacitor to VSSA is allowed,

otherwise no application access

7

VDDE

VSSE

AOUT

VBN

Positive external supply

voltage

Supply

Ground

IO

Required/-

Trigger Current/Voltage: -100mA/33V

8

Negative external supply

voltage

9

Analog output & one wire

IF IO

10

Negative input sensor

bridge

Analog IN Required/-

11

13

12

14

VBR_B

VBR_T

VBP

Bridge bottom potential

Bridge top potential

Analog IO Required/VSSA

Analog IO Required/VDDA

Depending on application circuit,

short to VDDA/VSSA possible

Positive input sensor bridge Analog IN Required/-

IRTEMP Temp sensor & current

source resistor

Analog IO -/VDDA, VSSA

Depending 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 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.

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

Data Sheet

20 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

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=55°C, S=60%) is guaranteed. A typical fit 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.

Thus ZMDI can provide a custom solution quickly. Please contact ZMDI for further information.

Data Sheet

21 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

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

Modular Mass Calibration System (MSC) for

MCS boards, cable, connectors,

Calibration System V1.1 ZSC31150

DVD with software and documentation

9

Additional Documents

Document

File Name

ZSC31150 Feature Sheet

ZSC31150_FeatureSheet_Rev_*.PDF

ZSC31150_FunctionalDescription_Rev_*.PDF

ZSC31150_HV_PROT_Rev_*.PDF

ZSC31150_DicePackagePin_Rev_*.PDF

ZSC31150_Bandwidth_Calculation_Rev*.xls

ZMDI_Temperature_Profile_Rev_*.xls

ZSC31150_APPLKIT_Rev_*.pdf

ZSC31150 Functional Description

ZSC31150 High Voltage Protection Description

ZSC31150 Dice Package

ZSC31150 Bandwidth Calculation Sheet

ZMDI Temperature Profile Calculation Sheet

ZSC31150 Application Kit Description

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.

Data Sheet

22 of 24

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ZSC31150

Fast Automotive Sensor Signal Conditioner

10 Glossary

Term

ADC

AEC

AFE

Description

Analog-to-Digital Converter

Automotive Electronics Council

Analog Front End

AOUT

BAMP

CM

Analog Output

Buffer Amplifier

Command Mode

CMC

CMV

CMOS

DAC

DM

Calibration Microcontroller

Common Mode Voltage

Complementary Metal Oxide Semiconductor

Digital-to-Analog Converter

Diagnostic Mode

EEPROM

ESD

LDR

MUX

NOM

OWI

P

Electrically Erasable Programmable Read Only Memory

Electrostatic Device

Lower Diagnostic Range

Multiplexer

Normal Operation Mode

One Wire Interface

Pressure

PGA

POC

RAM

RISC

ROM

SCC

SIF

Programmable Gain Amplifier

Power on Clear

Random-Access Memory

Reduced Instruction Set Computer

Read Only Memory

Sensor Connection Check

Serial Interface

SSC+

SSC-

TS

Positive-biased Sensor Short Check

Negative-biased Sensor Short Check

Temperature Sensor

XZC

eXtended Zero Compensation

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Data Sheet

August 16, 2011

23 of 24

ZSC31150

Fast Automotive Sensor Signal Conditioner

11 Document Revision History

Revision

0.46

Date

June 12, 2008

July 20, 2008

Description

First release after format update

Update after review

0.47

1.01

September 20, 2008 “6.” – fit rate added

”1.5.2” – ROM check time revised/corrected

”5.3.4.3” – SSC – no detection limit added

1.02

1.03

1.04

1.05

September 20, 2009 adjust to new ZMDI template

October 2, 2009

October 22, 2009

February 26, 2010

change to ZMDI denotation

formatting and linking issues solved

adjust to new ZMDI template

include 'ZSC31150 Feature Sheet' at page 2&3

add ordering codes for ZSC31150 and evaluation kits

extend glossary

add new phone number for ZMD FAR EAST, Ltd. and ZMDA America Office

Madison

1.06

July 29, 2010

correct “Offset shift per step” and “Approx. maximum offset shift” in Table 2.2 for

PGA gain = 105 and 52.5

move 1.4.1.6 “Internal pull-up resistor” into chapter 1.4.1 in Table 1.2

redrawing of Sensor Bridge in Figure 3.1, Figure 3.2 and Figure 3.3

add comment for C4 and C5 in Figure 3.3

rename ZMD31150 to ZSC31150

1.07

1.08

August 31, 2010

August 15, 2011

Connection of R_IBRin Figure 3.3 corrected

Update ordering information with “Long Life Automotive”

(refer Ordering Information and chapter 8)

Sales and Further Information

www.zmdi.com

SSC@zmdi.com

Zentrum Mikroelektronik

ZMD America, Inc.

8413 Excelsior Drive

Suite 200

Zentrum Mikroelektronik

Dresden AG, Japan Office

ZMD Far East, Ltd.

3F, No. 51, Sec. 2,

2nd Floor, Shinbashi Tokyu Bldg. Keelung Road

Dresden AG

Grenzstrasse 28

01109 Dresden

Germany

Madison, WI 53717

4-21-3, Shinbashi, Minato-ku

Tokyo, 105-0004

Japan

11052 Taipei

Taiwan

USA

Phone +49 (0)351.8822.7.772

Phone +01 (608) 829-1987

+01 (631) 549-2882

Phone +81.3.6895.7410

Phone +886.2.2377.8189

Fax

+49(0)351.8822.87.772 Fax

Fax

+81.3.6895.7301

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, indirect, 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. ZMD 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, warranty, tort (including negligence), strict liability, or otherwise.

Data Sheet

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型号：	ZSC31150FLB-R
厂家：	ETC
描述：	Fast Automotive Sensor Signal Conditioner
文件：	总25页 (文件大小：663K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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