ZSC31150

Fast Automotive Sensor Signal Conditioner

© 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.07

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.

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

Brief Description

The ZSC31150 is a CMOS integrated circuit for

highly-accurate amplification and sensor-specific

correction of bridge sensor signals. Digital

compensation

of

sensor

offset,

sensitivity,

temperature

drift,

and

non-linearity

is

accomplished

via

an

internal

16-bit

RISC

microcontroller running a correction algorithm, with

calibration coefficients stored in an EEPROM.

The ZSC31150 is adjustable to nearly all bridge

sensor types. Measured values are provided at the

analog voltage output or at the digital ZACwire

TM

and I²C

used for a simple PC-controlled calibration

procedure, in order to program a set of calibration

coefficients into an on-chip EEPROM. Thus, a

specific sensor and a ZSC31150 are mated

digitally: fast, precise, and without the cost

overhead associated with trimming by external

devices or a laser.

Features



Digital compensation of sensor offset,

sensitivity, temperature drift, and non-linearity



Adjustable to nearly all bridge sensor types,

analog gain of 420, overall gain up to 2000



Output options: ratiometric analog voltage

output (5 - 95% in maximum, 12.4 bit

resolution) or ZACwire

interface)



Temperature compensation: internal or external

diode, bridge resistance, thermistor



Sensor biasing by voltage or constant current



Sample rate up to 7.8 kHz



High voltage protection up to 33 V



Supply current: max. 5.5mA



Reverse polarity and short circuit protection



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

Traceability by user-defined EEPROM entries



Several safety and diagnostic functions



Benefits



No external trimming components required



Only a few external protection devices needed



PC-controlled configuration and One-Shot

calibration via I²C

Simple, cost efficient, quick, and precise



End-of-Line calibration via I²C

interface



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

0.5% FSO @ -40 to 125°C)



The ZSC31150 is optimized for automotive

environments by its special protection circuitry

and excellent electromagnetic compatibility

Available Support



Evaluation Kits



Application Notes



Mass calibration setup

Physical Characteristics



Supply voltage 4.5 to 5.5 V



Operation temperature: -40°C to 125°C

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

product version)

Available in SSOP



14 or as die

ZSC31150 Application Circuit

GND

OUT

VCC

Sensor

Module

ZSC

31150