Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19

1/19

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.

ZMD31020

Sensor Signal Conditioner

Datasheet

Features

•

Digital compensation of sensor offset, sensitivity,

temperature drift and non-linearity

•

Adjustable to nearly all piezo-resistive bridge

sensor types

•

Digital one-shot calibration: quick and precise

•

Selectable temperature compensation reference:

internal or external diode

•

Output options: 0...5V analog ratiometric voltage

or 12 bit digital I

•

Product traceability by user-defined EEPROM

entries

•

Operation temperature range, depending on

product version, up to –40...+125°C

•

Supply voltage +4.5...+5.5V

•

Sampling rate ≥100Hz

•

Available in SSOP14 or as die

Benefits

•

No external trimming components required

•

PC-controlled configuration and calibration via

digital bus interface - simple, low cost

•

High accuracy (±0.1% FSO @ -25 to 85°C;

±0.25% FSO @ -40 to 125°C)

Brief Description

ZMD31020 is a CMOS integrated circuit for highly-

accurate amplification and sensor-specific correction

of bridge sensor signals. The device provides digital

compensation

of

sensor

offset,

sensitivity,

temperature drift and non-linearity by a 16-bit RISC

micro controller running a correction algorithm.

ZMD31020 accommodates nearly all piezo-resistive

bridge sensor types.

The bi-directional digital I

a

simple

PC-controlled

one-shot

calibration

procedure, in order to program a set of calibration

coefficients into an on-chip EEPROM. Thus a specific

sensor and a ZMD31020 are mated digitally: fast,

precise and without the cost overhead associated with

trimming by external devices or laser.

ZMD31020 has been designed for industrial and

consumer applications and is specifically suited for

most pressure sensors.

§

Demo kit available (incl. calibration PCB,

SSOP14 samples, software, technical

documentation)

§

Support for industrial calibration available

§

Quick circuit customization possible for large

production volumes

Application Circuit Example