ZMD31150
Fast Automotive Sensor Signal Conditioner
Datasheet
Features
•
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)
or ZACwire
TM
(digital one-wire-interface)
•
Temperature compensation: internal or
external diode, bridge resistance, thermistor
•
Sensor biasing by voltage or constant current
•
Sample rate up to 7.8kHz
•
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
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)
Brief Description
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 ZACwire
TM
and I
2
C 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.
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
PRELIMINARY
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.
ZMD [ Zentrum Mikroelektronik Dresden AG ]
