ZMD31010
RBic
Lite
™ Low-Cost Sensor Signal Conditioner
Brief Description
The RBic
Lite
™ ZMD31010 is a sensor signal condi-
tioner integrated circuit, which enables easy and pre-
cise calibration of resistive bridge sensors via
EEPROM. When mated to a resistive bridge sensor,
it will digitally correct offset and gain with the option
to correct offset and gain coefficients and linearity
over temperature. A second-order compensation can
be enabled for temperature coefficients of gain or
offset or bridge linearity. The RBic
Lite
™ communi-
cates via ZMD’s ZACwire™ serial interface to the
host computer and is easily mass calibrated in a
Windows® environment. Once calibrated, the output
pin Sig™ can provide selectable 0 to 1 V, rail-to-rail
ratiometric analog output, or digital serial output of
bridge data with optional temperature data.
Benefits
•
•
•
•
•
•
No external trimming components required
PC-controlled configuration and calibration via
One-Wire Interface – simple, low cost
High accuracy (±0.1% FSO @ -25 to 85°C;
±0.25% FSO @ -50 to 150°C)
Single pass calibration – quick and precise
Suitable for battery-powered applications
Small SOP8 package
Available Support
•
Features
•
Digital compensation of sensor offset, sensitivity,
temperature drift, and non-linearity
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•
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Development Kit available
Multi-Unit Calibrator Kit available
Support for industrial mass calibration available
Quick circuit customization possible for large
production volumes
Physical Characteristics
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Supply voltage 2.7 to 5.5 V, with external JFET
5.5V to 30 V
Current consumption depending on adjusted
sample rate: 0.25 mA to 1 mA
Wide operational temperature: –50 to +150°C
•
Accommodates differential sensor signal spans,
from 1.2 mV/V to 60 mV/V
•
ZACwire™ One-Wire Interface (OWI)
•
Internal temperature compensation and detection
via bandgap PTAT (proportional to absolute
temperature)
•
Optional sequential output of both, temperature
absolute analog voltage, digital One-Wire
Interface (OWI)
and bridge readings, on ZACwire™ digital output
ZMD31010 Application Circuit – Digital Output
V
supply
•
Output options: rail-to-rail analog output voltage,
VDD
Bsink
Sig
TM
VBP
+4.5 to +5.5 V
•
Fast response time, 1 ms (typical)
•
High voltage protection up to 30 V with
external JFET
OUT/OWI
ZMD31010
Vgate
•
Chopper-stabilized true differential ADC
•
Buffered and chopper-stabilized output DAC
VBN
VSS
0.1 F
Ground
© 2009 ZMD AG — Rev. 2.00
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.
ZMD [ Zentrum Mikroelektronik Dresden AG ]
