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
•
•
•
•
•
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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
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Digital compensation of sensor offset, sensitivity,
temperature drift, and non-linearity
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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
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The information furnished in this publication is subject to changes without notice.