ZMD31020
Differential Sensor Signal Conditioner
Description
ZMD31020 is a CMOS integrated circuit for the conditioning of ratiometric differential sensor signals. The device
provides digital compensation of sensor offset, sensor sensitivity, temperature drift and non-linearity through a
16-bit RISC-microcontroller running a correction algorithm.
A bidirectional I2C-interface allows for a simple PC-controlled calibration procedure, encompassing writing and
programming of a set of calibration coefficients into an on-chip EEPROM. Thus a specific sensor and a
ZMD31020 device are mated digitally: fast, precise and without cost overhead for trimming components.
The ZMD31020 has been designed for commercial, industrial and automotive applications and is specifically
suited for piezo-resistive pressure sensors.
Features
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0.25%FSO accurate digital concept, based on 16-bit RISC-碌Controller
Ratiometric differential input stage: min. span 20mV/V; 15.66x to 42x PGA; 12-bit A-to-D conversion
Temperature reference: off- or on-chip diode; 10-bit A-to-D Conversion
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2 order signal conditioning algorithm, based on 7 calibration constants
0 to 5V ratiometric analog output & I2C digital output (12-bit resolution)
Throughput: 100 results / s
PC-controlled electronic calibration 鈥?simple, low-cost
Operation: -40擄C to +125擄C; +4.5V to +5.5V
Deliverable in SSOP14 (5.2mm width) or as die
Demokit available: samples, documentation, calibration-HW / SW
Application Circuit
Feature Sheet, Rev. 1.0, April 9th, 2002
漏 ZMD AG
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