DESCRIPTION

ZMD31030 is a CMOS integrated circuit for highly-accurate amplification and sensor-specific correction of bridge sensor
and temperature sensor signals. Digital compensation of sensor offset, sensitivity, temperature drift and non-linearity is accomplished via a 16-bit RISC microcontroller running a correction algorithm with calibration coefficients stored in a non-volatile EEPROM.

The ZMD31030 is adjustable to nearly all piezo-resistive bridge sensors. Measured values are provided at the PWM output or at the LIN interface. The digital LIN bus 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 ZMD31030 are mated digitally: fast, precise and without the cost overhead associated with trimming by external devices or laser.

The ZMD31030 is optimized for automotive environments by it’s protection circuitry and excellent electromagnetic compatibility.

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
• Selectable separate input channel for an external temperature sensor
• Output options: PWM (bridge sensor signal) or LIN interface (bridge and temp. sensor signal)
• Digital sensor calibration via LIN interface
• Sampling rate typically 125Hz
• High voltage protection
• Reverse polarity and short circuit protection
• Operation temperature -40 to +125°C
• Supply voltage 8 to 18V

BENEFITS

• No external trimming components required
• PC-controlled configuration and calibration via digital LIN bus interface – simple, low cost
• High accuracy (±0.1% FSO @ -25 to 85°C; ±0.25% FSO @ -40 to 125°C)

DOWNLOAD

Download zmd31030.pdf