ZMD31050 is a CMOS integrated circuit for amplification and sensor-specific correction of bridge sensor signals. The device provides digital compensation of sensor offset, sensitivity, temperature drift and non-linearity by a 16-bit RISC micro-controller running a correction algorithm. ZMD31050 accommodates virtually any resistive bridge sensor (e.g. piezo-resistive and steel membrane based pressure sensors). In addition, the device can interface to a separate temperature sensor. The bi-directional digital interfaces ( I²C , SPI, ZACwire™) can be used for a simple PC-controlled calibration procedure, encompassing writing and programming a set of calibration coefficients into an on-chip EEPROM. ZMD31050 has been designed for industrial, medical and consumer applications and is specifically suited for most pressure sensors. It can also be used with force, torque, acceleration, angle, position and revolution sensors.

• Evaluation Kit (ZMD31050KIT) available
• Support for mass calibration available
• Quick circuit customization possible for large production volumes

• Digital compensation of sensor offset, sensitivity, temperature drift and non-linearity
• Accommodates nearly all bridge sensors by PGA and programmable ADC
• Capable of conditioning bridge sensor signals ranging from 1 to 275mV/V
• Sensor connections check and aging detection
• Temperature compensation via internal diode, external diode or bridge sensor element
• Output options: voltage (0 to 5V), current (4 to 20mA), PWM, I²C , SPI, ZACwire™
  (one-wire interface), alarm
• Adjustable A to D resolution (up to 15bits) versus sampling rate (up to 3.9kHz)
• Selectable bridge excitation: ratiometric voltage, constant voltage or constant current
• Input channel for separate temperature sensor
• Operation temperature range, depending on product version, up to -40...+150°C
• Supply voltage +2.7V to +5.5V
• Available in SSOP16 or as die

• 3^rd order non-linearity correction
• Input channel for separate temperature sensor
• ZACwire™ (one-wire-interface)
• Sensor connection check
• Sensor aging detection

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

• Highest sensor accuracy, also for low-cost transducers
• Separate temperature measurement possible
• "End-of-manufacture” calibration possible
• Prevents incorrect measurements caused by sensor wire breakage
• Prevents incorrect measurements caused by sensor aging