ZMD31150 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.
ZMD31150 accommodates virtually any resistive bridge sensor (e.g. piezo-resistive and steel membrane based pressure sensors). The bi-directional digital interfaces (I²C and 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.
ZMD31150 has been designed for automotive applications and is specifically suited for most pressure sensors. It can also be used with force, torque, acceleration, angle, position and revolution sensors. By its set of diagnosis functions also safety applications (e.g. at braking or steering systems) are supported without additional effort. The ZMD31150 is optimized for automotive environments by it's protection circuitry and excellent electromagnetic compatibility.

• Evaluation Kit (ZMD31150KIT) 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
• A set of diagnosis functions needed for safety applications
• Temperature compensation via internal diode, external diode or bridge sensor element
• Output options: voltage (0 to 5V), I²C, ZACwire™ (one-wire interface)
• Adjustable A to D resolution (13 to 16bits) versus sampling rate (up to 7.8kHz)
• High D to A resolution of 12 bit
• Selectable bridge excitation: ratiometric voltage or constant current
• Operation temperature range of (-40 to +125)°C or (-40 to +150)°C
• Supply voltage (4.5V to +5.5V) VDC
• Available in SSOP14 or as die

• 3^rd order non-linearity correction
• ZACwire™ (one-wire-interface)
• Diagnosis functions:
  Sensor connection check (broken wires & short circuits)
  Sensor aging detection
  Power and Ground Loss
  Continuous RAM/ROM/EEPROM check
  Internal watchdog
• On-chip automotive protection circuitry (at VDD & OUT & GND only):
  Reverse polarity protection
  Short circuit protection at OUT (integrated current limitation of max. 20 mA)
  Overvoltage protection of +/- 33 V

• No external trimming components required
• PC-controlled configuration and calibration via digital bus interface – simple, low cost
• (±0.25%FSO@(-25 to +85)°C; ±0.5%FSO@(-40 to +125)°C; ±1%FSO@(-40 to +150)°C)

• High sensor accuracy, also for low-cost transducers
• "End-of-manufacture" calibration possible
• "one-shot" calibration : quick and precise
• Prevents incorrect measurements caused by sensor wire breakage or shorts
• Prevents incorrect measurements caused by sensor aging
• Prevents undefined behavior of the output in case of power or ground loss
• Safety applications are supported by the integrated set of diagnosis functions
• Product traceability by user-defined EEPROM entries (2 x 16 bit)

• High pressure sensors (e.g. for common rail fuel injection or hydraulic systems)
• Pressure sensors for safety-critical systems (e.g. brake or steering systems)
• MAP sensors (intake manifold or charging air pressure)
• Atmospheric reference pressure sensors for charging air pressure and exhaust-gas recirculation
• Absolute oil pressure sensors for service displays
• Differential pressure sensors for fuel filter contamination
• Tire pressure sensors (in combination with wireless transmitters)
• Low-/overpressure sensors in fuel tanks Occupant classification
• (OC) pressure sensors etc.