The low-power GMR (giant magneto resistive) readout ASIC is co-integrated with the GMR sensors on a single die and it is used for crankshaft and transmission speed and direction sensing. It contains a speed and a direction analog readout channel, a multiplexed SAR ADC and a digital processing unit, containing an adaptive algorithm for vibration and air gap variation tolerant sensing and direction detection and PWM communication with the car’s control unit.

FEATURES:

• GMR (Giant Magneto Resistive) sensor readout ASIC
• Wheatstone bridge signal conditioning
• Digital processing included
  • Air gap variation tolerant
  • Vibration tolerant sensing
  • Direction detection
  • Dynamic self calibration
• Low power (2.5V Vdd in 0.65um technology)
• Low jitter performance
• High sensitivity and large air gap capability
• Large frequency range (up to 15 kHz)
• Three-wire digital voltage interface (PWM)
• VHDL-AMS modelling of the sensor by ICsense
• Multiplexed 200 kS/s 12-bit SAR ADC
• AEC-Q100 qualified
• Temperature range -40°C to 200°C
• 0.65um BiCMOS technology
• Module style package with two integrated capacitors:
  • 4.7nF between Q and GND
  • 47nF between Vs and GND