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