Time-of-Flight level measurement ASIC for automotive

Time-of-Flight level measurement ASIC for automotive

High-voltage automotive qualified ASIC for the detection of fluid levels in a car (oil level, fuel level, …). The readout is based on US (UltraSound) transducers combined with a time-of-flight detection principle. The transducer elements require high-voltage drivers that are monolithically integrated on the ASIC.


  • Level/concentration measurement of fluids based on Ultrasound (US):
    • High-voltage (20V) Driver circuitry for single US transducer element
    • Analog input with amplifiers
    • ADC (Analog-to-Digital Converter)
    • Auxiliary blocks
    • Signal processing blocks (Time-of-Flight US + temperature)
    • SPI, PWM, OWI, SENT interface
  • UltraSound read-out chain with measurement accuracy of 150ns
    • Input voltage range ±0.05 up to ±500mV @2MHz (+ echo detection)
    • 12-bit 5-stage pipelined ADC topology
  • NTC (Negative Temperature Coefficient) thermistor read-out
    • Programmable input multiplexer
    • 15-bit delta-sigma ADC
  • Over-voltage, over-temperature, ESD and short-circuit protection

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