Rain and Light Sensor Interface with SPI

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The NCV76124 is an interface chip for rain and light detection in automotive applications. It measures external photodiode currents that represent rain and light signals, and transfers the converted signals to a master microcontroller on request via the SPI interface. The rain measurement data can be used to control the rain wipers. The light intensity signals can be used for brightness control of displays, the headlamp control and others. The rain and light sensor chip from onsemi is the only ASSP on the market that was designed for functional safety, or ISO 26262. The device is capable of ASIL B and a full safety plan is available. With easy control via SPI (Serial Peripheral Interface) interface, our rain and light sensor requires minimum software overhead and provides more sensor channels with an extremely high dynamic range, creating a high performance and safe solution for modern vehicles. Thanks to the SPI programmability, one single hardware configuration can support various applications. Our device also supports both major sensor module architectures, making it compatible with all module designs.

  • Rain sensor for wipers
  • Ambient light sensor
  • Front lighting
  • Head-up display
  • HVAC control
  • Rain-sensitive wipers
  • Automated headlight
  • Periodic Measurement of 4 (optionally 5) Light Sensor Signals and of 2 (optionally 1) Rain Sensor Signals with Environmental Light Cancellation Circuitry
  • Programmable Gain Trans Impedance Amplifiers for signal measurement
  • Watchdog functionality and diagnostic circuitry compliant to ASIL-B
  • Configurable Rain Pulse Current Amplitude, Timing and Repetition Rate
  • Standby and Sleep Modes with Low Current Consumption
  • AEC−Q100 Qualified and PPAP Capable
  • Device Temperature Measurement

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NCV76124MW0R2G

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A

H

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QFNW-24

1

260

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2500

Y

Photodiode

3.3

Safety Design

SPI

$1.5866

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