AS7341 11-Channel Spectral Sensor

By ams 108

AS7341 11-Channel Spectral Sensor

The ams AS7341 is an 11-channel spectrometer for spectral identification and color matching applications used in mobile devices. The spectral response is defined in the wavelengths from approximately 350 nm to 1000 nm. Six channels can be processed in parallel by independent ADCs while the other channels are accessible via a multiplexer. Eight optical channels cover the visible spectrum, one channel can be used to measure near-infrared light and one channel is a photodiode without filter ("clear").

The device also integrates a dedicated channel to detect 50 Hz or 60 Hz ambient light flicker. The flicker detection engine can also buffer data for calculating other flicker frequencies externally. The NIR channel in combination with the other VIS channel may provide information of surrounding ambient light conditions (light source detection). The device can also be synchronized to external signals via pin GPIO. AS7341 integrates filters into standard CMOS silicon via nano-optic deposited interference filter technology, and its package provides a built-in aperture to control the light entering the sensor array. Control and spectral data access are implemented through a serial I2C interface. The device is available in an ultra-low-profile package with dimensions of 3.1 mm x 2 mm x 1 mm.

  • 11-channel optical sensing front end (350 nm to 1000 nm), fov: ±35°
  • 8-channel visible plus 3 special channels
    • Clear channel
    • Ambient light flicker detection on chip (up to 1.5 kHz)
    • IR channel
  • Responsivity: 500 to 3500 counts/µW/cm²
  • Integration time: T11 ch (typ)=2*tint=2*50 m=100 ms
  • I2C interface with 400 kHz
  • GPIO for:
    • External InGaAs / Si photodiodes
    • External trigger to start spectral measurement
  • Power consumption (typ): 210 µA active, 0.7 µA sleep
  • Supply voltage: 1.8 V
  • Small system size with 3.1 mm x 2 mm x 1 mm (OLGA 8 package)
  • Light source detection and spectral reconstruction of ambient light
  • Flicker immune camera operation and image optimization [AWB (automatic white balancing)]
  • Post-processing optimization of camera images (CRI measurement)
  • Color matching and skin tone measurement
    • Enhanced AI: Search and shop by color (eCommerce boost)
  • Display management, printers

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