ams AS7331 Spectral UV Sensor


The AS7331 is a low-power, low noise integrated UV sensor. The three separated UVA, UVB and UVC channels convert optical radiation signals via UV optimized photodiodes to a digital result and realize a continuous or triggered measurement. The irradiance responsivity can be adjusted via Gain, conversion time and internal clock frequency to effect sensitivity, full scale range and LSB. The by the AS7331 detected amount of radiation in the set Gain and conversion time configuration will be provided as digital counts by the AS7331. The AS7331 offers a range of 12 Gain steps by a factor of two for each step. The conversion time is internally controlled over a wide range of 15 steps by a factor of two for each step. With the input pin (SYN), the conversion time can be externally controlled to adapt the measurement to the given environment and time base.
With its irradiance responsivity factor and conversion time, the AS7331 supports an overall huge dynamic range up to 3.43E+10 (resolution multiplied by gain range). It achieves an accuracy of up to 24-bit signal resolution (internal via I²C and shifter 16-bit), with an irradiance responsivity per count down to 2.38 nW/cm² at 64 ms integration time. Via an integrated divider, the 16-bit I²C output can be adjusted to the significant bits of interest.



  • Interference filter technology
  • 3 channel UVA/B/C sensing
  • High dynamic range, adjustable to the application conditions
  • Class leading sensitivity
  • Broad conversion range
  • Extended temperature range


  • No filter aging or drifts over lifetime and temperature
  • Separated UVA/B/C radiation detection incl. daylight (VIS+NIR) blocking
  • Sensor settings adjustable from low to bright radiation conditions
  • Fast or high accurate radiation and fluorescence detection possible
  • Usability in harsh environments


产品类别 描述 单号 可行
AS7331-AQFM Q65114A3064
AS7331-AQFT Q65114A3065