ams TSL2521 - Ambient Light Sensor with Flicker Detection



The TSL2521 features ambient light sensing, as well as flicker detection. The device comes in a low-profile and small footprint, L2.0mm x W1.0mm x H0.5mm optical QFN package. The Ambient Light Sensing function provides two concurrent ambient light sensing channels, which can be arbitrarily connected to the photodiodes via a programmable multiplexer. TSL2521 incorporates a set of Infrared photodiodes and a set of clear photodiodes. The clear photodiode area is covered with a UV/IR blocking filter. This architecture accurately measures ambient light and enables the calculation of irradiance of different light sources. Calculation results help to improve display appearance and picture taking. The device also integrates direct detection of ambient light flicker. Flicker detection is executed in parallel with ambient light sensing and has independent gain configuration. The flicker detection engine will sample and buffer data for calculating flicker frequencies externally on a host CPU.



  • 1mlux detectable illuminance
  • UV/IR blocking filter for clear channel
  • ALS interrupt with thresholds
  • Flicker-immune ALS sensing with programmable integration time
  • Cuncurrent flicker and ALS measurement with new simplified readout methodology
  • Up to 7kHz flicker detection (14kHz sampling)
  • Configurable sleep mode
  • Interrupt-driven device
  • Digital and analog saturation flags


  • Invisible ALS sensing under any glass type
  • Unique fast ALS integration mode
  • Integrated ambient light flicker detection on chip
  • Low power consumption and minimum I²C traffic
  • Integrated status checking for all functions


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