ams TMD27721WA Digital Ambient Light Sensor



The TMD2772WA family of devices provides digital ambient light sensing (ALS), a complete proximity detection system, and digital interface logic in a single 8-pin surface mount module. The devices are register-set and pin-compatible with the TMD2771 family of devices and include new and improved ALS and proximity detection features and are available with 25° and 50° fields of view. The ALS enhancements include a reduced gain mode that extends the operating range in sunlight. Proximity detection includes improved signal-to-noise performance and more accurate factory calibration. A proximity offset register allows compensation for optical system crosstalk between the IR LED and the sensor. To prevent false proximity data measurement readings, a proximity saturation indicator bit signals that the internal analog circuitry has reached saturation.



  • Ambient light sensing, proximity detection, and IR LED in a single module
  • Wide variety of programmable features with very high sensitivity
  • Proximity detection
  • Maskable ALS and proximity interrupt
  • Power management
  • I²C fast mode compatible interface
  • 3.94mm x 2.36mm x 1.35mm package
  • Available with standard 25° (TMD2772) and wide 50° (TMD2772WA)


  • Minimizes board space requirements
  • Approximates human eye response over a wide variety of lighting conditions
  • Reduces external processor burden
  • Enables dynamic power dissipation control
  • Industry standard two-wire interface
  • Small foot print module
  • Optimizes ambient light sensing angle



Application note