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TMD27721WA Digital Ambient Light Sensor

Digital ambient light sensor, proximity sensor and IR LED in an optical module Vdd I2C


  • 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

Product parameters

Supply Voltage [V] 2.2 – 3.6
Programmable Gain, integration time, interrupt
Integrated Capabilities ALS, Prox, LED Drvr. IR LED
Recommended Operating Distances [cm] <15
Temperature Range [°C] -40 to 85
Package Surface-mount module, pin count 8

General description

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.


Title Category Headline Buy
TMD2772WAEvalKit Application Board Evaluation Kit for TMD2772WA

Technical documents

Type Description Language
Datasheet Document version 1-21 English
Application Note I2C Timing Requirements English
Application Note Proximity Detection and Link Budget (DN38) English
Application Note Proximity Detection and IR Ink (DN 35) English
Application Note Proximity Calibration and Test (DN 37) English
Application Note Colorimetry Tutorial (DN 20) English
Application Note Basic Pre-Production Light & Color Sensor Solution Validation Process English

Other information

Type Description Language
Block Diagram TMD2772WA Block Diagram English
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