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TMD2725 Ambient Light Sensor

3-in-1 small aperture ambient light sensor, proximity sensor and IR LED in an optical module 1.8V I2C


  • 1.055mm emitter to detector distance
  • ALS and Proximity
  • 2mm x 3.65mm x 1mm
  • Integrated IR LED
  • Power management features
  • I²C fast mode interface compatible
  • Photopic ambient light sensor (ALS)
  • UV / IR blocking filters
  • Programmable gain and integration time
  • 1.8V power supply with 1.8V I2C bus


  • Meets small aperture requirements
  • Single device integrated optical solution
  • Accurate ambient light sensing
  • Reduced power consumption

Product parameters

Supply Voltage [V] 1.7 - 2.0
I²C Bus 1.8
Programmable Gain, integration time, interrupt
Integrated Capabilities ALS, Prox, IR LED
Recommended Operating Distances [cm] <15
Temperature Range [°C] -30 to 85
Packages Surface mount module, pin count 8

General Description

The device features advanced proximity measurement and digital ambient light sensing (ALS). The package has been designed to accommodate a single small aperture approach. The module incorporates an IR LED and factory calibrated LED driver. The proximity detection feature provides object detection (e.g. mobile device screen to user’s ear) by photodiode detection of reflected IR energy (sourced by the integrated LED). Detect/Release events are interrupt driven, and occur when proximity result crosses upper and/or lower threshold settings. The proximity engine features offset adjustment registers to compensate for unwanted IR energy reflection at the sensor. Proximity results are further improved by automatic ambient light subtraction. The ALS detection feature provides photopic light intensity data. The ALS photodiode has UV and IR blocking filters and a dedicated data converter producing 16-bit data. This architecture allows applications to ccurately measure ambient light which enables devices to calculate illuminance to control display backlight.

This product suits for the following applications:

  • Ambient light sensing
  • Single hole proximity detection for mobile phone touch screen disable


Title Category Headline Buy
TMD2725EvalKit Application Board Evaluation Kit for TMD2725


Name Type Description Language Software EVM USB stick v1-0 English

Technical Documents

Name Type Description Version Language
ALSProxDetectMod_AN000523_1-00.pdf Application Note Proximity Detection and Link Budget (DN38) 1-00 English
ALSProxDetectMod_AN000522_1-00.pdf Application Note Proximity Detection and IR Ink (DN 35) 1-00 English
ALSProxDetectMod_AN000521_1-00.pdf Application Note Proximity Calibration and Test (DN 37) 1-00 English
LightSensors_AN000519_1-00.pdf Application Note Colorimetry Tutorial (DN 20) 1-00 English
TMD2725_BD000161_1-00.png Block Diagram TMD2725 Block Diagram 1-00 English
TMD2725_DS000462_5-00.pdf Datasheet Document version 1-13 5-00 English
TMD2725_PD000194_1-00.png Other Product Document TMD2725EvalKit Image 1-00 English
TMD2725_PN000151_1-00.pdf Product Change Notification CN06-2018 (TMD2725) 1-00 English
TMD2725_QG000108_1-00.pdf Quick Start Guide EVM 1-00 English
TMD2725_UG000312_1-00.pdf User Guide ALS and Proximity Sensor Eval Kit 1-00 English

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