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TMD3725 Color Sensor Module

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


  • RGB + IR filters
  • High sensitivity down to mLux levels
  • 0.18µm process technology with 1.8V I²C
  • 1M:1 dynamic range
  • Programmable proximity offset adjustment
  • Proximity automatic ambient light subtraction


  • Provides <10% CCT accuracy
  • Design flexibility for dark glass & placement
  • Reduces power consumption
  • Enables dark room to sunlight operation
  • Compensates for unwanted IR energy system crosstalk reflection
  • Compensates for unwanted ambient light photodiode current

Product parameters

Supply Voltage [V] 1.7 - 2.0
I²C Bus I²C - 1.8V
Programmable Gain, integration time, interrupt
Integrated Capabilities
Recommended Operating Distances
Temperature Range [°C] -30 to 85
Packages OLGA, pin count 8

General Description

The TMD3725 features advanced proximity measurement, color sense (RGBC+IR), and digital ambient light sensing (ALS). The package has been designed to accommodate a “single hole” aperture approach. The slim 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 color photodiodes have UV and IR blocking filters and converts photodiode current into dedicated integrating data converters producing 16-bit data. This digital output can be interfaced with a microprocessor where illuminance and color temperature can be calculated to control a displays backlight and chromaticity.

This product suits for the following applications:

  • Display backlight control
  • Color temperature sensing to assist backlight, camera, and flash control
  • Ambient light sensing
  • Single hole proximity sensing


Name Type Description Language Application Data EVM documentation v1_5 English Software EVM USB stick content v1_5 (documentation included in installer) English

Technical Documents

Name Type Description Version Language
ColorProxDetect_ColorProxDetectMod_AN000520_1-00.pdf Application Note Lux and CCT Calculations (DN 40) 1-00 English
LightSensors_AN000519_1-00.pdf Application Note Colorimetry Tutorial (DN 20) 1-00 English
ColorProxDetect_ColorProxDetectMod_AN000533_1-00.pdf Application Note Compensating for Light Flicker on Optical Sensors (DN 22) 1-00 English
ColorProxDetect_ColorProxDetectMod_AN000260_1-00.pdf Application Note Improving Color Sensor Lux Accuracy 1-00 English
TMD3725_BD000177_1-00.png Block Diagram TMD3725 Block Diagram 1-00 English
TMD3725_DS000567_3-00.pdf Datasheet Document version 1-05 3-00 English

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