ams – TMD3782x: ams Integrated Color Sensor Drives New Intelligent Display Management in Smartphones and Tablets

The TMD3782x device will perform color temperature measurement, ambient light sensing (ALS) and proximity detection with background light rejection. The device detects light intensity under a variety of lighting conditions and through a variety of attenuation materials, including dark glass.

The proximity detection feature allows a large dynamic range of operation for accurate distance detection, such as in a cell phone when the user positions the phone close to their ear. IR LED sink current is factory trimmed to provide consistent proximity response without requiring customer calibrations. An internal state machine provides the ability to put the device into a low power state between proximity and RGBC measurements, providing very low average power consumption.

The color sensing feature is useful in applications such as backlight control, solid state lighting, reflected LED color sampler, or fluorescent light color temperature detection. The integrated IR blocking filter makes this device an excellent ambient light sensor, color temperature monitor, and general purpose color sensor.


  • Mobile phone touchscreen control
  • Ambient light sensing
  • Light color temperature sensing
  • Medical diagnostics
  • Optical switch
RGB, ALS and Proximity Support

  • Power management features
  • I2C fast mode interface compatible
  • Integral IR LED
  • Small 8-lead optical module

Color Temperature and ALS

  • UV and IR blocking filters
  • Programmable gain and integration time
  • 1,000,000:1 dynamic range

Equal Response to 360o Incident Light

  • Circular segmented RGBC photodiode

Ideal for Operation Behind Dark Glass

  • Very high sensitivity

Proximity Detection with Integrated IR LED

  • Background ambient light rejection
  • Factory trimmed, consistent response
  • Programmable current sink for IR LED drive