Light/colour/proximity sensor works through attenuating glass

December 04, 2014 // By Graham Prophet
Distributor Farnell element14 has the Avago APDS-9950, a sensor providing red, green, blue and clear (RGBC) light sensing and proximity detection 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 operations for accurate distance detection. For example, it can be used to enable a mobile phone to detect when the user positions the device close to the ear.

The 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 in between proximity and RGBC measurements, providing very low average power consumption.

The colour-sensing feature is useful in applications such as LED RGB backlight control, solid-state lighting, reflected LED colour sampler and fluorescent light colour temperature detection. The integrated IR blocking filter also makes the APDS-9950 an ambient light sensor and colour temperature monitor sensor.

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