Tiny XYZ tri-stimulus light sensor balances visuals in consumer apps

Tiny XYZ tri-stimulus light sensor balances visuals in consumer apps

New Products |
By Graham Prophet

Providing digital measurements of illuminance (brightness) and chromaticity matching the CIE 1931 “Standard Observer” XYZ scale enabling True Color functionalities – which is the industry standard for quantifying the average human’s perception of light – the miniature TCS3430 may be used for functions such as display management, automatic white colour balancing or colour management.


Benefits to mobile devices include;

– Adapting the display colour and brightness towards warm or cool white, based on the Correlated Color Temperature (CCT) level of the environment

– High quality display calibration to provide colour balancing and vivid images based on the source input

– More realistic images and almost zero colour distortion from the camera, rivalling the colour balancing performance of professional-grade photography equipment


The TCS3430 uses ams’ technology for fabricating interferometric optical filters directly on the wafer. The ams interferometric filters can be made with the spectral characteristics of the XYZ spectral responsivity model of the human eye. In the TCS3430, the filters provide five channels: X, Y and Z channels and two infrared channels. The IR channels are used for advanced light source detection. The Y channel’s response to the green portion of the visible light spectrum provides a measure of illuminance, enabling the TCS3430 to operate as an ambient light sensor as well as a colour sensor.


The TCS3430 is supplied as a packaged IC measuring 2.41 x 1.75 x 1.00 mm. The aperture of the sensor needs to be covered by an achromatic diffuser. The TCS3430’s high sensitivity and wide dynamic range mean that it can be mounted behind dark or transparent cover glass. It operates from a 1.8V supply, and provides an I2C interface to a host processor.


The TCS3430 is available for sampling, with pricing of $1.59 (1,000). An evaluation kit is available.






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