Sensors Digital colour sensing chip is tiny
27th January 2014
Intersil colour sensor
Intersil has announced a light-in digital-out colour photometric chip.
Called ISL29125, and measures only 1.65×1.65mm, it is intended to be used alongside displays, monitoring ambient light so the perceived display colour and intensity can be maintained.
“Specifically, in OLED display TV applications, it can be used to adjust the blue organic material ageing profile to maintain consistent contrast and brightness throughout the life of the display,” said the firm.
Dynamic range is 5.7mlux to 10klux, in two ranges: 0.0057 to 375lux, and 0.152 to 10,000 lux, measured through an internal integrating 16bit ADC operating at 100ms/colour.
Part-to-part variation of RGB output is said to be less than +/-10%
Operating is over -40 to +85°C from 2.25V to 3.63V, using 85uA, or 0.5uA when shut down.
The digital interface is I2C, needing pull-ups to between 1.7 and 3.63V.
There is an evaluation board and a presentation on the chip.
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