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Illumination & Displays

Photo-IC light sensor

Toshiba America Electronic Components, Inc. (TAEC) introduces the TPS859, a new ultra-compact device, to its family of photo-IC ambient light sensors (ALS). Developed by Toshiba Corp. (Toshiba) the new photo-IC sensor incorporates a photodiode, a current amplifier and a luminous-efficiency correction (LEC) function in a single chip that is ideal for use in flat panel displays and various home appliances, and is also suitable for use in cell phones, notebook PCs, PDAs, camcorders, digital cameras, and other equipment requiring luminosity adjustment. The sensor can be used to turn a keypad or LCD backlight on or off, or adjust the brightness according to the ambient light condition.

The TPS859 provides ultra-high sensitivity with light current (IL) of 230microA(1) compared with 40microA(1) in the previous generation TPS852 -- an almost 6x improvement. The device also employs a new optical filtering technology which achieves luminous efficiency near to that of the human eye. The filter is able to reduce the ratio of incandescent to fluorescent light sensitivity (IL) from 1.2 (typ.) in the TPS852 to 1.0 (typ.) for the TPS859. The combination of the 16 percent improvement in the sensitivity ratio and the six-fold increase in sensitivity makes TPS859 the most robust device in the Toshiba ALS product line.

With excellent output linearity across various light sources, Toshiba's RoHS-compatible(2) TPS859 photo-IC ALS features an ultra-compact surface-mount package that measures 1.6 x 1.6 x 0.55 mm. The TPS859 can operate from 1.8V to 5.5V, which makes it ideal for battery-powered applications.