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Light sensor automates car's LCD control

Posted: 12 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:sensor light? photodiode? automotive LCD?

Vishay Intertechnology Inc. has introduced a photodiode-based ambient light sensor in a compact 0805-sized surface-mount package, featuring a small 0.85mm profile and simple 2-pin connection. The new TEMD6200FX01 reacts to light like the human eye to allow automatic control of LCD brightness and keypad backlighting, and to enable automotive safety and driver comfort features.

The TEMD6200FX01 uses Vishay IR filtering epoxy technology to match the spectral sensitivity of the human eye with minimal sensitivity to light beyond the visible range. For consumer electronics, the device reduces power consumption by turning on keypad backlights only in low ambient conditions and controlling LCD display brightness to optimize viewing, based on ambient light.

Designed and qualified to automotive standard AEC-Q101, the TEMD6200FX01 enables automatic headlight control, tunnel sensors and displays that adjust automatically to changes in ambient brightness. The sensor is also more "environmentally friendly" than cadmium-based photo resistors, the elimination of which has been mandated by RoHS legislation.

The device offers an angle of half sensitivity of 60, a radiant sensitive area of 0.3mm?, and a peak wavelength sensitivity of 540nm. Lot-to-lot repeatability over the extended operating temperature range of -40 to +100C allows customers to eliminate calibration steps in manufacturing processes.

To enable a floor life of 168hrs without concern for absorption, the TEMD6200FX01 offers a moisture sensitivity level of 3, in accordance with J-STD-020. The device is Pb-free and provides Pb-free processing capability in accordance with RoHS 2002/95/EC and WEEE 2002/96/EC.

Samples and production quantities of the TEMD6200FX01 are available now, with lead times of four to six weeks. Pricing for U.S. delivery in 5,000-piece quantities is $0.35 per piece.

- Rick DeMeis
Automotive DesignLine

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