Electronic Design

Light Sensors Target Control Of LCD Brightness

Three ambient-light sensors can be used by designers to control the brightness of LCDs and to reduce power consumption in consumer electronics applications by controlling keypad backlights. Using a simple two-pin connection, the sensors are well-suited for automotive applications like automatic headlight control, tunnel sensors, and displays that adjust according to changes in ambient brightness. As photoresistors, the sensors require no external amplifier.

The three devices feature different package configurations. The TEMT6200F (surface-mount 0805 has an angle of half-intensity of ±60 deg. The TEPT5700 (leaded 5-mm flattop) angle of half intensity is ±50 deg. The TEPT4400 (a 3-mm package) has a ±30-deg. angle of half intensity. The TEMT6200F peak wavelength sensitivity is 550 nm, while the TEPT5700 and TEPT4400 peak sensitivity is at 570 nm, green-yellow on the visible spectrum. The sensors are RoHS-compatible alternatives to cadmium-based photoresistors. They are also lead-free in accordance with RoHS and WEEE directives.

Samples of the light sensors are available now, with six-week lead times.

The sensors cost $0.25 each in quantities of 1 million or more for U.S. delivery.

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