A Digital Double Pack
Nov 5, 2010 The SFH 7770 from OSRAM Opto Semiconductors combines the functions of a digital ambient light sensor with those of a digital proximity sensor. It determines the ambient brightness, detects the presence of an object nearby and can even tell whether the object is moving closer or moving further away.
The digital SFH 7770 sensor replaces the usual separate ambient light and proximity sensors and takes up very little space, measuring just 2.8 x 2.8 x 0.9 mm. At the same time by combining the two functions it offers added performance and consumes only 350 µA during operation and only 5 µA in stand-by mode.
The proximity sensor uses the reflection of the emitted light from a separate IR LED. Its high sensitivity in the range from 1 µW/cm² to 10 mW/cm² allows it to operate at large distances of up to 30 cm. With its digital output the sensor supports the high-speed I²C bus at up to 3.4 MHz.
When it measures brightness the integrated ambient light sensor immediately returns a lux value of between 3 and 65,000 lx so that the display brightness can be adapted precisely to the ambient light conditions. This makes the display easier to read and increases the time between battery recharges.
By using two further IR LEDs it is possible to detect gestures with the SFH 7770.
OSRAM presents the SFH 7770 for the first time on electronica (9. to 12. November, München) at booth107 in hall A3.
Author: BIO T&T
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