Ambient light sensor controls the brightness for in-car displays
The SFH 5701 A01 does not require a separate power supply pin as the active IC is powered by the signal current from ambient light detection. Hence the chip only has two pins instead of three or more, making it much easier to connect and operate. The special filter encapsulation of the SFH 5701 A01 lets mainly green light through and filters out infrared wavelengths very efficiently. This ensures that the surface-mountable component is well adapted to the spectral sensitivity of the human eye, which also is most sensitive to light in the 
green range of the colour spectrum. Overall, the sensor detects light in the 450 to 700 nm visible spectrum. SFH 5701 A01 is an analog component with a linear integrated amplifier which supplies a typical signal of 135 µA at 100 lux. The high dynamic range and high sensitivity at low illuminance of 0.01 lux combine to produce reliable light measurements for a wide range of ambient light conditions. With a footprint of only 1.25×2.0x0.8mm, the ambient light sensor delivers precise measurements even behind dark glass or plastic covers.
Osram Opto Semiconductors – www.osram-os.com
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