LX1973A

www.DataSheet4U.com TM ® LX1973A Automotive Light Sensor P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES ƒ Nearly Perfect Best Eye™ Human Eye Spectral Response ƒ 25C Dark Current <0.005 lux ƒ 5 Decades Compressed Output ƒ 10% Accuracy Over Temperature ƒ Scalable Output Voltage ƒ No Optical Filters Needed The LX1973A is a wide dynamic range light sensor with a very low dark current that is optimized for sensing low level light signals that typically occur under dark or darkening outdoor ambient lighting. The LX1973A has been optimized for automotive systems such as headlamp brightness control or rear view mirror contrast control. Its radical (fractional exponent) response when interfaced with an 8 bit DAC can detect levels down to 0.001 lux or levels as high as 500 lux. The spectral response of the integrated light sensor closely emulates the human eye so it ignores light such as infrared which emits energy but doesn’t aid vision. This eliminates the need for an Infrared filter required with competitor’s light sensors. The LX1973A internal circuitry consists of a diode array with Microsemi’s Best Eye™ processing that provides a nearly perfect photopic light wavelength response curve. The sensor output feeds into a wide dynamic range compression amplifier that provides accurate resolution over five decades of ambient light. The integrated dark current cancellation circuit facilitates accurate sensing of light below 0.01 lux. The current source output of the LX1973A can ...