LX1973B

LX1973B ® Automotive Light Sensor TM PRODUCTION DATA SHEET WWW.Microsemi .COM DESCRIPTION The LX1973B is a wide dynamic The LX1973B internal circuitry range light sensor with a very low consists of a diode array with dark current that is optimized for Microsemi’s Best Eye™ processing that sensing low level light signals that provides a nearly perfect photopic light typically occur under dark or darkening wavelength response curve. The sensor outdoor ambient lighting. output feeds into a wide dynamic range The LX1973B has been optimized compression amplifier that provides for automotive systems such as accurate resolution over five decades of headlamp brightness control or rear ambient light. The integrated dark view mirror contrast control. Its current cancellation circuit facilitates radical (fractional exponent) response accurate sensing of light below 0.01 when interfaced with an 8 bit DAC Lux. The current source output of the can detect levels down to 0.001 Lux LX1973B can be gain scaled using one or levels as high as 500 Lux. external resistor. The spectral response of the The LX1973B is internally trimmed integrated light sensor closely to an initial accuracy of 5% at room emulates the human eye so it ignores temperature and a light level of 10 Lux. light such as infrared which emits Accuracy of 10% is maintained over the energy but doesn’t aid vision. This full temperature range (-40 to +85ºC). eliminates the need for an Infrared filter require...