The analog ALS is a low cost ambient light sensor, consisting of photodiode, phototransistor or photo IC in miniature SMD. EVERLIGHT ALS series product s a re a good effective solution to the power saving of display backlighting of mobile appliances, such as the mobile phones, NB and PDAs. Due to the high rejection ratio of infrared radiation, the spectral response of the ambient light sensor is close to that of human eyes.