The APDS-9002 is a low-cost analog-output ambient light photo sensor in lowest cost miniature chipLED lead-free surface mount package. It consists of a spectrally suited phototransistor, which peaks in human luminosity curve. Hence, it provides an excellent responsivity that is close to the response of human eyes, as shown in Figure 2. It provides a design-alternative to the HSDL-9000 digital-output ambient light photo sensor is suitable for portable applications with its ultra small package design. The APDS-9002 is ideal for applications in which the measurement of ambient light is used to control display backlighting. Mobile appliances such as the mobile phones and PDAs that draw heavy current from display backlighting will benefit from incorporating these photo sensor products in their designs by reducing power consumption significantly.