In summary, Vishay’s VCNL4040 is a fully integrated proximity and ambient light sensor featuring Filtron™ technology is one of the market's smallest surface-mount packages. Measuring only 4 mm x 2 mm x 1.1 mm, the VCNL4040 combines an IR emitter, photo detectors for proximity and ambient light, a signal processing IC, and a 16-bit ADC. The three-in-one sensor features an interrupt function, supports I2C bus communication interface, and greatly simplifies window and sensor placement in a wide variety of consumer applications. For smartphones, tablets, digital cameras, and other handheld consumer electronics, the Vishay Semiconductors VCNL4040 saves power as a proximity sensor by disabling touchscreens until a user is detected, while using its integrated ambient light function for display/keypad adaptive brightness control and backlighting. Containing the circuitry needed for these applications in one device, the VCNL4040 eliminates the need for additional light barriers and optical alignment of the IR emitter and photo diode.