The VCNL40x0 sensors are fully integrated proximity and ambient light sensors. They combine an infrared emitter and PIN photodiode for proximity measurement, ambient light sensor, and signal processing IC in a single package with a 16 bit ADC. The devices provide ambient light sensing to support conventional backlight and display brightness auto-adjustment, and proximity sensing to minimize accidental touch input that can lead to call drops and camera launch for smart phones. With a range of up to 20 cm (7.9″), these stand-alone, single components greatly simplify the use and design-in of a proximity sensor in consumer and industrial applications because no mechanical barriers are required to optically isolate the emitter from the detector. The sensors feature a miniature leadless package (LLP) for surface mounting with a low profile of 0.75 mm for VCNL4000 and VCNL4010 and 0.83mm for VCNL4020 and VCNL3020. Through the standard I2 C bus serial digital interface, they allow easy access to a “Proximity Signal” and “Light Intensity” measurement without complex calculations or programming. All versions besides the VCNL4000 offer a programmable interrupt function which may be used as a wake-up function for the microcontroller when a proximity event or ambient light change occurs; reducing processing overhead by eliminating the need for continuous polling.
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