Vishay’s circuit diagrams for VCNL4000, VCNL4010 and VCNL4020 sensor boards

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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