Proximity sensor combines IR emitter, photo-pin-diode, signal processing IC and 16-bit ADC
The chip supports an easy-to-use I²C bus communication interface, and it features an interrupt function and an integrated external emitter driver to extend the sensor’s range. The VCNL3020’s 16-bit effective resolution for proximity detection ensures excellent cross talk immunity, eliminating the need for a mechanical barrier between the emitter and detector. While other products only achieve object detection up to 100 mm, the sensor’s programmable LED drive current from 10 mA to 200 mA (in 10 mA steps) allows distances up to 200 mm, and to more than a meter when the integrated emitter driver is used to drive external emitters. The VCNL3020 offers excellent ambient light immunity by modulating the emitter signal.
The device’s interrupt function enables the sensor to work independently until a programmable threshold value occurs, and then it wakes up the microcontroller.
For mobile devices, the VCNL3020 saves power as a proximity sensor for touch screen locking. The device serves as an optical switch for computing and industrial devices and displays. It draws 1.5 µA IN standby and operates from 2.5 to 3.6V. The sensor operates over a temperature range of – 25 to + 85°C.
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