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Smartphone hang-ups curbed by ST's proximity sensor

Posted: 04 Mar 2013 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? sensor system? dropped calls? smartphones?

Global semiconductor manufacturer STMicroelectronics has rolled out a unique sensor system which enhances the smartphone experience. The VL6180 is the first member of ST's FlightSense sensor line. It uses a new optical-sensing technology that reduces the incidence of dropped calls and enables innovative new user interactions with smartphones.

The VL6180 uses a ground-breaking proximity measuring technology to offer unprecedented accuracy and reliability in calculating the distance between the smartphone and the user. Instead of estimating distance by measuring the amount of light reflected back from the object, which is significantly influenced by colour and surface, the sensor precisely measures the time the light takes to travel to the nearest object and reflect back to the sensor. This "Time-of-Flight" approach ignores the amount of light reflected back and only considers the time for the light to make the return journey.

ST's latest sensor embeds both a robust ranging time-of-flight sensor and a wide dynamic ambient light sensor die, along with an infra-red emitter. Thanks to its all-in-one, ready- to-use architecture, the VL6180 is easy to integrate and saves the phone-makers long and costly optical and mechanical design optimisations.

The key to ST's patented new solution is an infra-red emitter that sends out light pulses, an ultra-fast light detector that picks up the reflected pulses, and electronic circuitry that accurately measures the time difference between the emission of a pulse and the detection of its reflection.

Addressing dropped calls is not the only benefit that ST's new technology brings to the smartphone market. The ability to measure a reliable absolute distance from the phone to a hand or other object opens up new user interaction scenarios that phone manufacturers and app developers can rapidly exploit.

Datasheet for the VL6180 can be found here.





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