A new miniature reflective optical sensor capable of operating in bright sunlight, and that integrates touch and proximity functions has been developed by Vishay Intertechnology.
The TCND3000 surface-mount optical sensor operates in conjunction with an IC built on Elmos Semiconductor's HALIOS (high ambient light independent optical system) technology to provide reliable operation in bright sunlight up to 200 kLux.
Said to offer designers a low-cost alternative to mechanical switches, the TCND3000 series enables improvements in the design and functionality of electronic systems such as mobile phones, automotive systems, home appliances, and cameras. The device combines an IR emitter as the source for the touch/proximity signal, another for compensation for ambient light, and a photo-diode as the receiver for the touch/proximity signal. Proximity detection is possible at a distance of 2 cm and touch detection at a distance of 1 cm. The self-adjusting system compensates for environmental disturbances such as ambient light, ageing of optical components, and surface impurities or scratches.
TCND3000 sensors measure 5 by 2,6 mm with a height of 3 mm. They are RoHS-compliant devices available in lead (Pb)-free surface-mount-style package. Each features a 5 V operating voltage, a ±20° angle of half-sensitivity, an 870 nm operating wavelength, and an operating temperature range of -40 to +85°C.
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