Proximity sensor suits TWS earphones, AR/VR headsets

May 11, 2021 // By Rich Pell
Proximity sensor suits TWS earphones, AR/VR headsets
Semiconductor and passive electronic components manufacturer Vishay Intertechnology has introduced a fully integrated proximity sensor designed to increase efficiency and performance in consumer and industrial applications.

Featuring a vertical-cavity surface-emitting laser (VCSEL), the VCNL36825T combines a photodiode, signal processing IC, and 12-bit ADC in a compact 2.0 x 1.25 x 0.5-mm surface-mount package with a small 1.6 mm light hole. The device is offered as being ideal for consumer and industrial applications, including TWS earphones and virtual reality/augmented reality (VR/AR) headsets.

The new sensor is offered as having a 76% smaller package compared to previous-generation devices, while its reduced light hole opening provides increased design flexibility - all at a lower cost. The VCNL36825T’s small size, says the company, makes it ideal for space-constrained battery-powered applications, such as detecting if users are wearing or not wearing true wireless stereo (TWS) earphones or VR/AR headsets.

With a range of 200 mm, the device also provides collision detection in toys and consumer and industrial robots. It also features a low power consumption down to 6.63 µA, which increases efficiency in these applications.

The VCNL36825T supports the I 2C bus communication interface for easy access to the proximity signal, and its programmable interrupt function allows designers to specify high and low thresholds to reduce the continuous communication with the microcontroller. The proximity sensor uses intelligent cancellation to eliminate cross-talk, while a smart persistence scheme ensures accurate sensing and faster response time. The VCSEL wavelength peaks at 940 nm and has no visible "red-tail."

Temperature compensation is from -40°C to +85°C and Moisture Sensitivity Level (MSL) is 3 - in accordance with J-STD-020 - for a floor life of 168 hours. The sensor is RoHS-compliant, halogen-free, and Vishay Green.

Samples and production quantities of the VCNL36825T are available now, with lead times of eight to 12 weeks for large orders.

Vishay Intertechnology

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