The Optoelectronics Group of Vishay Intertechnology has introduced two fully integrated proximity sensors designed to increase efficiency and performance in consumer and industrial applications. They feature an IR emitter and a vertical cavity surface-emitting laser (VCSEL).
The Vishay Semiconductors VCNL36821S and VCNL36826S each combine a photodiode, signal processing IC, and 12-bit ADC in a compact 2.55 mm by 2.05 mm by 1.0 mm surface-mount package.
Compared to previous-generation devices, these proximity sensors offer smaller packages at a lower cost, making them ideal for space-constrained battery-powered applications, such as detecting if users are wearing or not wearing earpods or virtual reality / augmented reality (VR / AR) headsets.
With ranges to 300mm, they also provide collision detection in toys and consumer and industrial robots. The sensors feature low power consumption down to 6 µA to increase efficiency in these applications.
The devices support the I²C bus communication interface for easy access to the proximity signal, while their programmable interrupt function allows designers to specify high and low thresholds to reduce the continuous communication with the microcontroller.
The proximity sensors use intelligent cancellation to eliminate cross-talk, while a smart persistence scheme ensures accurate sensing and faster response time. The IRED and VCSEL wavelengths peak at 940nm and have no visible "red-tail."
The VCNL36821S and VCNL36826S offer temperature compensation from -40°C to +85°C, and a Moisture Sensitivity Level (MSL) of 3 — in accordance with J-STD-020 — for a floor life of 168 hours. The sensors are RoHS-compliant, halogen-free, and Vishay Green.