A miniature optical sensor integrates VCSEL-based sensing and digital connectivity for proximity detection in space-constrained wearable and smart-device designs.
Vishay Intertechnology has introduced the VCNL36829UM, a compact proximity sensor that combines a vertical-cavity surface-emitting laser (VCSEL) with a proximity-sensing element in a single package. The device is designed for applications where proximity detection must fit into increasingly small electronic assemblies, including true wireless stereo (TWS) earbuds, augmented and virtual reality headsets, smart glasses, and connected wearable devices.
The sensor integrates its VCSEL emitter and proximity sensor, reducing the number of separate optical components required in a design. It communicates with a host processor through an I²C interface, allowing proximity information to be incorporated into a device’s control and power-management functions. This makes it suitable for electronics that need to detect the presence or position of nearby objects while maintaining a compact system architecture.
The key features are:
- VCSEL-based optical sensing architecture
- Integrated proximity detection circuitry
- Ultra-thin 0.35-mm profile
- Transparent package with isolation wall
- Dedicated I²C digital interface
The device is housed in a transparent mold package with an isolation wall, with dimensions of just 1.6 × 1.0 × 0.35 mm. Its ultra-thin construction can help designers accommodate sensing functionality in products where board area and component height are tightly constrained. The integrated optical architecture also supports placement in small form-factor products without requiring a separate external light source and sensing element.
For TWS earbuds, proximity sensing can support functions that respond to whether an earbud is being worn or removed. In smart glasses and AR/VR headsets, the sensor can provide proximity information for device interaction and operating-state control. Wearables and IoT products can similarly use the sensor to detect nearby objects while keeping the electronics compact.
It thereforetargets a growing class of miniaturised electronics in which sensing, optical integration, and low-profile packaging need to coexist within limited mechanical space. Its combination of integrated VCSEL and proximity sensing, digital interfacing, and ultra-thin packaging gives designers a compact approach to adding proximity detection to next-generation wearable and IoT hardware.
