Proximity sensor delivers 33% increase in detection distance

16th September 2019
Mick Elliott

A proximity sensor that offers a sensing distance of up to 30cm has been released by the Optoelectronics group of Vishay Intertechnology. Combining an IR emitter, photo detectors for proximity, amplifiers, and ADC circuitry into a single package, the Vishay Semiconductors VCNL3040 features a programmable interrupt function.

It supports the I²C bus communication interface for efficient object and collision detection in a wide variety of consumer and industrial applications.

Ideally suited for use in smart home, industrial, office, and toy products, the device released today provides a 33% increase in proximity detection distance compared to previous-generation sensors at a lower cost than similar solutions on the market. Applications include presence detection to activate displays in printers, copiers, and home appliances; collision detection in robots and toys; vehicle occupancy detection in parking lots; and proximity detection in lavatory appliances.

The VCNL3040's programmable interrupt function allows designers to specify high and low thresholds, which reduces the continuous communication with the microcontroller. Featuring selectable 12-bit and 16-bit outputs, the proximity sensor uses intelligent cancellation to eliminate cross-talk, while a smart persistence scheme ensures accurate sensing and faster response time.

The emitter wavelength peaks at 940 nm and has no visible "red-tail."

The device offers a supply voltage range of 2.5V to 3.6V, an I²C bus voltage range from 1.8V to 3.3V, and excellent temperature compensation from -40°C to +85°C.

Offered in a lead-free 8-pin QFN package, the sensor is RoHS-compliant, halogen-free, and Vishay Green.

Samples and production quantities of the new VCNL3040 are available now, with lead times of eight to 12 weeks for large orders.

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