Low-Cost Proximity Sensor Responds Within 5ms


Vishay Intertechnology introduced a fast, low-cost infrared (IR) sensor which offers proximity sensing from 10 cm to 2 m and a > 4x dynamic range from its lowest to highest sensitivity for a variety of systems including sensing of distance to objects for toys, drones, autonomous robots, and intelligent vicinity switches. Other applications of the TSSP4056 are hand dryers, towel or soap dispensers, water faucets, vending machine fall detection, and security and pet gates.

The sensor features a monotonic sensitivity vs. frequency response curve from 30kHz to 54kHz. Modulated pulses from a separate IR emitter are detected with a high sensitivity of 0.4 mW/m². Also, fast readings in under 5 ms are possible using successive approximation techniques.

Most proximity sensors require an expensive DAC to detect the object’s distance. However, this new sensor doesn’t require the microcontroller to contain a DAC, thus lowering overall costs. Other benefits of the device is simplified design by embedding a PIN photodiode and sensor IC in a compact package measuring 6.0 x 6.95 x 5.6 mm.


Capable of operating at a supply voltage range from 2.5V to 5.5V and a typical supply current of 0.7 mA, the sensor can receive IR pulses from an emitter with a peak wavelength of 940 nm. Other features are insensitivity to supply voltage and ripple noise, and shielding against EMI. An IR filter suppresses visible light. The sensor is RoHS-compliant, halogen-free, and Vishay Green.

The IR sensor module is available now, with lead times of four weeks.

Click here to view full Press release.

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