Time-of-flight sensor light pulse delivers depth accuracy

27th August 2020
Mick Elliott

The ams TMF880, which is available from Digi-Key Electronics is a true direct time-of-flight (ToF) sensor system in a single modular package.

It offers highly accurate depth accuracy detection through a sub-nanosecond light pulse and an anti-aliasing stopwatch method to measure round-trip time of pulse.

It also provides single-zone detection of an object irrespective of the colour, reflectivity, or texture of the object. The single module with VCSEL emitter offers high dynamic range and detection sensing measurements from 2 cm to 250 cm distances.

The device utilises highly sensitive SPAD detection with fast compact time-to-digital converters to make highly accurate distance measurements within ±5% and is capable of operation in either dark environments or the presence of sunlight.

A built-in histogram is featured to detect cover glass and reports object distances operating with the highest SNR while compensating for dirt and smudge contaminants on a product’s cover glass to produce artifact-free measurement.

The histogram delivers dynamic cover glass calibration and crosstalk compensation and background light noise is minimized through on-chip sunlight rejection filters.

Data output is through a 1.8 V I²C fast-mode communications interface and an integrated microcontroller is featured with all algorithms included on-chip with no need for external optics.

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