STMicroelectronics Launches VL53L3CX: Advanced Multi-Target Time-of-Flight Sensor with Smudge-Free Accuracy

STMicroelectronics has expanded the capabilities of its FlightSense time‑of‑flight (ToF) ranging sensors with patented histogram algorithms that enable accurate distance measurement to multiple objects and improve overall precision.

The new VL53L3CX, built on ST’s third‑generation FlightSense technology, measures distances from 2.5 cm to 3 m regardless of target color or reflectance—unlike conventional infrared sensors. This allows designers to add features such as occupancy detectors that deliver error‑free sensing by ignoring unwanted background or foreground objects, or to report exact distances to multiple targets within the sensor’s field of view.

It combines a high‑performance proximity and ranging sensor with multi‑target distance measurements and automatic smudge correction. The miniature, reflowable package houses a single‑photon avalanche diode (SPAD) array and physical infrared filters to deliver optimal ranging performance in a variety of ambient lighting conditions, supported by a range of cover‑glass windows.

The VL53L3CX delivers high‑performance proximity and ranging, multi‑target distance measurements, and automatic smudge correction (Image: STMicroelectronics)

Thanks to patented histogram algorithms and innovative module construction, the VL53L3CX can detect distinct objects within its field of view (FoV) with depth understanding. The algorithms enhance cover‑glass crosstalk immunity and enable real‑time smudge compensation, protecting accuracy in environments such as dusty industrial settings or vacuum cleaners. Ranging performance is also improved under ambient lighting.

In addition, the VL53L3CX offers superior linearity, boosting short‑distance measurement accuracy for applications like wall tracking, rapid cliff detection, and obstacle avoidance in service robots and robotic vacuum cleaners—markets where ST ToF sensors are already trusted. The compact, all‑in‑one package eases integration, while low power consumption—typical active ranging power of 16 mA and standby of 5 µA—extends battery life.

ToF sensing elevates performance across a broad spectrum of applications: from reliable occupancy detection in building automation and lighting control to smarter proximity sensing in IoT endpoints, convenient auto‑wake in portable devices, and robust user detection in automatic sanitary equipment. With high accuracy and fast response times, ToF sensors also enhance precise movement control in robotics and indoor drones.