FlightSense Sensor Enables Direct Distance Measurement Using Time-of-Flight of Photons

STMicroelectronics (ST) has launched the VL53L1X, a new time-of-flight (ToF) sensor that extends distance measurement range to 4 meters using FlightSense technology.

Unlike simple infrared (IR) technology that only measures signal strength and is susceptible to the reflectivity of objects, FlightSense sensors directly measure the distance to a target by utilizing the time-of-flight of photons reflected from the target, enabling precise distance measurement regardless of the surface characteristics of the target object.



The VL53L1X is ideal for applications requiring low power consumption and rapid distance measurement, such as wall-following navigation in robots (including vacuum cleaners), cliff detection, collision avoidance functions, as well as landing assistance and hovering functions in drones. It features a user-presence detection mode for power saving that provides automatic standby and approach wake-up capabilities, making it applicable to PCs, notebooks, and IoT products. Camera autofocus support and gesture recognition functionality are also possible. Other target applications include restroom automation-related applications such as toilets, faucets, and automatic hand sanitizer dispensers, as well as package counting-related applications that assist in inventory management for vending machines and smart shelf systems.

The fully integrated and miniaturized VL53L1X measures only 4.9 x 2.5 x 1.56mm, enabling deployment in space-constrained applications. It is backward compatible with the previous version VL53L0X, allowing for easy upgrades of existing products. Within the compact package are a SPAD (Single-Photon Avalanche Diode) optical receiver that provides industry-leading reliability and performance for ST's FlightSense sensor, as well as a laser driver and infrared emitter. The 940nm emitter operates within the non-visible spectrum to eliminate interfering light emissions and can be covered with a protective window that does not compromise measurement performance.

FlightSense is a technology that has been successfully established across various product markets worldwide. Based on this technology, the VL53L1X is currently in mass production, and sample requests and pricing inquiries can be made through ST's Korean office.