VL53L1 datasheet(10/39 Pages) STMICROELECTRONICS

10 / 39 page

Functional description

VL53L1

10/39

DocID029631 Rev 12

2.3

Customer manufacturing calibration flow

The detailed procedure is provided in the VL53L1 driver user manual (UM2133).

2.4

Device programming and control

The VL53L1 physical control interface is I2C, described in Section 3: Control interface.

A software layer (driver) is provided to control the device. This avoids complex I2C register

operations with turnkey functions to start, stop and read the ranging values.

The driver structure and functions are described in the VL53L1 driver user manual

(UM2133).

2.5

Description of operating “preset” modes

The VL53L1 software driver proposes four turnkey operating modes (called “preset”) to

allow fast and easy ranging in all customer applications:



Ranging mode



Multizone scanning mode



Lite ranging mode



Autonomous mode

Ranging mode is the default (recommended) configuration to the get best of the VL53L1

functionalities.



Ranging mode is natively immune to coverglass crosstalk and smudge beyond



80 cm. With patented algorithms (direct Time-of-Flight), a temporal filtering is possible

to distinguish crosstalk from object signal over long distance > 80 cm. Best-in-class

ranging performance of 300 cm+ with coverglass in place is now possible, and can be

reached with any computation unlike other sensors in the market.



Ranging mode can detect several objects concurrently within the FoV. Up to four

ranges can be output simultaneously by the software driver, to indicate objects range.

Check the latest software driver manual for further details.



Ranging mode is compatible with ROI (region of interest) selection: the user may chose

a custom FoV by software, from 4x4 SPADs (minimum size) up to 16x16 SPADs (full

FoV). This gives full flexibility to support “touch-to-focus” or custom ranging.



Ranging operation is performed by default at 60 Hz once the driver function is called

(typical ranging operation lasts 16 ms). It includes internal housekeeping, ranging and

post-processing.

Multizone scanning mode provides ranging results of all selected ROIs sequentially:

quadrant (4 zones), 9 zones, 16 zones or custom number of zones and location. In each

ROI the VL53L1 system can also detect multiple objects, and the software driver returns a

ranging quality level and signal, in addition to the distance in millimeters.

Lite ranging mode is recommended to minimize the post processing with a low-

performance host (microcontroller or low frequency CPU).

Autonomous mode triggers ranging interrupts under certain conditions: the user can set

distance thresholds, signal thresholds, and a timing interval between two consecutive

ranging operations.

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