VL53L0X datasheet(15/40 Pages) STMICROELECTRONICS

15 / 40 page

DocID029104 Rev 1

15/40

VL53L0X

Functional description

Note:

The minimum range timing budget is 20ms. Maximum is 5 seconds. The longer the timing

budget, the higher the accuracy and the ranging distance capability.

2.6.3

Digital housekeeping

Digital processing (housekeeping) is the last operation inside the ranging sequence that

computes, validates or rejects a ranging measurement. Part of this processing is performed

internally while the other part is executed on the Host by the API.

At the end of the digital processing, the ranging distance is computed by VL53L0X itself. If

the distance could not be measured (weak signal, no target…), a corresponding error code

is provided.

The following functions are performed on the device itself:

• Signal value check (weak signal)

• Offset correction

• Cross-talk correction (in case of cover glass)

• Final ranging value computation

While the API performs the following:

• Return Ignore Threshold RIT check (Signal check versus cross talk)

• Sigma check (accuracy condition)

• Final ranging state computation

If the user wants to enhance the ranging accuracy, some extra processing (not part of the

API) can be carried out by the host, for example, rolling average, hysteresis or any kind of

filtering.

2.7

Getting the data: interrupt or polling

User can get the final data using a polling or an interrupt mechanism.

Polling mode: user has to check the status of the ongoing measurement by polling an API

function.

Interrupt mode: An interrupt pin (GPIO1) sends an interrupt to the host when a new

measurement is available.

The description of these 2 modes is available in the VL53L0X API User Manual.

2.8

Device programming and control

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

A software layer (API) is provided to control the device. The API is described in the

VL53L0X API User Manual.

VL53L0X датащи(PDF) 15 Page - STMicroelectronics