2.2

State machine description

The following figure shows the device state machine.

Figure 5. Device state machine

2.3

Customer manufacturing calibration flow

Up to two calibrations are needed to ensure the best sensor performances. Offset needed in all applications. If a

cover glass is used, cross-talk calibration is needed also.

The detailed procedure is provided in the VL53L4CD Ultra Lite Driver user manual (UM2931).

2.4

Device programming and control

The device 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 VL53L4CD ultra lite driver user manual.

2.5

Digital processing and reading the results

Digital processing is the final operation of the ranging sequence that computes, validates or rejects a ranging

measurement.All the processing is performed by the VL53L4CD internal firmware. The software driver allows

reading the results when they are valid.

If the distance cannot be measured (no target or weak signal), a corresponding status error code is generated

and can be read by the host.

A full description of the status errors is provided in the VL53L4CD Ultra Lite Driver user manual (UM2931).

VL53L4CD

State machine description

DS13812 - Rev 5

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