3.2

State machine description

The following figure shows the device state machine.

Figure 5. Device state machine

3.3

Customer manufacturing calibration flow

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

cover glass is used, crosstalk calibration is also needed.

3.4

Device programming and control

The I²C is the physical control interface of the device. It is described in Section 4: Control interface.

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

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

3.5

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 VL53L4ED internal firmware. The software driver allows

reading the results when they are valid.

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

code is generated. Te host can read this code.

VL53L4ED

Functional description

DS14256 - Rev 3

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