2.6

Reading the results

The software driver provides turnkey functions to read output results after the measurement:

•

Signal rate

•

Ranging distance

•

Measurement status

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

2.7

Power sequence

There are two options available for device power up and boot sequence.

Note:

In all cases, XSHUT has to be raised only when AVDD is tied on.

Option 1

The XSHUT pin is connected and controlled from the host.

This option optimizes power consumption as the device can be completely powered off when not used, and then

woken up through the host (using the XSHUT pin).

HW Standby mode is the period when AVDD is present and XSHUT is low.

Figure 6. Power up and boot sequence

Note:

tBOOT is 1.2 ms maximum.

Option 2

The XSHUT pin is not controlled by the host; it is tied to AVDD through the pull up resistor.

When the XSHUT pin is not controlled, the power-up sequence is presented in the following figure. In this case,

the device goes automatically to SW STANDBY after FW BOOT, without entering HW STANDBY.

Figure 7. Power up and boot sequence with XSHUT not controlled

Note:

tBOOT is 1.2 ms maximum.

VL53L4CD

Reading the results

DS13812 - Rev 5

page 9/37