2.8

Power sequence

2.8.1

Power up and boot sequence

There are two options available for device power up/boot.

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 GPIO (using the XSHUT pin).

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

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 figure below. In this case, the

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

Note:

Note:

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

Note:

The VL53L3CX must only exit reset when there is no existing I2C transaction taking place on the bus i.e. do not

raise the XSHUT when there is an existing I2C command in progress, wait until the current I2C command has

completed.

VL53L3CX

Power sequence

DS13204 - Rev 2

page 9/35