AN4241

Protections

Doc ID 024193 Rev 1

13/18

At power-up, the device is in undervoltage status: the power bridges of the device are kept

disabled until the supply voltage is below the turn-on threshold. In this condition all the

commands enabling the bridges (e.g. Move, Run, GoTo, HardStop, etc.) are ignored and the

UVLO failure flag is forced low.

When the turn-on threshold is reached the power bridges are operative. The UVLO flag is

kept low until it is released through a GetStatus command.

The device returns in undervoltage status if the supply voltage falls below the turn-off

threshold.

Figure 8.

Undervoltage protection

Turn-on threshold

VS

Time

Power bridges

are kept disabled.

to zero.

Power bridges

are kept disabled.

Power bridges can be enabled.

it is released (GetStatus command).

Power bridges can be enabled.

it is released (GetStatus command).

Turn-off threshold

the UVLO flag is forced

to zero.

the UVLO flag is forced

The UVLO flag is kept to zero until

The UVLO flag is kept to zero until

AM16594v1