DRV8718-Q1: question about DRVOFF/nFLT pin and IC_STAT1[FAULT] bit

Jay wang

Expert 3221 points

Part Number: DRV8718-Q1

Tool/software:

hi expert

as we know, DRVOFF/nFLT pin is a multi-function pin and, by default, the pin functions as a global driver disable pin.

additionally, 8718 has IC_STAT1[FAULT] bit to Mirrors nFAULT pin.

So my question is that in default configuration(DRVOFF function) what is IC_STAT1[FAULT] bit function? does this pin shown DRVOFF/nFLT state?

11 months ago

0 Jay wang 11 months ago

TI__Expert 3221 points

Adding a question:

how to understand FAULT bit "Mirrors nFAULT pin."

if nFAULT pin is 1, then FAULT bit is 0;

if nFAULT pin is 0,then FAULT bit is 1?

am i right?

0 Murugavel4637 11 months ago in reply to Jay wang

TI__Mastermind 45465 points

Hi Jay,

Jay wang said:
So my question is that in default configuration(DRVOFF function) what is IC_STAT1[FAULT] bit function? does this pin shown DRVOFF/nFLT state?

The FAULT bit is set if there is a fault detected in the IC operation for example an UV or OV or POR. It does not reflect the status of the pin while in default DRVOFF function configuration.

Jay wang said:
how to understand FAULT bit "Mirrors nFAULT pin."

if nFAULT pin is 1, then FAULT bit is 0;

if nFAULT pin is 0,then FAULT bit is 1?

am i right?

Yes you are correct. Thank you.

Regards, Murugavel

0 Jay wang 11 months ago in reply to Murugavel4637

TI__Expert 3221 points

hi expert

i have a further question about this words:

Murugavel4637 said:
It does not reflect the status of the pin while in default DRVOFF function configuration.

so if DRVOFF/nFLT is used for DRVOFF function. and designer make DRVOFF low So IC_STAT1[FAULT] will be 1 during NO UV or OV or POR situation, right?

0 Murugavel4637 11 months ago in reply to Jay wang

TI__Mastermind 45465 points

Hi Jay,

Jay wang said:
so if DRVOFF/nFLT is used for DRVOFF function. and designer make DRVOFF low So IC_STAT1[FAULT] will be 1 during NO UV or OV or POR situation, right?

The IC_STAT1 FAULT bit will be 0b, for no faults detected. When there is a fault detected the FAULT bit in IC_STAT1 will be 1b, indicating a fault is present.

DRVOFF function for the pin is an independent input function to enable and disable the output bridges. It will not affect the IC_STAT1 FAULT bit status.

Regards, Murugavel

Motor drivers

Motor drivers forum

DRV8718-Q1: question about DRVOFF/nFLT pin and IC_STAT1[FAULT] bit