UCD90320: GPI signal does not shutdown a rail.

Ben Kemper

Part Number: UCD90320

Hi,

I have a temperature fault signal defined on several GPI pins (in my design TEMP_ALERT_FP0-4 on GPI 11-15). If this signal goes high, a rail must shutdown.

See definition below.

Then in the Rail configuration->fault responses tab:

Here I set the GPI11-15 to shutdown the rail. The problem is that when a GPI pin goes high, nothing happens? But the rail shut shutdown....

What am I doing wrong?

Preview attachment UCD90320 @ PMBus Address 113d Project.xml

UCD90320 @ PMBus Address 113d Project.xml

882 KB

Kind regards,

Ben

over 3 years ago

0 Ben Kemper over 3 years ago

Prodigy 190 points

UCD90320 @ PMBus Address 113d Project.xml

+1 yihe over 3 years ago in reply to Ben Kemper

TI__Guru 65610 points

The GPI is considered as fault when it is changed from ASSERTED to DE-ASSERTED.

For this particular case, GPI is configured as ACTIVE HIGH. so when the GPI is changed from HIGH to LOW, it generates fault.

Regards

Yihe

0 Ben Kemper over 3 years ago in reply to yihe

Prodigy 190 points

Hi Yihe,

Thanks for your quick answer.

I find it a bit strange to configure the GPI as active low, because a LOW to HIGH transition on the input should cause a rail shutdown and the input signal is Active HIGH.

But changing the GPI to active low worked for me, thanks.

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UCD90320: GPI signal does not shutdown a rail.