Power management

Power management forum

State TI Thinks Resolved
Locked Locked
Replies 4 replies
Answers 1 answer
Subscribers 63 subscribers
Views 775 views
Users 0 members are here

Support feedback

Options

Options

Related

UCD90120A: UCD90120A PMBUS_ALERT

Wyatt Huang

Prodigy 30 points

Part Number: UCD90120A
Other Parts Discussed in Thread: UCD90120

Hi,

We use UCD90120 but PMBUS_ALERT will always be pulled LOW, we will use the clear fault button INT will be pulled high, but will be pulled LOW immediately,

our system power has no other exceptions,How to clear other faults clearly by clear fault button , why the PEC Fault cannot be cleared, how can I debug it?

Thanks,
Wyatt

over 6 years ago

0 yihe over 6 years ago

TI__Guru 66120 points

Hello Wyatt

The status bits indicate tht you have some i2c/pmbus communiction. Do your host continously communicate with UCD?

Regards

Yihe

0 Wyatt Huang over 6 years ago in reply to yihe

Prodigy 30 points

Hi Yihe,

Do you mean that other IIC devices communicate with UCD continuously will trigger PMBUS_ALERT pull low?

Thanks,
Wyatt

0 yihe over 6 years ago in reply to Wyatt Huang

TI__Guru 66120 points

Hi Wyatt

There are some vialations on the communcation result in PMBUS_ALERT Low.

For example, the PEC bit means that UCD receive a data package which does not pass the PEC(packect error check).

Regards

Yihe

0 yihe over 6 years ago in reply to yihe

TI__Guru 66120 points

Hello
I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below.
Regards
Yihe