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Original question:

UCD90160A: UCD90160A Alert configuration issuse.

UCD90160A: How to clear the Faults by CPU

user3660867
Prodigy 230 points
Part Number: UCD90160A

Hi,

We can clear the PMBUS ALERT by Fusion Digital Power Designer now, but can not clear it through PMBUS controlled by CPU.

Even writing the code 0x03 with FF or 00, but the PMBUS ALERT keep low  still. How can we clear the fault through the pmbus controlled by CPU?

Another thing, The PMBUS  lines do not change when we clear the fault by Fusion digital Power Designer.

Thanks.

Fang Youxiang

  • 0
    TI__Guru 65610 points

    Hello

    CLEAR_FAULT(0x3) is a send byte command, it does not have any payload byte. Application shall not send 0xFF or 0x00 along with the command code.

    Could you be more specific about  PMBUS Lines is not changed?

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 230 points

    Hi Yihe

    Thank you for you support.

    The CLK keeps high and DATA keeps low when we use Fusion Digital Power Designer to clear the fault. But PMBUS ALERT can change from low to high. and rail voltages can be updated on Fusion Digital Power Designer at this time.

    Thanks a lot.

  • 0 in reply to user3660867
    TI__Guru 65610 points

    Hello

    There would be a clock stretching after the command was issued. but the CLK and DATA shall be toggled otherwise the alter does not change.

    Do you have the probe trigger, time division for the scope setting?

    Regards

    Yihe 

  • 0 in reply to yihe
    Prodigy 230 points

    Hi Yihe,

    Thank you very much for your strong support. Issues have been resolved.

    After sending the command 0x03 without payload, UCD90160A can receive the command properly and clear Faults.

    And the PMBUS line waves are corrected now, sorry for confusion.

    Fang Youxiang.