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TPS53688: communication error

Hailiang Zhang
Genius 11440 points
Part Number: TPS53688


Hi Team,

My customer report a following failure happened when TPS53688 visited through PMBUS: 0x7e/0x7f

According to DS, communication error / device was first to assert SMB ALERT#. 

Can you share more details on how the fault triggered? And the effect on DC to DC?

Fault Info:

Regards，
Hailiang

  • 0
    TI__Guru 66840 points

    Hi

    First please understand the various statuses and how to map each.

    Status_word return 0x0202 it means that bit 1 and bit 9 are set.

    you can ignore bit 9 since bit 2 is the reason why bit 9 set.

    Next step is that  you have to read CML_STATUS. but typically it means that there are I2C/pmbus  communications: such as invalid command, invalid protocol and invalid data.

    All these status(CML) do not cause issues since controller already detect and ignore those commands.

  • 0 in reply to yihe
    TI__Genius 11440 points

    Hi Yihe，

    The customer will occasionally encounter a "failed" after accessing the device many times. In order to prevent missing important commands, the error 0x0202 should not be ignored. How to deal with this "failed"?

    Regarding this issue, what debugging suggestions do you have?

  • 0 in reply to Hailiang Zhang
    TI__Guru 66840 points

    Hi

    Yes, if there is a invalid command or data, host will receive  NACK this is how the communication work.

    They have to check the waveform to ensure that the signals are good without noise coupled. ALso ensure the host does not send out wrong command.

    Regards

    Yihe