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LM5066I: Faults

Daniel Gunyan
Prodigy 40 points
Part Number: LM5066I

We are seeing the output of the LM5066I turn off and the resulting diagnostic word is 0x0882. From the table 44 in the datasheet, I interpret this as a CML_FAULT. Next time it happens, I will try reading the CML_STATUS register, but at the moment I don't have that information. My questions are, what could generally cause a CML fault? and would a CML fault cause the output to shut off? There is very little information in the datasheet about CML faults.

  • 0
    TI__Mastermind 39820 points

    Hi Daniel,

    Thanks for reaching out to us. 

    Only CML error won't turn off the device. 

    Please read all these registers to understand which fault causes the device to turn off.

  • 0
    Prodigy 40 points

    Thanks. I wonder if one of the other faults shut off the output and then a CML fault occurred afterward and overwrote the original fault code.

    How long does a set of faults get held in the diagnostic word register before it can be overwritten by another set of faults?

  • 0 in reply to Daniel Gunyan
    TI__Mastermind 39820 points

    Hi Daniel,

    Data in all the status registers won't get cleared unless CLEAR_FAULTS command is sent. 

    The READ_DIAGNOSTIC_WORD PMBus command reports all of the LM5066I faults and warnings in a single read operation. The standard response to the assertion of the SMBA\ signal of issuing multiple read requests to various status registers can be replaced by a single word read to the DIAGNOSTIC_WORD register. READ_DIAGNOSTIC_WORD is latched in at the first assertion of SMBA\ by the LM5066I. It is re-armed with the CLEAR_FAULTS command.

  • 0 in reply to Avishek Pal
    Prodigy 40 points

    There is mention of black box registers. Does the LM5066I actually have non-volatile storage? From what I can see, it doesn't appear to.