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TPS53681: how to read each phase current by PMBus

Mason Liu
Expert 4035 points
Part Number: TPS53681

Hi,

We met a "Current sharing fault", I would like to know how to read current value of each phase by PMBUS command? 

Thanks.

BR

Mason

  • 0
    TI__Genius 11095 points

    The current share warning is very fast compared to telemetry, so it may not be helpful to read the phase currents. I would suggest to capture waveforms of the CSP pins and trigger on the SMBALERT pin for current share fault. 

    You can read the phase current of each phase using the PHASE and READ_IOUT PMBus commands. 

    Refer to the TRM document here. 

    Write the PAGE to 0x00 or 0x01 for Rail 1, Rail 2

    Write the PHASE to 0x00

    Read the READ_IOUT value to get phase 1 current

    Write the PHASE to 0x01

    Read the READ_IOUT value to get phase 2 current

    etc... 

    https://www.ti.com/lit/ug/sluubo4/sluubo4.pdf