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TPS65987D: Overcurrent Fault Event

Michael Balourdas
Expert 5455 points
Part Number: TPS65987D

Hello,

For overcurrent events, it seems the event name and definition has changed between the August 2018 and Jan. 2021 version of the GPIO Events document, SLVAE11. 

Could you explain the difference?


Are these the same events but renamed and redefined?


Are the event behaviors dependent on the configuration app version?


What qualifies as an “overcurrent event”?

SLVAE11 (Aug 2018)


SLVAE11a ( Jan 2021)

Thanks,

Michael

  • 0
    TI__Mastermind 32911 points

    Michael,

    From my read of the 2018 description, the active state should have been low.  It reports it as a FAUTLZ which is a typical  name for an active low signal.

    The 2021 update is correct for use.

  • 0 in reply to Chuck Branch
    TI__Expert 5455 points

    Hi Chuck,

    Thanks for the reply. One question, what type of overcurrent fault does this bit specifically indicate? The old document implies that it is specific to Source configuration, but the new one is more vague.

    Thanks,

    Michael

  • 0 in reply to Michael Balourdas
    TI__Mastermind 32911 points

    Michael,

    The overcurrent fault can be asserted in 2 ways:

    1.  The sink device draws more current than the PDO specifies, but not so much current that the device heats up and disconnects because of thermail protection.  This is a very rare condition.  What will typically happen is that the resistance of the FET is increased to meet the current limit and with this increase in current, the FET heats up until it trips the over temperature protection which turns the FET off and disconnects the PD.

    2.  A Hard short fault can also cause the over current flag to trip.  If this error occurs, then the PD path is disabled and will not recover until the cable is disconnected.

    Regrads,

    Chuck