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TPS2514 failures with the DP1 and DM1 pins

David Poehlman
Prodigy 70 points
Other Parts Discussed in Thread: TPS2514, STRIKE

I am wondering what are the failure effects if there was an issue with the pins for the TPS2514 Dedicated USB Controller. More specifically what happens with DP1 and DM1 when there is an issue. The issues I am looking at is if these pins short to ground or if there is an open. I could not find these situations in the equipment spec. I am thinking if there is an open on one of those pins a USB Personal Electronic Device would not be charged. I just wanted some verification.

  • 0
    TI__Mastermind 42795 points

    The fail-mode possibilities vary greatly depending on the energy level of the source inflicting the damage. For example, if the source was a mild ESD strike, then the pin could exhibit a small amount of leakage (100-200uA) current and not be readily detected (silent type of failure).

    Severe stress can cause the pin to short out in a high leakage condition. If the severe stress persists, then the bond wire connecting pin to die could open. In general, even the "mild ESD" condition can cause the system to behave erratically.

  • 0 in reply to Eric Wright
    Prodigy 70 points

    Maybe I am not understanding your answer enough. If these DP1 or DM1 opened would a PED no longer charge through the USB connector? If there was a short to ground condition through these pins with a high energy level would a PED be damaged through leakage current?

  • 0 in reply to David Poehlman
    TI__Mastermind 42795 points
    Generally speaking, the "smart PED" tries to query the USB port for power capacity through the DP and DM signal lines. If those are open or shorted, then the query fails and the PED may not try to charge at all. Or the PED may just charge minimally (<500mA) at some default level.
    Shorting the PED DP and/or DM to GND should not cause any damage to the PED, but only the PED MFGR will know for sure.
  • 0 in reply to Eric Wright
    Prodigy 70 points

    Just to make sure because I had a different idea of what would happen. I am performing a FMEA and I wanted to know the failure modes if those pins short or open.

    What this is saying is if any of the pins 1. short to ground:

    No damage to PED and PED will not charge.

    2. Any of the two pins go Open:

    No damage to PED and PED will not charge.