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TPS2514 effects of Failures in DP1 and DM1 Pins

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

I am performing a FMEA on the TPS2514 and I am wondering what are the effects of the circuit or users PED when then DP or DM pins:

1. Short to Ground

2. Fail Open.

Also, do the next failure modes make sense, and if they do what would the effects be. This is just for the chip.

3. Output Voltage High

4. Output Voltage Low.

 

  • 0
    TI__Intellectual 2795 points
    Voltage hihg and low exceed the spec claimed in the datasheet would damage this device. Short to ground, has no affection, just trigger TPS2514 into other mode and mode changing cycling. As for the fail open, not sure what's mean?
  • 0 in reply to Milo Zhu
    Prodigy 70 points

    Failing open woud be consist of one of those pins no longer having an output. Some internal failure in the controller would cause this to happen. So I am wondering what would happen if there is an output on DM1 but no output on DP1 because it fails open.

    And what you are saying is if the input voltage is a normal 5VDC, but an internal failure causes the output voltage of the chip to exceed 2.84 VDC or go below 2.57 VDC the device would be damaged?

    If the DP1 or DM1 pins go overvoltage or undervoltage in this manner, would a PED be damaged when plugged in a USB connector?