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TPS2546: Unexpected behavior from STATUS pin

Antony Lin
Genius 13480 points

Hi,

We found an unexpected behavior of STATUS pin after the system enter S4/S5 mode as summarized below.  Please provide your comments.  Thanks!

  • Please see the bottom for the schematics.  STATUS is only pulled up to 3.3V through 100kohm and then to a EC input as a notification purpose.
  • The issue happened when system is in S4/S5 (CTL1/CTL2/CTL3/ILIM_SEL= 0011) mode with nothing connected to this USB type-A port.
  • Since nothing is connected to this port, we would expect STATUS be driven high under S4/S5 mode.  The issue can be seen at Waveform1 as below that STATUS is stuck @ ~0.7V for unknown reason.

Waveform1: CH1/2/3/4=CTL1/CTL2/ILIM_SEL/STATUS

Waveform2: CH1/2/3/4=CTL1/CTL2/ILIM_SEL/CTL3

  • 0
    TI__Mastermind 30000 points
    Hi Antony,

    Thanks for posting your question here on E2E. I was able to replicate the issue you are seeing on the TPS2546EVM. With the configuration that you stated (CTL1/CTL2/CTL3/ILIM_SEL= 0011) the status pin is low for about 5-10 seconds and then goes back high, even when there is no load attached. I have not seen this before, nor do I have an answer. These parts were transferred to our team, so I am emailing one of the engineers who has supported these parts much longer than I have to see if he has seen something like this before. In the mean time, I'll keep looking through the datasheet to see if this is possibly a known issue or use case.
  • 0 in reply to Adam Mc Gaffin
    TI__Genius 13480 points

    Issue solved due to soldering problem.

    Thanks!

    Antony