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TPS2543: TPS2543 (Plug in the keyboard on the USB charge port, then insert the adapter, and the keyboard light will turn on for a moment.)

Eason Yuan
Intellectual 840 points
Part Number: TPS2543

Dear all,

I met issue in using TPS2543 in recent project.

Question description:

Plug in the keyboard on the USB charge port, then insert the adapter, and the keyboard light will turn on for a moment.

We measured the fail waveform and found no other exceptions. It is inferred whether the IC will initialize the device inside.

Could you please give us comments on it? Thanks!

  • 0
    TI__Mastermind 26430 points
    Based on the figure that you have shown, the power negotiation is correct and the bus is enumerated and then the controller does not hold the bus properly in JK mode. This causes the TPS2543 to renegotiate the power bus and then the function device re-enumerates and then works going forward.

    This looks like the TPS2543 is performing as expected.