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TPS65982: Confirm about function flow

Satoshi
Guru 19655 points
Part Number: TPS65982


Please let me check about confuse point for TPS65982DA function flow,  procedure steps is below:

I want to know step ④ is correct or not, and the reason of occur step ⑤.

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①When Main board(CPU) shift the state to shutdown, it means that PDC (PD controller) will be set to Sink only by EC.

②No device connect with main board's type-c ports.

③Type-C port CC waveform is attached; CH1 is CC1(Yellow) / CH2 is CC2(Green).

④I think that the CC line need fixed to Rd(Low) when set to sink only.

⑤But from waveform this port declare is DRP, not sink only.

------------------------------------------------------------------

Best regards,

Satoshi

  • 0
    TI__Expert 6430 points
    Hi Satoshi,

    You're correct, the PD controller should only show Rd once configured as PD sink. I think there's some issue with the update from EC.

    Can you share the I2C logs when the EC tries to configure the PD controller as sink?

    Thanks,
    Rahul
  • 0 in reply to Rahul Sharma16
    Guru 19655 points

    Rahul-san

    Thank you for reply,

    I attached I2C log, please see EXCEL file.

    I2C DATA.xlsx

    Sorry for additional question;

    For example, above board with TPS65982D named "Board-1", another board with TPS65982 named "Board-2".

    I find both(Board-1 and Board-2) CC same output toggle(Rp/Rd) when set in Sink only.

    If connect Board-1 and Board-2 to one Dual role type-c device(with AC adapter) and has probability power role recognize fail. 

    Question; Is there any other different factor between Board-1 and Board-2 PDC which leading this issue happened?

    Best regards,

    Satoshi

  • 0 in reply to Satoshi
    TI__Expert 6430 points
    Hi Satoshi,

    I am taking this up offline and hence marking this as resolved here.

    Thanks,
    Rahul