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Original question:

TPS65987D: PR_swap is made unintentionally

TPS65987-90EVM: PDO request irregular when we make "External Powered Bit"=1

Maurice
Intellectual 971 points

Part Number: TPS65987-90EVM

Hi, everyone,

Now, I'm validating PDO negotiation when we make "External Powered Bit "=1 intentionally

by using TPS65987D-90EVM,

Related with:

e2e.ti.com/.../2723162

But now, we found someting went wrong with PDO request from EVM,

when we make "External Powered Bit" 1.

Though we attach 45W (..., 20V/ Max. 2.25A) PD adaptor, EVM request 5V / 0.10A only.

It isn't same with our setting :

- Autonegotiate Sink (0x37)

 [4:5] Offer Priority : Choose Highest Power 0x2

Are there any clues about solving this problem?

Thank you.

Best Regards,

  • 0
    TI__Mastermind 36756 points
    Hi Maurice,

    I have not been able to reproduce this failure on my EVM yet. I am always seeing a request for 20V, regardless of externally powered bit being set or not. Could you please send me your .PJT file so I can take a look at your settings?

    Thank you,
    Eric
  • 0 in reply to Eric Beljaars
    Intellectual 971 points
    Hi, Eric-san,


    I'd appreciate for your quick reply & support.

    I sent you private message.
    Please confirm attached file.


    Thank you.


    Best Regards,
  • 0 in reply to Maurice
    TI__Mastermind 36756 points

    Hi Maurice,

    I received your project file, thank you for sharing.
    However, I am still unable to reproduce the issue you are seeing. These are the steps I am taking to try to reproduce:

    1. Load PJT file onto 87-90EVM

    2. Connect barrel jack power supply

    3. Connect PD adapter and negotiate 20V contract

    4. Disconnect PD adapter

    5. Enable "Externally Powered" bit

    6. Connect PD adapter
         - PD controller still negotiates the same 20V contract.

    Can you tell me if I am missing any steps here?

    Thank you,
    Eric

  • 0 in reply to Eric Beljaars
    Intellectual 971 points
    Hi, Eric-san,


    Thank you for your quick reply.


    First, Your procedure is right.

    Secondly, we've noticed our command via I2C is wrong.
    wrong: 29 02 52 44 19 C7
    right: 29 02 52 46 11 C7

    And we've noticed it leads to
    the change 9th bit of "0x29 Port Control Register"
    "SNKIntrusiveMode" from 0 to 1 unintentionally.
    This is because only 5V / 0.10A request is issued.

    I apologize for our fault.


    Thank you.


    Best Regards,