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TPS25730: About Request Messages

Ryu Yamashita
Genius 3665 points
Part Number: TPS25730

Hi team,

The TPS25730 will return a Request message in response to a Source Capabilities message from a Source device such as a USB-C AC Adapter.
What is the setting of the "USB Communication Capable" flag in the Request message? What is the setting of the "USB Communication Capable" flag in the Request message?
(Can it be set externally or is it a fixed setting? If fixed, what is the setting?)

Sincerely,
Ryu.

  • 0
    TI__Mastermind 37855 points

    Hi Ryu, 

    Let me check with the team and I'll get back to you later in the week.

    My assumption is that it would be disabled, as the device is meant to be a power only device acting like a barrel jack replacement. Configurable settings should be described in the datasheet or TRM. I do not see it there, so it is likely fixed.

    Thanks and Regards,
    Chris

  • +1 in reply to Christopher Lim1
    TI__Mastermind 37855 points

    Hi Ryu,

    I was able to confirm with the team that the USB Communication Capable flag in the Request message is set to "0", and is fixed.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Genius 3665 points

    Hi Chris,

    Thanks for the reply.
    If Flag = 0 fixed, it seems that TPS25730 cannot be used for USB-C Port for data communication, but can TPS25730 be used for USB-C Port for data communication?

    Sincerely,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Mastermind 37855 points

    Hi Ryu,

    Not 100% sure what you are asking here, but I can provide some general responses.

    The TPS25730 does not interact with the data on the DP/DN or SS lines, so any USB communication there can occur somewhat outside the scope of the PD controller.

    One issue that may occur is that the source side PD controller may interpret the USB Communication Capable flag in the Request message as 0 and not attempt to enumerate USB on the port. This would prevent USB data communication.

    Thanks and Regards,

    Chris