TPS25751: How should the insertion status of USB cable change after disabling PD

Part Number: TPS25751

Tool/software:

Hi teams:

Our different testers discovered two different phenomena during the testing process:
① After disabling PD, the status of the USB cable will change from an inserted state to an unplugged state, and only after enabling PD will the status of the USB cable change to an inserted state
② After disabling PD, the status of the USB cable changes from an inserted state to an unplugged state, and then to an inserted state again
May I ask which of the above two situations is considered a normal phenomenon?

(Prerequisite: In disabled PD, the phone and our board are connected through USB-C)

Best Regards!

Iris

  • Hi Iris, 

    What is TPS25751 power (source/sink) and data (DFP/UFP) role prior to disabling PD and what is the reason for setting this bit? 

    Modifying any fields in register Port Configuration (0x28) will cause a temporary port disconnect and reconnect for the new settings to be initialized. 

    Thanks and Regards,

    Raymond Lin