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TPS25730: ENABLE/DISABLE

Allan Fan
Expert 7090 points
Part Number: TPS25730
Other Parts Discussed in Thread: TPS25750,

Tool/software:

Hi expert,

Customer would like to use TPS25750 and with a push button to start VBUS connection to system. Is there any HW pin or FW registers can fulfill the need?  

Thanks,

Allan

  • 0
    TI__Mastermind 37855 points

    Hi Allan,

    Are you looking for help on the TPS25730, or 750?

    Also, can you describe the feature you are looking for in more detail?

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 20 points

    Hi Christopher

    I'm using TPS25730, 

    and product has a return type/recess type power button, which is for triggering power on by sending a low or high pulse.

    So we're checking if there is method to directly trigger TPS25730 to VBUS on/off by sending a low or high pulse with this return type/recess type power button.

    Thanks,

    Duke

  • 0 in reply to Duke Chien
    TI__Mastermind 37855 points

    Hi Duke,

    I'm still not sure if I understand the ask.

    The TPS25730 will always be active in a dead battery configuration, which means that even if there is not board power (3.3V on VIN3V3), the PD controller will take power from VBUS if a Source is connected to the USB-C port.

    The TPS25730 is limited to the GPIOs available, and the only GPIO that comes closest to fitting your needs is the FAULT_IN GPIO.

    This will disable the port when asserted low. If you are in dead battery(powered from VBUS), this will cause the PD controller to lose power when it removes VBUS, and you may see power cycling as the PD breaks the connection, loses VBUS, reconnects, and repeats.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 20 points

    Hi Chris,

    Let me depict my understanding as following, according to your explanation.

    Please check whether I'm right or not, thanks.

    1. When adaptor connected, NO 3.3V input, and Fault_IN pin is open, VBUS will lead to PPHV output

    2. When adaptor connected, NO 3.3V input, and Fault_IN pin is short to GND, PPHV will stop output

  • 0 in reply to Duke Chien
    TI__Mastermind 37855 points

    Hi Duke,

    Unfortunately, I do not think the TPS25730 has the feature you want.

    Duke Chien said:
    1. When adaptor connected, NO 3.3V input, and Fault_IN pin is open, VBUS will lead to PPHV output

    Correct

    Duke Chien said:
    2. When adaptor connected, NO 3.3V input, and Fault_IN pin is short to GND, PPHV will stop output

    Partially correct. What really happens is the PD controller will Hi-Z the CC pins, which manage the PD and type-C power negotiation. This will immediately cause the far end source to disconnect power, and the TPS25730 will lose power (b/c not powered through 3.3V input). Then the TPS25730 will reset due to lost power, and the system will attempt to start a new contract, and repeat the previous behavior.

    Without the VIN3V3 power, there is no stable way to disable the port.

    Thanks and Regards,

    Chris