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TPS25751: Acting as source and sink in one design

Parker Coons
Prodigy 30 points
Part Number: TPS25751

Tool/software:

We have a design with two power ports, a barrel jack and USB-C. We want the 25751 to act as a 5V source for the USB jack when the barrel jack is connected, and as a 9V sink for the rest of the design when USB-C is connected. What is the mechanism for switching TPS25751 between these two states? I've configured ADCIN1 and ADCIN2 to 'AlwaysEnableSink' and I see that the GPIO have mapped event options like 'barrel_jack_event' and 'enablesource_port1'.

Thank you.

  • 0
    TI__Mastermind 30172 points

    Hi Parker, 

    Thank you for reaching out!

    Could you provide a block diagram of your design along with the different use cases? 

    Best Regards, 

    Aya Khedr

  • 0 in reply to Aya Khedr
    Prodigy 30 points

    TI USB-PD Meeting.pdf

    I've attached a PDF with some diagrams.

  • 0 in reply to Parker Coons
    TI__Mastermind 30172 points

    Hi Parker, 

    Thank you for providing. I will review and get back to you with feedback by Friday. 

    Best Regards, 

    Aya Khedr

  • 0 in reply to Aya Khedr
    Prodigy 30 points

    Any word on this? We really just need to know if there are GPIO mapped events that will force sink or source state (such as enablesource_port1 (73)). I cannot seem to find anything in the datasheets that clarifies this.

  • 0 in reply to Parker Coons
    TI__Mastermind 30172 points

    Hi Parker, 

    The TPS25751 is powered from either VIN3V3 (i.e. when barrel jack is connected in your system) or VBUS (USB-C power adapter or power source). When power is unavailable on VIN3V3 but available on VBUS, it is referred to as the dead-battery start-up condition. In a dead-battery condition, the PD controller will behave as a sink. Once power is available on VIN3V3 (barrel-jack connected), the host would need to clear the dead-battery flag over I2C or use the 'barrel_jack_event' GPIO event. 

    Once the dead-battery flag is cleared, the PD controller can then source if set to do so in the configuration settings. 

    The enablesource_port1 GPIO event is an output event that would get asserted when the PD is behaving as a source. 

    Please let me know if you have additional questions. 

    Best Regards, 

    Aya Khedr