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Original question:

TUSB320: Switch from UFP to DFP Mode without loosing USB connection

TPS65983B: Power Role Swap without a reconnection of USB communication

martin jaeger
Prodigy 110 points
Part Number: TPS65983B
Other Parts Discussed in Thread: TPS65987D, , TPS65987

In our Project we want to connect a mobile phone to a external GNSS Receiver over a USB C-Type connection. The System is powered thru the Vehicle Power supply of a car. In this situation the mobile phone is the sink and a continius communicatin to the GNSS Receiver is applied. In some situations the car supply is interupted and the mobile phone will be the surce for the attached GNSS Receiver. Question is: Is it possible to have a Power Role Swap (Fast Role Swap) without initiate a reconnection to the GNSS Receiver? The USB Connection have to be uninterupted during the Power Role Swap. 

  • 0
    TI__Expert 4455 points

    HI Martin,

    Yes, the USB PD link is maintained during a successful Fast Role Swap. After the FRS, power roles will be reversed and port partners are free to negotiate for more power. One reference is section 8.3.2.6 Fast Role Swap in USB Power Delivery Specification Revision 3.0, Version 1.2

    I notice this question is titled with TPS65983B. Are you considering an Intel Thunderbolt design? The '83B is specifically for Thunderbolt reference designs. Have you considered TPS65987D, a single port PD controller with FRS support?

    Regards,

    Scott

  • 0 in reply to Scott T
    Prodigy 110 points
    Hi Scott, Thank you for Information.

    It is not a Thunderbolt design, I think the TPS65987 is enough for our application. Can you suggest a Evaluation Board to check the function together with our mobile phone and the GNSS Receiver?

    Best regards Martin
  • 0 in reply to martin jaeger
    TI__Expert 4455 points

    Hi Martin,

    I suggest the TPS65987EVM. I think you will need access to USB host and/or device ports depending on your existing components. These can be added with the 10G Expansion EVM.

    The 10G Expansion provides a Type-A and Type-B USB connection.

    Regards,
    Scott