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TUSB216: D+D- Swap pins using

Fabio Gou
Expert 4575 points

Part Number: TUSB216

The customer want to check whether the D+D- could swap pin for use?

This means PCB D+ path is connected with D- pin of TUSB216.

PCB D- path is connected with D+ pin of TUSB216.

  • 0
    TI__Mastermind 22936 points

    Hi Fabio,

    No. You can't mix host and device connections. USB 2 polarity cannot be swapped. The D1x and D2x sides of the device can be swapped with the issue assuming polarity is conserved (DP->DP and DM->DM). TUSB216 DxM pin is connected to DP this function cannot occur and the device features will not be enabled.

    Best,

    Josh

  • 0 in reply to Josh Baik
    TI__Expert 4575 points

    I do not know whether you understand my description.

    It is an active cable project. The reason is that the customer want to save the space of layout.

    I mean: D+1 is the DP of one side, D+2 DP of another side.

    The connection is as below.

    D+1 →D1M→D2M→D+2

    D-1→D1P→D2P→D-2

  • 0 in reply to Fabio Gou
    TI__Mastermind 22936 points

    Hi Fabio,

    I have checked on the bench whether the swipe is feasible.

    You can swap the signals on the TUSB216 as long as the connection between the HOST and Device is correct (DP to DP & DM to DM) as below.

    DP(Host)--------------------D1M---D2M-------------------DP (Device)

    DM(Host)--------------------D1P---D2P-------------------DM (Device)

    Best,

    Josh