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TPS25810 + HD3SS3212 / Figure 15. Example Implementation

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: TPS25810, TS3USB221, HD3SS3212, TUSB320EVM, TUSB320

Hi Team,

The following figure is example implementation in TPS25810 datasheet (page 18).
It shows Dp / Dm are direct connection between USB type-C connector and USB host.



Is there no need to put switch IC like TS3USB221 for USB2.0 (Dp / Dm) signal?
My customer concern that USB2.0 signal is established before USB3.1 that is connected via HD3SS3212, then application operates USB2.0 only.

I believe switch IC isn't required as Figure 15 shows, but would like to confirm just in case.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 36085 points

    Hello Yaita-san,


        There is no need for a switch on the HS lines, since the DP/DM lines are connected to both ports on the Type-C connector and the switching is made mechanically due to the pin assignment.  You can review the TUSB320EVM and notice that there is no switch on this Type-C High speed implementation.

    TUSB320 EVM:

    Regards,

    Diego.

  • 0
    TI__Intellectual 1990 points
    Yaita-san, FYI the SSTX and SSTX connections shown above are swapped. We are making changes to the datasheet to make corrections. B0 connects to SS TX2, C0 connects to SSTX1, B1 connects to SSRX2, and C1 connects to SSRX1. Please also note that AC coupling caps must be placed between the mux and USB C connector.

    As to your question, shorting DP1 and DP2, DM1 and DM2 are allowed by USB Type-C(TM) specification.