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HD3SS3212: Could the USB device be connected to A pins?

Janne Ahonen
Prodigy 20 points
Part Number: HD3SS3212
Other Parts Discussed in Thread: TUSB1064, HD3SS6126

Hello,

does HD3SS3212 work properly if the USB device is connected to A pins, and host is connected to either B or C port? Purpose is to use HD3SS3212 as a on/off-switch for the USB port. I guess that there would be no problems as the HD3SS3212 is just a passive switch, but it would be nice if someone could verify this.

Regards,
Janne

  • 0
    TI__Guru**** 177676 points
    Janne

    Instead HD3SS3212, I would actually recommend TUSB1064 without using the DP function.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Prodigy 20 points

    TUSB1064 seems a bit complex for such a simple device what I am looking for. It is for security isolation of USB port, rather than muxing between two data pins.

    Do you have suggestions what to use if I want also to switch USB 2.0 pins (D+/D-) in addition of the SS pins? I have found HD3SS6126 but that is only available in commercial temperature range, while I could possibly manage with that, industrial temperature range would give some more margin.

    Regards,
    Janne

  • 0 in reply to Janne Ahonen
    TI__Guru**** 177676 points

    Janne

    With HD3SS3212, if you have USB receptacle on both port A, B, and C, then you can have max 3m USB3.0 cable on port A, and max 3m USB3.0 cable on Port B or C, resulting in a total 6m USB3.0 cable, which is a violation of the USB3.0 spec and most host/device will not work across 6m cable. So having TUSB1064, which is a redriver, would extend the cable length.

    If you do want to use HD3SS3212, then you need to have USB plug on one side, and USB receptacle on the other side so the cable length is restricted to 3m. HD3SS3212 board design also needs to be done to minimize the amount of insertion loss. 

    Thanks

    David