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HD3SS3212: Application with USB-C

Martin Likavec
Prodigy 180 points

Part Number: HD3SS3212
Other Parts Discussed in Thread: TUSB542

Tool/software:

Hello support team,

I want to use USB7206C (microchip) where UFP port will be USB-C with HD3SS3212 MUX.

I would like to confirm some information's..

1. Will be HD3SS3212 suitable for my application? - 10gbps usb hub, length of usbC cable max 0.5, length of pcb traces about 50mm for UFP port. Or it is necessary to use mux with redriver?

2. According to datasheet typical application - B0 and B1 are connected to the first row of usbC. C0 and C1 is connected to second row of usbC. First row of usbC is assigned to CC1 and second row is assigned to CC2 right? And cable orientation detection also depends on CCx, right?

I need to swap B0, B1 with C0, C1 because of my PCB layout. So, I connect 1row of usbC to C0, C1 and 2row to B0, B1. I can do this, right? Than when I swap it, cable orientation signal for mux will need to be inverted too, right? Because of correct Superspeed pair connected.

3. I am confused if I need to use AC coupling capacitors on both side of MUX HD3SS3212 in my application or not. Could you help me with this? In my first design with USB5744 and TUSB542 I use AC coupling capacitors on both sides.

Thank you

Best regards,

Martin

  • 0
    TI__Guru**** 154730 points

    Hi Martin:

    Martin Likavec said:
    1. Will be HD3SS3212 suitable for my application? - 10gbps usb hub, length of usbC cable max 0.5, length of pcb traces about 50mm for UFP port. Or it is necessary to use mux with redriver?

    This is loss budget for USB3.2 Gen2, 50mm is about 2 in which insertion loss is around 2db for typical FR4 trace, for UFP port, it should handle 8.5db loss.

    For USBC cable, is it standard USBC cable? if yes, 0.5b cable should meet 6db loss.

  • +1 in reply to Brian Zhou
    TI__Guru**** 154730 points
    Martin Likavec said:
    2. According to datasheet typical application - B0 and B1 are connected to the first row of usbC. C0 and C1 is connected to second row of usbC. First row of usbC is assigned to CC1 and second row is assigned to CC2 right? And cable orientation detection also depends on CCx, right?

    yes, cable orientation is depends on CC connection, When a voltage level within the proper threshold is detected on CC1, the DIR pin is high. When a voltage level within the proper threshold is detected on CC2, the DIR is pulled low.

    When you swap between B0/1 and C0/1, DIR will be opposite.

  • 0 in reply to Brian Zhou
    TI__Guru**** 154730 points
    Martin Likavec said:
    I am confused if I need to use AC coupling capacitors on both side of MUX HD3SS3212 in my application or not. Could you help me with this? In my first design with USB5744 and TUSB542 I use AC coupling capacitors on both sides.

    for USB device or redriver, you need to palce AC cap on both sides of redriver or device. but for Mux, it's just path though, you just need to place AC cap on one side of mux if common mode meet mux specification. If can not meet mux common mode spec, AC caps are needed on both sides of mux and a dc bias is needed as well.

    Regards

    brian

  • 0 in reply to Brian Zhou
    Prodigy 180 points

    Hi,

    Yes, the cable is standard usbC cable 0.5m length.

  • 0 in reply to Brian Zhou
    Prodigy 180 points

    Hi

    I have additional question about AC coupling capacitors... Need to confirm if I understand it well.

    I checked the common mode voltage range for HD3SS3212 is 0-2V. 

    I also checked USB7206C Positive voltage on USB 3.2 Gen 2 USB3UP_xxxx and USB3DN_xxxx signal pins, with respect to ground . . . . .1.25 V.

    So, this mean that in my application USB7206C + HD3SS3212 I can use only capacitors on one side because I meet the common mode specification?! (fig7 UFP or fig11?)

    Thank you

    Regards,

    Martin

  • +1 in reply to Martin Likavec
    TI__Guru**** 154730 points

    Hi  Martin:

          your above  statement  about AC cap  is correct .

       so HD3SS3212 should work for this application.

    regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 180 points

    Which figure is better... Fig7 UFP or fig11 for my application? Or capacitors placement depends only on my pcb layout?

    Thank you

    Martin

  • +1 in reply to Martin Likavec
    TI__Guru**** 154730 points

    Figure 7 is better.  

    Regards

    brian