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TUSB1002: schematic review

Shu-Cheng LIN
Guru 11785 points
Part Number: TUSB1002

Hi Sirs,

Sorry to bother you.

Could you check our schematic again?

Any suggestion are welcome.

Thanks!!

  • 0
    TI__Guru**** 156301 points
    Shu-Cheng

    Please consider switching to TUSB1002A.

    1. What is being connected to U3_USB_SSRX1_N/P?
    2. Where are the AC coupling caps for RX2 and TX2?
    3. May consider change one 0.1uF to 1uF for the 3.3V supply.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Guru 11785 points

    Hi David,

    Please refer our update as below

    1. What is being connected to U3_USB_SSRX1_N/P? 

    We have one carrier board and IO board, the USB 3.1 GEN2 connector on IO board, so I add GEN2 re-driver on my carrier, the carrier board and IO board connected by board to
    board connector, but I have one question, if I add this re-driver on IO board, do you have any suggestion on this case?


    2. Where are the AC coupling caps for RX2 and TX2?

    I add AC coupling caps of RX on conn side, the TX AC coupling caps on IC side, is this OK for this design?


    3. May consider change one 0.1uF to 1uF for the 3.3V supply.

    OK

    4. One more thing need confirm, I saw SLP_S0# (pin 14) should be connected to a GPIO that indicates the system sleep state. If the system SoC does not support this option, then it is recommended to leave this pin unconnected. So we will connected to S4 signal, how about this signal is ok?

  • 0 in reply to Shu-Cheng LIN
    TI__Guru**** 156301 points
    Shu-Cheng

    The placement of TUSB1002 depends on the system loss profile, the host/device transmitter and receiver capability.

    From TX perspective
    If you place TUSB1002 on the carrier board, then loss of board to board connector + IO board loss will not be compensated by TUSB1002.

    If you place TUSB1002 on IO board, then carrier board loss + board to board connector loss will be compensated by TUSB1002.

    RX scenario is opposite of TX scenario. For both TX and RX scenario, the uncompensated loss will have to be compensated by the host/device RX.

    2. The cap placement is fine. I just saw caps for TX2/RX2, and didn't see caps for TX1/RX1, just to make sure the caps are not missing from your design.

    3. It depends the behavior, timing, and voltage level of S4 signal.

    Thanks
    David