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Original question:

TUSB8041: Difference in power rail capacitors from TUSB8041 manual and eval board user guide

TUSB8041: TUSB8041 schematic review

Samuel Studebaker
Prodigy 110 points
Part Number: TUSB8041

I'm using the TUSB8041 with an upstream USB 3.0 port, two downstream USB 2.0 ports, and one downstream USB 3.0 portusb_vertical_board_new_througholes_newboard.sch. One of the downstream 2.0 ports feeds into a PIC18F2550 on the same board. For our design space is limited, so we have replaced the typical USB connectors with through holes and plan to solder the USB cable wires into them- will this be ok?. I also do not plan on using the chip for power management and was wondering if the schematic looked correct. Any feedback is appreciated.

Thanks,

Sam

  • 0
    Prodigy 110 points

    here's the schematic image if the other file doesn't work.

  • 0 in reply to Samuel Studebaker
    TI__Guru 64326 points
    Samuel,

    I have gone over the image posted and it looks good so far. Looks like you have three USB 3.0 ports and 1 USB 2.0 port (to PIC18F2550) , is this correct? Are you using I2C for this design? Could you share the configuration for the following pins:

    AUTOENz/HS_SUSPEND
    GANGED/SMBA2/HS_UP
    FULLPWRMGMTz/SMBA1/SS_UP
    SMBUSz/SS_SUSPEND

    In order for this design to be fully USB complaint the USB hub must be able to report over current event on downstream ports via OVERCURx pins. Also if you plan to solder the USB cable wires then it is best practice to mark these ports as a non removable port via rmbl[3:0] bits. This can be done via I2C, SMBus or OTP.
  • 0 in reply to Malik Barton57
    Prodigy 110 points
    Downstream port 3 has the USB 3.0 pins labelled but it's only being used for USB 2.0 so two USB 3.0 ports and two USB 2.0 ports. I also wanted to ask if it is ok to leave the USB 2.0 differential pair unconnected to the hub if the port will only be used for USB 3.0 communication and vice versa for USB 2.0 only communication.
    We are not using I2C and I have left those pins unconnected because we weren't planning on using the hub for power management.
  • 0 in reply to Samuel Studebaker
    TI__Guru 64326 points
    Samuel,

    For the USB 2.0 ports this is okay to leave the USB 3.0 lines unconnected, however for the USB 3.0 ports the USB 2.0 lines are needed in cases devices need to use HS signaling. I would ensure that the the pins you do not plan on using have the appropriate internal pull up and pull downs for your desired settings.