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TUSB2046B: tusb2046 usb descriptor failed for USB 3.1 device ... but OK for USB 2.0

Chris from Pinterec
Expert 1560 points
Part Number: TUSB2046B

I designed a PCB with the TUSB2046B 4 port Hub.   when I plug in the board into a windows 10 computer I can see the USB hub as windows ca recognize the device.   The issue I have is when I plug in a USB 3.1 Camera.   I am getting a "Descriptor failed" and the device is not recognized by Windows 10.

When I plug in a USB 2.0 Camera into the HUB, windows 10 can recognize the camera and it works well.

I cannot get a USB 3.1  device to work with this IC.   USB 3.1 is suppose to be backwards compatible so windows should be able to recognize the device.  Is there an issue with the IC?   Why cant I see the USB 3.1 Camera?

Thanks

Chris

  • 0
    TI__Guru 60870 points

    Hi Chris,

    Can you send a screen shot of the descriptor failure?  USB 3.1 devices should be backward compatible but not all are.  A common problem is if the device is bus powered and requires 900 mA @ 5V instead of 500 mA @ 5V.  Also, some devices that need more bandwidth may not support  true full speed operation.  

    Regards,

    JMMN

  • 0 in reply to JMMN
    Expert 1560 points

     

    It is a standard Windows Descriptor failure such as the image above.  The thing is....this is a TUSB2046 issue.   When I plug the camera into the computer, windows can recognize the camera.  The computer has the right driver for the USB 3.1 camera.

    It is only when I plug in the TUSB2046 and attached the USB 3.1 Camera to the downstream port of the TUSB2046 do I get this error.

    Thanks,

    Chris

  • 0 in reply to Chris from Pinterec
    TI__Guru 60870 points
    Hi Chris,

    When the USB 3.1 camera is plugged into the computer directly, it is able to access > 1A of current and it is connected at USB 2.0 HS. When the USB 3.1 camera is plugged into the TUSB2046, it's power may be limited and it is connected at USB 2.0 FS. Can you confirm that VBUS doesn't droop on USB camera insertion?

    Regards,
    JMMN