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TUSB2036: Embedded USB hub design not working

Thomas Feldmann
Prodigy 10 points
Part Number: TUSB2036

Hello,

I'm having trouble designing a board with the TUSB2036 and suspect an error in my schematics (attached).

The devices USB hub is central to a larger carrier board connecting a Beaglebone Black Industrial to a SIM7600G-H module.
I'm not powering VBUS because the connected devices are already powered by the carrier board.

dmesg output:

[  117.048547] usb 1-1: new full-speed USB device number 6 using musb-hdrc
[  117.176315] usb 1-1: device descriptor read/64, error -71
[  117.416330] usb 1-1: device descriptor read/64, error -71
[  117.656392] usb 1-1: new full-speed USB device number 7 using musb-hdrc
[  117.784330] usb 1-1: device descriptor read/64, error -71
[  118.024362] usb 1-1: device descriptor read/64, error -71
[  118.136434] usb usb1-port1: attempt power cycle
[  118.580365] usb 1-1: new full-speed USB device number 8 using musb-hdr

Any hints / obvious errors with this design?

Best regards

  • 0
    TI__Guru 60870 points

    HI Thomas,

    A  few things here:

    • The pulldowns on the downstream ports need to be 15K not 10K.
    • The TUSB2036 needs a power on reset, the reset cannot just be connected to power.  You will need to add a RC circuit to create the reset pulse.
    • VBUS is not just power in USB, most devices use it for detection as well, so a downstream device will not turn on its DP / DM pullup until it sees VBUS high.

    Regards,

    JMMN