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TUSB2036 Not working (/PWRON# always high)

Arend Wierks
Prodigy 30 points
Other Parts Discussed in Thread: TPS2042, TUSB2036

Hello,

I have a problem with the TUSB2036 in combination with the TPS2042. My upstream device is a 'PICO-IMX6-EMMC' system on module.

I've connected it much like the schematic in '6Mhz Bus-powered 2-port hub.pdf' from the reference schematic.

But when i power on the PICO my usb devices won't work. I don't measure 5 volt on the out1 and out2 pins of the TPS2042 and the /EN1 and /EN2 pins are always high. However, the suspend pin on TUSB2036 is low.

Is there something wrong with my schematic? I've included it.

Hope you can help, thanks in advance.

ArendUSB Schematic.pdf

  • 0
    TI__Mastermind 18655 points

    Hello Arend,

    Are the OVRCUR terminals enabled (low) ?

    At the process of enumeration, a USB device will send its configuration descriptors to indicate the amount of power required. When a high-current device is connected to a bus-power hub, the host will not configure it. You can verify this by changiong the BUSPWR pin to high.

    In your schmenatics, are USB_VBUS and 5V connected to the same net?

    Regards

  • 0 in reply to Joel Jimenez0
    Prodigy 30 points

    Hello Joel,

    Thanks for your answer.

    I have a very strange signal on the OVRCUR terminals. When I measure it with a scope I see a signal of about 10 Hz where it is high 90% of the time and low the other 10%. Even when no usb device is plugged into the downstream connectors.

    The signals USB_VBUS and 5V are indeed connected to the same net.

    Best regards.

  • 0 in reply to Arend Wierks
    TI__Mastermind 18655 points
    Hello Arend,

    Is Vcc voltage always stable (3.3v)?

    Additionally, confirm that the oscillator is 100% stable .

    Regards.
  • 0 in reply to Joel Jimenez0
    Prodigy 30 points

    Hey Joel,

    Yes the voltage on pin 3 and 25 are stable, the oscillator is also stable.

    Regards