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TM4C1233H6PZ: USB interface lacks USB_VBUS signal

Dan Workman
Prodigy 20 points
Part Number: TM4C1233H6PZ

The other microcontrollers in this family have a dedicated USB0VBUS pin, but this one does not.  At least, the data sheet doesn’t show one.  This one only has 2 USB signals, USB0M and USB0P.

 

I understand this signal is used as an input and an output when the USB enumerates.  Two questions:

  1. What hardware should I be using to interface the microcontroller to the VBUS pin on the USB connector?

  2. What has to happen to the USB software driver to accommodate this?

  • 0
    TI__Guru*** 135045 points
    Hello Dan,

    VBUS would not be connected to this device. It would have to be a self-powered USB device.

    The TM4C1233H6PZ can only be used as a USB Device. As long as you properly configure it as a USB Device in TivaWare, all configurations will be handled. You cannot configure it as a USB Host or USB OTG - if you try to do this, the driver would not work properly as it would try and operate in a mode the device can't support so you'd get errors etc.