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USB device with 3.3V VBUS for AM335X USB0

louieliu
Prodigy 20 points

HI,

My design is using USB0 as usb device. However, only DP & DM are provided on connector due to system limitation. Is that ok to feed VBUS with internal 3.3V on board? 

thanks,

Louie

  • 0
    Intellectual 625 points

    Hi Louie,

    May be you are using self powered USB & VBUS signal from external host can be used to detect whether host is connected or not. Could you please share snapshot os schematic & what you are intending to implement?

    Regards,

    Vinayak

  • 0 in reply to vinayak13
    TI__Guru**** 393215 points

    No, USBx_VBUS pin must be supplied from a 5V source. Configuration depends on USB mode:

    Host: AM335X pin USBx_DRVVBUS drives a power switch to provide VBUS voltage to the USB connector. This VBUS voltage must be sensed by USBx_VBUS.

    Device: VBUS voltage comes from the USB connector. This VBUS voltage must be sensed by USBx_VBUS.

    In all cases VBUS must be >= 4.4V to start a session.