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TUSB7340: Power sequence issue

Patrick Chen
Mastermind 8875 points
Part Number: TUSB7340


Hello

                Has any 3.3V and 1.1V power sequence requirement for these two supply? or It have no power sequence concern. Another question, do we need to stable 3.3V/1.1V then plug into USB device? Or we can plug into USB device before 3.3V/1.1V supply stable and can not cause any access USB device issue. Thank you. 

BR

Patrick

  • 0
    TI__Expert 4325 points

    Patrick,

    As long as GRST# is low, there should be no sequence requirement for 1.1V and 3.3V supplies.   If you plug in a device before PERST# is high and the xHCI driver is loaded, VBUS would not be enabled to the device and there is no access to the device until the power is stable.

    Regards,

    Brian