>> Can I disable VBUS while keeping the rest of USB functional for a
>> device that does not require bus power?
>
> unfortunately not, your device would see a disconnection. The reason is
> that even though you don't really put any load on the bus, the PHY still
> samples VBUS levels to know when the session is valid (VBUS > 4.4V).


Darn.  My goals are to minimize power usage and the amount of
electrical noise traveling to my USB device so I was hoping to
eliminate the otherwise unused VBUS.  Any creative ways to pull this
off?

- Grant
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