power plug

Joe Pfeiffer jjpfeifferjr at comcast.net
Sat Jan 20 19:06:33 CET 2007

Nikita V. Youshchenko writes:
>> The phone is charged via USB. I am assuming it comes without a power
>> supply. You can get a USB charger for a power outlet on ebay for a few
>> bucks if you want to charge it without a PC.
>How can it charge over USB if it gets full discharged?
>AFAIK, USB device is not powered by USB host until it is configured.
>So gadged must be operational to charge over usb.

No...  in fact, bus-powered deviced can't configure themselves until
after they see power.

>BTW, this is the exact behaviour I'm observing with my old ipaq running
>Familiar Linux: it could be charged via USB while it it operational, but if
>it gets full discharged, USB can't help and power choord has to be used.

That must be something in the charging circuit in the iPaq.

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