power plug

Sergio Bessa sergio.bessa at ideavity.com
Sat Jan 20 18:50:49 CET 2007

Andreas Kostyrka wrote:
> * Nikita V. Youshchenko <yoush at debian.org> [070120 13:19]:
>>>> 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.
>>> Well, I'm almost certain that my USB mouse has no battery builtin, so
>>> I guess USB does provide some minimal power to enable configuration.
>> Sure.
>> That depends on how usb client hardware is done.
>> In your mouse, there is microcontroller that controls usb client
>> functionality, and powers itself from usb (yes usb gives some limited
>> power - up to 100 mA if I remember correctly - even to client which is not
>> configured yet.
>> But in case when USB is controlled by Linux USB Gadget driver, central CPU
>> must be operational and kernel up and running for USB client functionality
>> to work.
> That depends upon how clever the USB port hardware is, I'd guess.
>> Soft is Linux kernel in my case.
>> And yes, it can't charge over usb until it is up.
> I know, I've owned an iPaq with GPE once with that characteristic too ;)
My Motorola V3 had the same problem... I could not let it 'die' or I 
would need to use the power outlet adapter to charge it :S
It was a very annoying feature, speccially while traveling... it's a lot 
easier to carry a mini usb cable than the adapter and the cable can be 
used for many other things, from web cams to IP phones etc...

Sergio Bessa
> Andreas
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