Battery powered charging/USB hub

Joe Pfeiffer jjpfeifferjr at comcast.net
Thu May 10 15:34:22 CEST 2007


Frank Coenen writes:
>On 5/10/07, Aloril <aloril at iki.fi> wrote:
>>
>> Small battery-powered USB charger:
>> http://www.ladyada.net/make/mintyboost/
>> I assume above should be able to charge Neo1973?
>
>
>No it won't be able to charge the Neo1973, since it doesn't identify itself
>as a USB2.0 host.
>Hence, the Neo will only draw 100mA. You need the full 500mA from USB2.0 to
>charge.

That doesn't follow -- USB 1.1 allows a device to identify itself as
"high power", and it can then be allowed to draw 5 unit loads (500
mA).




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