On 10 January 2015 at 15:20, Bob Blick <bobblick@ftml.net> wrote:

> ...
>
>
Everything Else(TM)* goes like
> this:
> 1.0 Amp charging - tie both data lines together and to nothing else.
> 0.5 Amp charging - each data line gets its own 15K resistor to ground.
>
>
> ** for most values of Everything*


Indeed.

There are definitely some other funnies

but most SHOULD follow the now formal "USB" spec.
Most people comply - its the elite/specialist [tm again?] manufacturers
that can be different.
(BRain suggest Blackberry may be different but not guaranteed)

Prior to formal spec for "5V USB" charging:

The old Ericson chargers has a semi-complex voltage-current-time mapping
that allowed low energy chargers to be identified and loaded appropriately.

Some Motorola phones (LASR?) using both mini-USB and micro-USB had a
resistor on an extra charger pin that had to be there for them to charge.



               Russell
--=20
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