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#350304 - 19/02/2012 15:56 Re: iPhone USB charging - charger output capacities and signalling [Re: K447]
K447
addict

Registered: 29/05/2002
Posts: 696
Loc: Toronto, Ontario, Canada
For completeness and future reference, I should include this link to the Battery Charging v1.2 Spec and Adopters Agreement, USB Implementers Forum

From the USB 2.0 Wikipedia entry for USB 3.0;
Quote:
Several changes and increasing limits including allowing 1.5A on charging ports for unconfigured devices, allowing High Speed communication while having a current up to 1.5A and allowing a maximum current of 5A.

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#353705 - 01/08/2012 21:25 Re: iPhone USB charging - charger output capacities and signalling [Re: altman]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14002
Loc: Canada
The 1-amp rated Samsung AC charger supplied with my Galaxy Nexus has pins D- and D+ shorted.

The cheap china car charger I got from DX has proper resistor networks to signal 500mA max per port (2 USB ports). I just now hacked it, adding 200ohms across D- D+, to trick my phone into charging at (up to) 1amp from it, instead of trickle charging as it normally would.

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#353715 - 02/08/2012 13:01 Re: iPhone USB charging - charger output capacities and signalling [Re: mlord]
Folsom
member

Registered: 12/08/2001
Posts: 175
Loc: Atlanta
A friend of mine makes a cable that can switch in and out the short between the data lines. This is nice so I don't have to modify any chargers. Dealextreme makes cheap versions of his cable, but he says those are junk.

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#353908 - 08/08/2012 17:07 Re: iPhone USB charging - charger output capacities and signalling [Re: Folsom]
Daria
carpal tunnel

Registered: 24/01/2002
Posts: 3932
Loc: Providence, RI
I took a USB extension cable and modified it, then just swapped that in and out as needed. Same idea.

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