Charge iPad while USB in use?

[iPad_88]

Hey people,

I wonder if there is a solution for this common problem.
I want to use my iPad with an external audio interface which is connected with the CCK and a standard USB A -> USB B. Of course the iPad will not charge through the CCK.
I want to know, if there is a "hack" for that. I know, that this is possible on a few products for example Alesis iO Dock, Apogee Interfaces, iConnectivity MIDI2+ / 4+.
So, how to achieve this?

As far as I know the iPad needs to see the right voltages on D+ and D- to "allow" loading from +5V and GND. But I assume that D+ and D- are blocked by the used interface.

Any suggestions?

Thanks,
Chris

 

[twerppoet]

You cold try a lighting to 30 pin adaptor and then one of the 30 pin charging/data/audio cables and see if that works. It might, since I can use that adaptor to charge and listen to my iPhone on a speaker dock.

Similar to this: http://www.cablejive.com/products/dockBoss5.html

I couldn't find exactly what I think you need.