maemo.org - Talk - View Single Post - N900 will not allow USB OTG!

	allnameswereout	2009-10-17 , 22:46
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#446

Originally Posted by daperl

Did you mean "charging" and not "powering?"

"Powering" as in "empowering".

Regardless, this statement is untrue even if I don't understand what you're trying to say. As an example, please read section "6. Accessory Charger Adapter" of "Battery Charging Specification, Revision 1.1." Here's a diagram of an OTG device acting as host while being charged:

Please refer to your source next time you quote from one.

Your example is the only exception I'm aware of.

MicroUSB revision says a USB OTG device may only have 1 MicroUSB connector which must be MicroUSB AB type.

Nokia N900 has MicroUSB type B which may only use EH mode.

If Nokia N900 had MicroUSB type AB it'd not be allowed to be used for charging and host mode using its same port without an accessory such as the one you state. In that case, one might as well carry a Nokia adapter for charging.

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