maemo.org - Talk - View Single Post - Solution: N900 Charging from dumb power sources *UPDATED*

Master of Gizmo	2010-01-05 , 15:27
Posts: 345 \| Thanked: 467 times \| Joined on Nov 2007 @ Germany	#64

Originally Posted by jabawok

I charger), the spec says that the data pins (D+, D-) should be shorted - indicating to the phone that it can draw as much power as it needs (up to 1A?)

As i've already written in another thread: The spec does not say to shorten them. Instead the spec says that you are supposed to connect them via 200 ohms. The n900 may work fine when shortening them, but shortening something always means that some significant power may flow over this short circuit. Using 200ohms instead is safe for any hardware as the current over the resistor is limited to 3.3V/200Ohms = 17mA.

These resistors cost nothing and may protect that hardware, so they are really a good investment.

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