Thread: just pulled the trigger on a pocket pro
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Old 12-02-2009, 07:31 PM   #64
Dave_S
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Posts: 1,325
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Join Date: Jan 2009
Location: Bavaria Germany
Device: Sony Experia Z Ultra
Quote:
Originally Posted by LoganK View Post
As for mains, the Pocket Pro, as I understand it, only uses the USB port for power. There is no standard way to draw power in this manner other than to connect as a USB device and negotiate with the computer. If the software is broken, then this negotiation cannot take place and the device cannot charge.
It seems that you just described a Catch-22 situation for devices that are solely powered by USB, like keyboards and mice? While negotiation with the computer for power requirements is possible, with no negotiation the device will receive the default full power of 500 ma. whether it actually draws that much or not. That is how USB powered lights and fans receive power from a USB port with no microcontroller involved at all.
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