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Thread: 763 USB ports: do they ever work?
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Old Oct 7, 2012, 1:45 pm
  #6  
xliioper
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Join Date: Jul 2003
Posts: 23,056
I believe Apple devices may trickle charge off a 500mA USB port if they are in standby mode. Not sure if that is true with the non-intelligent airplane USB ports though. You may need to trick the Apple device with a couple 49.9K and 75K ohm resistors as documented here to present +2.0V on the D+ and D- USB lines.
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