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Sci.Electronics.Basics -> AC charger for USB devices - what about the data pins
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Author: GeorgeDate: 10:57 06-02-08
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I've ordered a Sandisk Sansa Clip MP3 player, which charges through
the USB connection to the computer. I need a wall wort AC charger
for this device, and possibly for other devices in the future, and
actually have everything I need for that, including a linear 5V, 1
amp, regulated brick supply and a USB type-A socket.
But I don't know what I should do with the data pins - pins 2 and 3.
Should they just be N/C? Should they be tied together, tied high,
tied low? Does it matter?
According to this link:
http://www.usbmadesimple.co.uk/ums_3.htm
an actual upstream USB port (i.e.- the computer) would have these
data lines tied low through 15k resistors.
Does anybody know how these lines are actually handled by a typical
AC USB charger?
Thanks for any suggestions.
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