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Old 01-07-2012, 04:28 PM   #1
mjfairman
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Default what is the mini USB spec required to charge BB

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I have wired a single mini-USB onto my motorcycle to provide power to any one of several devices including a garmin, my mp3 player, and I'd like to use it to charge my old BB. currently i have only connected the power and ground wires to the mini-USB cord.

i read someplace that BBs will not stay in charging mode if there is no "signal" on the other two data wires. i have found that to be true and unfortunately, i cannot find that post.

i'd like to build a circuit to supply the needed voltage to the data wires such that my BB will charge. does anybody know what is required?
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Old 01-07-2012, 10:32 PM   #2
mjfairman
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Default Re: what is the mini USB spec required to charge BB

i have found some guidance on other forums suggesting that simply "shorting" the #2 and #3 data wires together with #1 and #4 wired to power and ground may do the trick.

can anybody confirm this should be expected to work?
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Old 03-15-2012, 09:10 AM   #3
mjfairman
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Default Re: what is the mini USB spec required to charge BB

this did not work. bb phone still will not charge off this wired power connection. it starts to, then stops. other mini-usb devices such as mp3 player charge off this connection just fine. i remember reading of a simple circuit described as required to make this charging connection work. can anyone point me in the right direction?
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Old 03-15-2012, 02:51 PM   #4
bostonnerd
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Default Re: what is the mini USB spec required to charge BB

Quote:
Originally Posted by mjfairman View Post
this did not work. bb phone still will not charge off this wired power connection. it starts to, then stops. other mini-usb devices such as mp3 player charge off this connection just fine. i remember reading of a simple circuit described as required to make this charging connection work. can anyone point me in the right direction?
This may help. Go to an AT&T store and pick up one of their charging only mini USB cables. You should be able to check the pin-outs from that.
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Old 03-17-2012, 05:31 PM   #5
kingnba6
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Default Re: what is the mini USB spec required to charge BB

i did the same thing on my bike. all you need to do is wire the two data cables together. it works fine.
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