To charge an iPhone 3G / iPod Touch 2nd gen, usb data- (25) should be at 2.8v, <br /> usb data+(27) should be at 2.0v. This can be done with a few simple resistors: 33k to +5v (23) and 22k to gnd(16) to obtain 2v and 33k to +5v and 47k to gnd to obtain 2.8v. This is a notification to the iphone that it is connected to the external charger and may drain amps from the usb.
I don't know who decided to green light these instructions, but needless to say, they SUCK, at least in my little book. Here is a picture of what I am trying to achieve, hopefully someone can enlighten me on this situation. I posted this same thread/question on my blog here and figured one of the many intelligent people on this forum can help me solve my problem.
There is an error in my picture, and if I read correctly the white wire should be going to pin 27.