IPhone 3G Charging Specifications

Hello,
can anybody give me please the specifications for iPhone 3G charging via USB ?
I want to know how much mA and how much voltage must be applied to the USB Pins 1 to 4 (data data and two for +-) to let the iPhone 3G start the charging mode!
Thanks;)
Message was edited by: V3r0x

thanks but whats the difference between pin 1 and pin 11
23 5 VDC
25 Data USB Data
27 Data USB Data Pins 25 and 27 may be used in different manner. To force the iPod 5G to charge in any case, when 'USB Power 5 VDC' (pin 23) is fed, 25 must be connected to 5V through a 10KOhm resistor, and 27 must be connected to the Ground (for example: pin 1) with a 10KOhm resistor.
11 Serial GND
1 GND Ground
i think with my +- data , data usb cable i have to use pins 25,27,23 and 1 ?
especially on iphone 3G @ 5V and 500 mA ....
i am right ?

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