iPhone 3G 30-pin pinouts

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Kunio Mitsuma Author

Level 2

165 points

iPhone 3G 30-pin pinouts

Where can I find a diagram that tells me what each of the 30 points does on the iPhone 3G?

MacBook Pro 17-inch (June 2006), Mac OS X (10.5.5), G5 Dual 2GHz Tower (Sept. 2005)

Posted on Sep 26, 2008 12:24 PM

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Answer 1

Kunio Mitsuma Author

Level 2

165 points

Sep 26, 2008 12:52 PM in response to Malcolm Rayfield

Right. I believe that the iPhone 3G does not charge from the FireWire pins.

I am trying to answer the question of why the iPhone 3G displays a complain that it does not work with certain cradles even if the cradles are connected to a Mac via USB. I am wondering the presence of Pins 19 & 20 somehow tells the iPhone 3G that a cradle is trying to charge the phone through Pins 19 & 20 even if no voltage is present at these pins.

Is it the same as saying that, if a cradle is marketed as compatible with the iPhone 3G, the cradle simply *lacks* Pins 19 and 20?

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Answer 2

Sep 30, 2008 8:06 AM in response to Kunio Mitsuma

I'm trying to hunt down info like this too.

My understanding is much like yours Kunio.

The firewire pins are not connected on the 3G - this explains why older chargers/docks don't work.

The iphone will "look at" certain pins of its dock connector to work out if there is compatibility. I think it is looking for certain resistance values between certain pins (or whether certain pins are shorted together - not sure) to see if it is connected to a compatible device. There's some more "clues" here...
http://tinyurl.com/3ocjla

I would like to know exactly how that iphone 3g connecter works as I want to make my own in car charging/hands free/music system. googling does not seem to have the answers. I can't see why this is such a secret.

If anyone knows more info please post!

Message was edited: - typo

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Answer 3

Sep 30, 2008 8:09 AM in response to Thomas O'Carroll

Also this may help...
Pin 1 = Ground
Pin 2 = Audio Ground
Pin 3 = Right Audio
Pin 4 = Left Audio
Pin 11 = Serial Ground

Connect pins 1 and 11 together to stop the audio coming out of the internal iphone speaker.
(use this info at your own risk!)

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Answer 4

e-raw

Level 1

0 points

Jan 7, 2009 8:33 AM in response to Thomas O'Carroll

Hi there!

Thomas, do you have any news about that?
I'm also looking at a cable allowing line-in&out + charger. I've found lots of components possibilities (to make a handmade cable) but no factory crafted cable.
Any help will be great if you find a solution!

(if you want url's of my investigation, feel free to ask! )

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Answer 5

Sep 26, 2008 12:41 PM in response to Kunio Mitsuma

<http://pinouts.ru/Devices/ipod_pinout.shtml>
Note: The FireWire pins are not used by the iPhone 3G

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Answer 6

Kunio Mitsuma Author

Level 2

165 points

Sep 26, 2008 12:42 PM in response to Malcolm Rayfield

Yes, I am aware of the web page you cited.
But, isn't it for the old iPhone 2G because Pins 19 and 20 show FireWire Power?

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Answer 7

Sep 26, 2008 12:45 PM in response to Kunio Mitsuma

The connector is the same, but the new iPhone doesn't use the FireWire pins.

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