Connector pinout: Apple iPod and iPhone (2g, 3g) Dock Interfaces pinout
Used in 3rd and later generation iPods for charging, connecting to a PC via USB or Firewire, to a stereo via line-out, to a serial device (controlled via the Apple Accessory Protocol). This connector exists in most Apple iPod MP3 players (iPod 3G, 4G, 5G Video, 5.5G Video, Nano (1G, 2G, 3G, 4G), Mini, Classic, Touch, Touch 2G, and iPhone (1G, 3G and 3GS))
| pin | name | direction | description | color | | 1 | GND | | Ground (-), internally connected with Pin 2 on iPod motherboard | | | 2 | GND | | Audio & Video ground (-), internally connected with Pin 2 on iPod motherboard | | | 3 | Right | | Line Out - R (+) (Audio output, right channel) | | | 4 | Left | | Line Out - L(+) (Audio output, left channel) | | | 5 | Right In | | Line In - R (+) | | | 6 | Left In | | Line In - L (+) | | | 8 | Video Out | | Composite video output (only when slideshow active on iPod Photo) | | | 9 | S-Video Chrominance output | | for iPod Color, Photo only | | | 10 | S-Video Luminance output | | for iPod Color, Photo only | | | 11 | GND | | Serial GND | | | 12 | Tx | | ipod sending line, Serial TxD | | | 13 | Rx | | ipod receiving line, Serial RxD | | | 14 | RSVD | | Reserved | | | 15 | GND | | Ground (-), internally connected with pin 16 on iPod motherboard | | | 16 | GND | | USB GND (-), internally connected with pin 15 on iPod motherboard | | | 17 | RSVD | | Reserved | | | 18 | 3.3V | | 3.3V Power (+) Stepped up to provide +5 VDC to USB on iPod Camera Connector. If iPod is put to sleep while Camera Connector is present, +5 VDC at this pin slowly drains back to 0 VDC. | | | 19,2 | +12V | | Firewire Power 12 VDC (+) | | | 21 | Accessory Indicator/Serial ena | | Different resistances indicate accessory type:1kOhm - iPod docking station, beeps when connected10kOhm - Takes some iPods into photo import mode68kOhm - makes iPhone 3g send audio through line-out without any messages500kOhm - related to serial communicat | | | 22 | TPA (-) | | FireWire Data TPA (-) | | | 23 | 5 VDC (+) | | USB Power 5 VDC (+) | | | 24 | TPA (+) | | FireWire Data TPA (+) | | | 25 | Data (-) | | USB Data (-) | | | 26 | TPB (-) | | FireWire Data TPB (-) | | | 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 | | | 28 | TPB (+) | | FireWire Data TPB (+) | | | 29,3 | GND | | FireWire Ground (-) | |
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