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30-pin Connector
This is the "old" connector to connect the iOS devices to your computer's USB port, to charge the battery or to connect speakers or similar devices. For the "new" connector, see Lightning Connector.
Pin connections
| Pin | Signal | Description |
|---|---|---|
| 1 | GND | Ground (-), internally connected with Pin 2 on iPod motherboard |
| 2 | GND | Audio and 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 (+) |
| 7 | ? | ? |
| 8 | Video Out | Composite video output (only when the slideshow mode is 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 | n/a | not used |
| 15 | GND | Ground (-), internally connected with pin 16 on iPod motherboard |
| 16 | GND | USB GND (-), internally connected with pin 15 on iPod motherboard |
| 17 | n/a | not used |
| 18 | 3.3V | 3.3V Power (+) |
| 19 | +12V | Firewire Power 12VDC (+) |
| 20 | +12V | Firewire Power 12VDC (+) |
| 21 | Accessory Indicator / Serial enable | Different resistances indicate accessory type |
| 22 | TPA (-) | FireWire TPA (-) |
| 23 | 5 VDC (+) | USB Power 5 VDC (+) |
| 24 | TPA (+) | FireWire TPA (+) |
| 25 | Data (-) | USB Data (-) |
| 26 | TPB (-) | FireWire Data TPB (-) |
| 27 | Data (+) | USB Data (+) |
| 28 | TPB (+) | FireWire Data TPB (+) |
| 29 | GND | FireWire Ground (-) |
| 30 | GND | FireWire Ground (-) |
