30-pin Connector

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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 (-)

External References

Stefan Esser's Info (pg. 13-18)