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Wednesday, February 16, 2011

Apple iPod, iPhone (2g, 3g), iPad Dock connector pinout




30 pin iPOD proprietary connector layout

30 pin iPOD proprietary connector

at the player ( white side up)


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 Signal Description
1 GND Ground (-), internally connected with Pin 2 on iPod motherboard
2 GND Audio & Video ground (-), internally connected with Pin 1 on iPod
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)

or Component Video Pb

9 S-Video Chrominance output for iPod Color, Photo only

or Component Video Y

10 S-Video Luminance output for iPod Color, Photo only

or Component Video Pr

11 AUDIO_SW If connected to GND the iPhone sends audio signals through pin 3-4,
otherwise it uses onboard speaker. 
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.
19,20 +12V Firewire Power 12 VDC (+)
21 Accessory Indicator/Serial enable Different resistances indicate accessory type:

1kOhm - iPod docking station, beeps when connected

10kOhm - Takes some iPods into photo import mode

6.8 kΩ - Serial
port mode. Pin 11-13 are TTL level. Requires MAX232 chip to convert to
RS232 levels.

68kOhm - makes iPhone 3g send audio through line-out without any messages

500kOhm - related to serial communication / used to enable serial
communications Used in Dension Ice Link Plus car interface

  1MOhm - Belkin auto adaptor, iPod shuts down automatically when power
disconnected Connecting pin 21 to ground with a 1MOhm resistor does stop
the ipod when power (i.e. Firewire-12V) is cut. Looks to be that when this
pin is grounded it closes a switch so that on loss of power the Ipod shuts
off. Dock has the same Resistor.

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
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.

iPod 5G can also be forced to charge by attaching the data + and the data
- pins to the 5v via a 10k Ohm resistor ( BOTH PINS) and connecting pin 16
to the 5v (ground). (Confirmed working with iPod 5G 20GB). This provides
500mA of current for charging. For quicker charing, up to 1A, see below.

To charge an iPhone 3G / iPod Touch 2nd gen or Ipod Classic
(6th Gen)
, usb data- (25) should be at 2.8v, usb data+(27) should
be at 2.0v. This can be done with a few simple resistors: 33k to +5v (23)
and 22k to gnd(16) to obtain 2v and 33k to +5v and 47k to gnd to obtain
2.8v. This is a notification to the iphone that it is connected to the
external charger and may drain amps from the usb.

To charge iPod Nano pins 25 and 27 should be tied
together and then connected to a 10K ohm resistor, and the other side of
this resistors then needs to be connected to 5v power.

It's also possible to charge the iPod's or iPhone's battery to make use
the of internal +3.3v output (18) terminal to connect the USB Data + (27)
thru a 47k ohms resistor and the USB Data- (25) thru a 47k resistor to the
USB Power source +5v (23).  This way the USB function is still useable for
normal operations and makes it easier the fit in a plug. The resistors are
not to critical 2x 150k's still work.

28 TPB (+) FireWire Data TPB (+)
29,30 GND FireWire Ground (-)

Back side of dock connector;
 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29

Pins 1,2 connected on motherboard.

Pins 15,16 connected on motherboard.

Pins 19,20 connected on motherboard.

Pins 29,30 connected on motherboard.

If you disassemble the original apple-ipod-dock-connector-cable and look at
the connector itself, on the back side, where it is soldered, you can see the
number 1 and 30 (e.g. pin 1 and 30). In this description NUMBERING is
INVERSED: pin 1 is pin 30 and pin 29 is pin 2, so, don't look at numbers on

The remote control, iTalk and other serial devices use Apple Accessory
Protocol for communication with iPOD. This protocol was introduced with the
3rd generation iPods, and is also compatible with the 4th generation iPods and
mini iPods. The connections uses a standard 8N1 (one startbit 8 data bits 1
Stopbit) serial protocol, 19200 baud (higher rates up to 57600 also possible,
but speed faster than 38400 may cause problems with large amounts of data),
delay of 12 microseconds inserted between end of the stopbit and the beginning
of the next startbit (also working without this delay).

Electrical: high +3,3V low 0V

default line state: high. Codes used for communication with peripherals
are here

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