Site menu:

Latest news:

Current Time:

Relevant Links:

Catagory: HARDWARE
Sub Catagory: IPOD
Comment: This website is entirely devoted to getting Linux to run on iPods. They also have hardware information for the connections available on the iPod, which I have used in some of my projects.
DATE ADDED: 2006-11-22
Catagory: HARDWARE
Sub Catagory: IPOD
Comment: The guys at iPodLinux were looking into the comunication used in the dock connector at the bottom of the iPod. Getting hold of the connector proved tricky, but this member has managed it. The site is simple but it serves its purpose which is the sale of many different types of the iPod dock connector.
DATE ADDED: 2006-11-22
Catagory: HARDWARE
Sub Catagory: IPOD
Comment: JAE manufactures various connectors for use in the electronics industry but the main customer is Apple for iPod dock connector. The connector used in the iPod is a proprietary version of the DD1 connector.
DATE ADDED: 2006-11-23
Catagory: HARDWARE
Sub Catagory: IPOD
Comment: I shouldnt have to say much about this site...Apple the makers of the iPod. (and Macs but I shudder at the thought of them!)
DATE ADDED: 2006-11-23

Page Updated:

( 13-Sep-2009 )

Valid CSS! Valid XHTML 1.0 Transitional

iPod Accessory Connector

The Apple iPod has become synonymous with a new generation of upwardly mobile, music loving people. As the iPod was developed new features were added and by the 3rd generation the "dock connector" was provided for accessory connection. The unique feature of the dock connector is the protocols that it supports. Unlike most equipment, the iPod can be connected by USB, Firewire and standard RS232 as accessories require. The connector also gives provides audio in, audio out, video out (for the newer iPod generations) and the power input lines 3.3V, 5V and 12V.

Having said all that, I have to admit that I personal do not have an iPod, so why my interest in the connector? Well, the number of accessories available for the iPod has grown exponentially since the addition of the dock connector. Some of these accessories are useless to someone that does not own an iPod, but some are and to be able to use them, information about the connector is required. (For an example see my Kenwood to computer interface)

Luckily for me, the work in understanding the dock connector has been done by many others. The best documentation I have found is provided at Ipodlinux. Readers should visit the site for full details but in aide of the people looking at my projects or doing their own, some of the more important information is covered here.

IPOD Connector IPOD Connector The connector is made by JAE as part of their 30pin DD1 series. There is four products available: two cradle connectors (one at right angles the other with a 75° tilt), one direct plug and one receptacle. It is the receptacle that is built into the iPod, the accessories using the cradles or the plug (depending on the construction of the device). As with most companies, Apple has bought a proprietary version which means sourcing the correct version is a little more difficult. Luckily Ridax from Ipodlinux has managed to get hold of the correct connector in bulk and now sells it and covers at Ridax iPod Dock Connector sales site.

The pin-out of the connector is as follows: (Items with notes are indicated and connections important for the Kenwood to Computer Interface are in red)

01     Ground (1)

02     Line Out - Ground (1)

03     Line Out - R

04     Line Out - L

05     Line In - R

06     Line In - L


08     Video Out (Composite Video)

09     S-Video Chrominance

10     S-Video Luminance

11     Serial GND

12     Serial TxD

13     Serial RxD


15     Ground (2)

16     USB GND (2)


18     3.3V Power

19     Firewire Power 12V (3)

20     Firewire Power 12V (3)

21     Accessory Indicator (4)

22     Firewire Data TPA-

23     USB Power 5V

24     Firewire Data TPA+

25     USB Data (-)

26     Firewire Data TPB-

27     USB Data (+)

28     Firewire Data TPA+

29     Firewire Ground (5)

30     Firewire Ground (5)

  1. Pins 1 & 2 connected together in iPod
  2. Pins 15 & 16 connected together in iPod
  3. Pins 19 & 20 connected together in iPod
  4. Pin 21 is used by the iPod to determine the accessory being used. 500k is used for serial communication. (See Ipodlinux for more)
  5. Pins 29 & 30 are connected together in iPod

That's about all that can be said about the connector. At the same time as introducing the dock connector, a serial connector built around the headphone socket was also introduced. The RxD and TxD lines are connected in parallel to the lines from the Dock connector. Ipodlinux has information on this if you need it. Once you have got your connection sorted you need to know what protocol to communicate in. USB and firewire are obvious, but the serial connection is explained here.