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Wednesday, February 16, 2011

Apple iPhone (1G, 3G, 3GS, 4) Dock connector pinout

 

 

30 pin iPOD proprietary connector layout


30 pin iPOD proprietary connector


at the iPhone cellphone ( white side up)

Used in iPhone (1G, 3G and 3GS) 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
also 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)

 


Pin Signal Description
1 GND Ground (-), internally connected with Pin 2 on iPhone motherboard
2 GND Audio & Video ground (-), internally connected with Pin 1 on iPod
motherboard
3 Right Line Out - R (+) (Audio output, right channel) . See also

Apple iPhone headset  connector pinout
4 Left Line Out - L(+) (Audio output, left channel)
5 Right In Line In - R (+)
6 Left In Line In - L (+)
8

 
 
9

 
 
10

 
 
11 GND If connected to GND the iPhone sends audio signals through pin 3-4,
otherwise it uses onboard speaker.
12 Tx iPhone sending line, Serial TxD
13 Rx iPhone receiving line, Serial RxD
14 RSVD Reserved
15 GND Ground (-), internally connected with pin 16 on iPhone motherboard
16 GND USB GND (-), internally connected with pin 15 on iPhone motherboard
17 RSVD Reserved
18 3.3V 3.3V Power (+) ?
19,20 +12V Firewire Power 12 VDC (+)
21 Accessory Indicator/Serial enable Different resistances indicate accessory type:

  1kOhm - docking station, beeps when connected

   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 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.

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 iPhone 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
connector.

This device may be connected to the firewire computer port by straight
cable (TPB+/-, TPA +/- should be twisted pairs in cable). It seems there are
no file transfer allowed, but it can charge via this interface.

 

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