Siemens C25 and S25 Pinouts

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1 2 11 12

Siemens S25/C25 Pinout diagram, seen from bottom of phone when the phone keyboard is on top

Pin	Name	Function	in/out
1	GND	Ground
2	SELF-SERVICE	Recognition/control battery charger	in/out
3	LOAD	Charging voltage	in
4	BATTERY	Battery (S25 only)	out
5	DATA OUT	Data sent (S25 only)	out
6	DATA IN	Data received (S25 only)	in
7	Z_CLK	Recognition/control accessories
8	Z_DATA	Recognition/control accessories
9	MICG	Ground for microphone	in
10	MIC	Microphone input
11	AUD	Loudspeaker	out
12	AUDG	Ground for external speaker

Notes:

The telephone detects the attached battery charger via Pin 2 and controls this via a PCM signal at the same pin.
Accessories are detected via Pins 7 and 8
The Headset identifies itself through HIGH/LOW instead of HIGH/HIGH

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