Siemens C55 Repair Documentation

V1.20 Page 42 of 48 ICM MP CCQ GRM
A55/C55_Hitachi Company Confidential © Copyright Siemens AG 04/03
7.5 IO Connector with ESD protection
7.5.1 IO Connector – New Slim Lumberg
Pin
Name IN/OUT Notes
1 POWER I/O POWER is needed for charging batteries and for supplying
the accessories. If accessories are supplied by mobile,
talk-time and standby-time from telephone are reduced.
Therefore it has to be respected on an as low as possible
power consumption in the accessories.
2 GND
3 TX O Serial interface
4 RX I serial interface
5 DATA/CTS I/O Data-line for accessory-bus
Use as CTS in data operation.
6 RTS I/O Use as RTS in data-operation.
7 CLK/DCD I/O Clock-line for accessory-bus.
Use as DTC in data-operation.
8 AUDIO_L Analog
O
driving ext. left speaker
With mono-headset Audio_L and Audio_R differential
mode
9 AUDIO_RE
F
Analog
O
mid-voltage
in stereo mode reference to
AUDIO_L and AUDIO_R in mono mode not used
10 AUDIO_R Analog
O
driving ext. right speaker With mono-headset Audio_L and
Audio_R differential Signal
11 GND_MIC Analog
I
for ext. microphone
12 MICP2 Analog
I
External microphone

Siemens C55 Specifications

General

Brand	Siemens
Model	C55
Category	Cell Phone
Language	English