Microphone; Battery - Siemens A55 Repair Documentation

7.3 Microphone

XG242
Pin Name
1 MICP1
2 MICN1
3 GND_MIC

7.4 Battery

XG181
Pin Name
1 GND
2 AKKU_TYP
3 BATT+
V1.20
A55/C55_Hitachi
IN/OUT Remarks
O Microphone power supply. The same line
carries the low frequency speech signal.
I Speech signal. The same line carries the
microphone power supply.
Level Remarks
- Ground
0V...2.65V Recognition of battery/supplier
3 V... 4.5V Positive battery pole
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04/03