User Guide

RH-21 Company Confidential
System Module Nokia Customer Care
Page 34  2004 Nokia Corporation. Issue 2 07/2004
0 EARP UEM Ear-
piece
Out Ana 1.25V Audio Differential signal to HP
internal Earpiece.
Load resistance 32 ohm.
1EARN
2 MIC1N Mic UEM In Ana 100mVpp
max diff.
Audio,
AC cou-
pled to
UEM
Differential signal from HP
internal MIC
3MIC1P
4MICB1 Mic UEMOutV
bias
2.1V typ./
<600 uA
Bias voltage for internal
MIC
System Connector HP Internal microphone IF between System Connector and Mic/ear circuitry
MIC+ Mic Audio
- UEM
In
Out
Ana
Bias
2mV nom
2V2kohm
Audio
DC bias
Mic bias and audio signal.
Microphone mounted into
system connector
MIC In GN
D
0 (GND) Connected to GND at UEM
Earpiece Connector Pads HP Internal IF between Earpiece and Mic/Ear circuitry
“1”-EARP EAR Audio
-
UEM-
EAR
P/N
Out Ana 1.25V Diff DC
coupled
Audio
Differential audio signal to
earpiece 32 ohm
RIP
Signal
name
Connected
from - to
AUDIO
I/O
Signal Properties
A/D Levels-Freq./
Timing resolution
Description / Notes
EXTERNAL AUDIO INTERFACE
XAUDIO(9:0)* External Audio IF between UEM and X-audio circuitry
0 HEADINT SysCon/
HSet
UEM Out Dig 0/2.7V Output to UEM for Headset
Connector “HeadInt” Switch
1 HF UEM SysCon
/HSet
In Ana 1.0Vpp
bias 0.8V
Audio ExternalEarpiece Audio Sig-
nal
Reference for DC coupled
external Earpiece
2 HFCM Ana 0.8 Vdc
3MICB2 UEM SysCon
/HSet
Out V
bias
2.1V tvp/
600 uA
Bias voltage for external
MIC
4MIC2P
MIC2N
SysCon/
Head-
Set
UEM Out Ana 200mVpp
max diff
Audio Differential signal from
external MIC
5
RIP
Signal
name
Connected
from - to
AUDIO
I/O
Signal Properties
A/D Levels-Freq./
Timing resolution
Description / Notes