The output is driven in a fully differential mode. In the fully differential mode, the handsfree pin is the
negative output and the HFCM pin is the positive output. The gain of the handsfree driver in the differential
mode is 6 dB.
The earpiece and headset signals are multiplexed so that the outputs cannot be used simultaneously.
Figure 92 External audio connector
Table 22 Audio connector pin assignments
Pin #/ Signal
name
Signal
description
Spectral range
Voltage/
Current levels
Max or
nominal serial
impedance
Notes
1/ Charge
V Charge
DC
0-9V/ 0.85A
2/ GND
Charge GND
-
0.85A
100mΩ (PWB+
conn.)
3/ ACI
ACI
1kbits/s
Digital 0 /
47Ω
Insertion &
removal
detection
2.5-2.78V
4/ Vout
DC out
DC
2.78V 70 mA
100mΩ (PWB+
conn.)
200mW
2.5V 90mA
9 / XMIC N
Audio in
300-8k
1Vpp &
2.5-2.78VDC
10 / XMIC P
Audio in
300-8k
1Vpp &
2.5-2.78VDC
11 / HEAR N
Audio out
20-20k
1Vpp
10Ω
12 / HEAR P
Audio out
20-20k
1Vpp
10Ω
13 / HEAR R N
Audio out
20-20k
1Vpp
10Ω
Not conn. in
mono
14 / HEAR R P
Audio out
20-20k
1Vpp
10Ω
Not conn. in
mono
RM-132; RM-133
System Module
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 9 –25
Copyright © 2006 Nokia. All rights reserved.
