Figure 116 External earpiece circuitry (Pop-Port connected on the right)
Pop-port
TM
connector
Pop-Port
TM
connector provides a fully differential 4–wire stereo line-level output connection and fully
differential 2-wire mono line-level or microphone level input connection.
The handsfree driver in Retu is meant for the headset.
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 117 External audio connector
Table 18 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.)
RM-42
Nokia Customer Care
System Module
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Company Confidential
9241872 (Issue 1)
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