External microphone
An external microphone can be connected to the device via the 2.5 mm AV connector (X2101) located at the
bottom side of the main board.
The external microphone connection is able to use ECI data as well. Thus an analogue switch is applied to
the path. The switch is controlled by GenIO 43.
Figure 49 External microphone
External earpiece
An external earpiece can be connected to the device via the 2.5 mm AV connector (X2101) located at the
bottom side of the main board.
TPA6140 (N2100), located at the bottom side of the main board, is needed for the AV interface as a power
amplifier with volume control. This analogue stereo amplifier may be controlled via the I
2
C for volume
adjustment and setup of the output channels.
Figure 50 External earpiece
Figure 51 AV interface power amplifier TPA6140
RM-509; RM-510; RM-511
System Module
Issue 2
COMPANY CONFIDENTIAL
Page 5 –23
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