SIM340DZ EVB User Guide
3.2 Audio Interface
Figure 5: Audio Interface
Headset interface:
Pin
Signal
I/O
Description
1
MIC1P
I
Positive microphone input
2
SPK1P
O
Positive receiver output
3
SPK1N
O
Negative receiver output
4
MIC1N
I
Negative microphone input
Earphone interface:
Pin
Signal
Input/Output
Description
5 MIC2P&SPK2P I/O
Auxiliary positive input and output
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