EVB User Guide
M80_EVB_UGD_V1.0
- 13 -
3.2.
Audio interface
3&4
1
2
3
4
1
2
3
4
1
2
3
4
Channel 2
Channel 1
Channel 2
PCM channel
Figure 5: Audio interface
Table 3: Pins of PCM channel
Pin
Signal
I/O
Description
Note
1
MIC2N
I
Negative microphone input
2
SPK2N
O
Negative receiver output
3
SPK2P
O
Positive receiver output
4
MIC2P
I
Positive microphone input
An earphone or handset can be used in audio channel 2.
Table 4: Pins of audio channel 2
Pin
Signal
I/O
Description
Note
1
MIC2N
I
Negative microphone input
2
AGND
AGND of audio circuits
3
SPK2P
O
Positive receiver output
4
MIC2P
I
Positive microphone input
An earphone or handset can be used in audio channel 2.
Quectel
Confidential
