Audio Interface - Quectel SC200L-EM Hardware Design

3.20. Audio Interface

SC200L module provides three analog input channels and three analog output channels. The following
table shows the pin definition.
Table 23: Pin Definition of Audio Interfaces
Pin Name Pin No
MIC1_P 4
MIC1_N 5
MIC2_P 6
MIC2_N 148
MIC_BIAS2 149
MIC3_P 152
MIC3_N 151
MIC_BIAS1 147
EAR_P 8
EAR_N 9
SPK_P 10
SPK_N 11
HPH_R 136
HPH_REF 137
HPH_L 138
HS_DET 139
HPMIC_DET 150
The module has three sets of audio inputs, including three sets of differential input channels

 The output voltage range of two MIC_BIAS is programmable between 2.2V and 3.0V, and the
SC200L_Hardware_Design
I/O Description
AI Main microphone input (+)
AI MIC reference ground
Headphone microphone
AI
input (+)
Headphone microphone
AI
input (-)
PO Microphone bias voltage 2
Secondary microphone input
AI
(+)
Secondary microphone input
AI
(-)
PO Microphone bias voltage 1
AO Earpiece output (+)
AO Earpiece output (-)
AO Speaker output (+)
AO Speaker output (-)
Headphone right channel
AO
output
Headphone reference
AO
ground
Headphone left channel
AO
output
AI Headset insertion detection
Headphone microphone
AI
detection
SC200L Hardware Design
Comment
No need to connect to
ground
The default is high
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