Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 59 / 111
3.20. Audio Interfaces
The module provides three analog input channels and three analog output channels. The following table
shows the pin definition.
Table 26: Pin Definition of Audio Interfaces
Pin Name
Pin No.
I/O
Description
Comment
MIC1_P
4
AI
Microphone input for channel 1 (+)
MIC1_N
5
AI
Microphone input for channel 1 (-)
MIC2_P
6
AI
Microphone input for headset (+)
MIC2_N
148
AI
Microphone input for headset (-)
MIC_BIAS2
149
PO
Microphone bias voltage 2
Vmin = 2.20 V
Vmax = 3.00 V
Vnom = 2.80 V
MIC3_P
152
AI
Microphone input for channel 2 (+)
MIC3_N
151
AI
Microphone input for channel 2 (-)
MIC_BIAS1
147
PO
Microphone bias voltage 1
Vmin = 2.20 V
Vmax = 3.00 V
Vnom = 2.50 V
EAR_P
8
AO
Earpiece output (+)
EAR_N
9
AO
Earpiece output (-)
SPK_P
10
AO
Speaker output (+)
SPK_N
11
AO
Speaker output (-)
HPH_R
136
AO
Headphone right channel output
HPH_REF
137
AO
Headphone reference ground
If it is not used, connect it
to ground.
HPH_L
138
AO
Headphone left channel output
HS_DET
139
AI
Headset insertion detect
High level by default.
HPMIC_DET
150
AI
Headphone microphone detect