Product Info
Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 29 / 118
43,47,
56,62,
87,98,
101,112,
125,128,
130,133,
135,148,
150,159,
160,163,
166,170,
173,176,
182,193,
195,219,
225,243,
257~323
Audio Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
MIC_BIAS
167
AO
Microphone bias
voltage
V
O
=1.6V~2.9V
MIC1_P
44
AI
Microphone positive
input for channel 1
MIC1_M
45
AI
Microphone
negative input for
channel 1
MIC_GND
168
Microphone
reference ground
If unused, it should
be connected to
GND
MIC2_P
46
AI
Microphone
Headset mic input










