Product Info

Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 82 / 118
3.22. Audio Interfaces
SC66 module provides three analog input channels and three analog output channels. The following table
shows the pin definition.
Table 30: Pin Definition of Audio Interfaces
SENSOR_I2C_SDA
132
OD
I2C data signal of external sensor
used for
sensors.
It cannot be
used for touch
panel, NFC,
I2C keyboard.
ALPS_INT
253
DI
Interrupt signal of optical sensor
MAG_INT
254
DI
Interrupt signal of direction sensor
(compass)
ACCL_INT
252
DI
Interrupt signal of acceleration sensor
GYRO_INT
255
DI
Interrupt signal of gyroscopic sensor
HALL_INT
218
DI
Interrupt signal of Hall sensor
Pin Name
Pin No.
I/O
Description
Comment
MIC1_P
44
AI
Microphone positive input for Main Mic
MIC1_N
45
AI
Microphone negative input for Main Mic
MIC_GND
168
Microphone reference ground
If unused, connect this
pin to the ground.
MIC2_P
46
AI
Microphone positive input for headset
MIC3_P
169
AI
Microphone positive input for secondary
mic
MIC_BIAS
167
AO
Microphone bias voltage
EAR_P
53
AO
Earpiece positive output
EAR_N
52
AO
Earpiece negative output
SPK_P
55
AO
Speaker positive output