Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 84 / 139
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_SCL
131
OD
I2C clock signal of external sensor
Dedicated used for
sensors.
It cannot be used
for touch panel,
NFC, I2C keyboard
etc.
Cannot be
multiplexed into
general-purpose
GPIOs.
SENSOR_I2C_SDA
132
OD
I2C data signal of external sensor
ALPS_INT
253
DI
Interrupt signal of optical sensor
MAG_INT
254
DI
Interrupt signal of geomagnetic
sensor
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 input for channel 1 (+)
MIC1_M
45
AI
Microphone input for channel 1 (-)
MIC_GND
168
Microphone reference ground
If unused, connect to the
ground.
MIC2_P
46
AI
Microphone input for headset (+)
Headset microphone
input.
MIC3_P
169
AI
Microphone input for secondary
microphone (+)
Secondary microphone
input.
MIC_BIAS
167
AO
Microphone bias voltage