Audio Interfaces - Quectel SC66 Hardware Design

SENSOR_I2C_SCL 131
SENSOR_I2C_SDA 132
ALPS_INT 253
MAG_INT 254
ACCL_INT 252
GYRO_INT 255
HALL_INT 218

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
Pin Name Pin No. I/O
MIC1_P 44 AI
MIC1_M 45 AI
MIC_GND 168
MIC2_P 46 AI
MIC3_P 169 AI
MIC_BIAS 167 AO
SC66_Hardware_Design
OD I2C clock signal of external sensor
OD I2C data signal of external sensor
DI Interrupt signal of optical sensor
Interrupt signal of geomagnetic
DI
sensor
Interrupt signal of
DI
sensor
DI Interrupt signal of gyroscopic sensor
DI Interrupt signal of Hall sensor
Description
Microphone input for channel 1 (+)
Microphone input for channel 1 (-)
Microphone reference ground
Microphone input for headset (+)
Microphone input for secondary
microphone (+)
Microphone bias voltage
Smart LTE Module Series
SC66 Hardware Design
Dedicated used for
sensors.
It cannot be used
for touch panel,
NFC, I2C keyboard
etc.
Cannot be
multiplexed into
general-purpose
GPIOs.
acceleration
Comment
If unused, connect to the
ground.
Headset microphone
input.
Secondary microphone
input.
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