Product Info

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