Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 54 / 130
3.15. I2C Interfaces
SC20 module provides three I2C interfaces which only support the master mode. As an open drain output,
the I2C interfaces need a pull-up resistor on its external circuit, and the recommended logic level is 1.8V.
Table 18: Pin Definition of I2C Interfaces
3.16. ADC Interfaces
SC20 module provides three analog-to-digital converter (ADC) interfaces, and the pin definition is shown
below.
Table 19: Pin Definition of ADC Interfaces
The resolution of the ADC is up to 16 bits and the effective resolution is 12 bits.
Pin Name
Pin No
I/O Description
Comment
TP_I2C_SCL
47
OD
I2C clock signal of touch panel
Used for touch panel
TP_I2C_SDA
48
OD
I2C data signal of touch panel
CAM_I2C_SCL
83
OD
I2C clock signal of camera
Used for camera
CAM_I2C_SDA
84
OD
I2C data signal of camera
SENSOR_I2C_
SCL
91
OD
I2C clock signal for external sensor
Used for external sensor
SENSOR_I2C_
SDA
92
OD
I2C data signal for external sensor
Pin Name
Pin No
I/O Description
Comment
ADC
128
AI
General purpose ADC
Max input voltage is 1.7V
VBAT_SNS
133
AI
Input voltage sense
Max input voltage is 4.5V
VBAT_THERM
134
AI
Battery temperature detection
Internal pull-up; externally
connect to GND with a 47K NTC
thermistor