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FIBOCOM SC138-
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Series Hardware Guide
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width.
8)
The total stray capacitance of devices on MIPI differential signal line should not exceed 1pF.
Other signal line design considerations:
1)
CAM_CLK is a high-speed clock signal and needs to be surrounded by grounding lines in a three-
dimensional manner.
2)
If the front and rear cameras share I2C, the I2C addresses of the two cameras should be confirmed
that there is no conflict.
3)
The analog voltage AVDD route should be away from the interference source to avoid the power
noise.
4)
It is recommended to place an LDO with high power supply rejection ratio close to the camera
AVDD.
3.18
Sensor
SC138 supports I2C communication with various sensors, including accelerometers, distance and
ambient light sensors, geomagnetic sensors, gyroscopes, etc.
Table 3-19 Sensor interface pin definition
Pin Name
Pin No.
I/O
Description
Remarks
SNS_I2C_SCL
87
OD
I2C clock
-
SNS_I2C_SDA
88
OD
I2C data line
-
ALSP_INT_N
106
DI
Interrupt signal of ambient light
sensor
-
MAG_INT_N
107
DI
Interrupt signal of geomagnetic
sensor
-
ACCL_INT2_N
108
DI
G-Sensor interrupt signal 2
-
ACCL_INT1_N
109
DI
G-Sensor interrupt signal 1
-
