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SLM500 Hardware Design Guide Page 51
4.13 I2C Bus Interface
The SLM500 module supports five hardware I2C bus interfaces include two camera-specific
CCI interface. The pin definitions and default functions are as follows:
Table 4.11: I2C Interface Pin Description
Name
Pin
Default function
GPIO14_SENSOR_I2C4_SDA
92
Dedicated I2C for sensors only|( G-sensor, compass,
gyroscope, etc.)
GPIO15_SENSOR_I2C4_SCL
91
GPIO29_CAM_I2C_SDA0
84
Main Camera dedicated
GPIO30_CAM_I2C_SCL0
83
GPIO32_DCAM_I2C_SCL1
166
Depth Camera 专用
GPIO31_DCAM_I2C_SDA1
205
GPIO10_TP_I2C3_SDA
48
General purpose I2C, default for TP
GPIO11_TP_I2C3_SCL
47
GPIO6
167
Universal I2C
Note: To use the 2.2KΩ pull-up resistor to 1.8V .
Gpio14 / 15 can only be used to connect sensor devices in Qualcomm QVL, not other
devices.
4.14 Analog to Digital Converter (ADC)
The SLM500 module provides two MPP function signals from the power
management chip: PWM（29PIN） and ADC（128PIN）, MPP can be configured as
an ADC or PWM signal.
The ADC signal is 16 bit resolution, and its performance parameters are as follows:
Table 4.12: ADC Performance Parameters
Description
Minimum
Typical
Maximum
Unit
Input Voltage Range
-
1.8
-
V
ADC Resolution
-
-
15
bits
Analog Input Bandwidth
-
100
-
kHz
Sampling Frequency
-
2.4
-
MHz
INL
-
-
±8
LSB
DNL
-
-
±4
LSB
Offset error
-
-
±1
%
Gain error
-
-
±1
%
4.15. PWM
The PWM pin can be used as a backlight adjustment for the LCD to adjust the backlight
brightness by adjusting the duty cycle.