User's Manual

MeiG hardware design guide
25
4.14 I2C Bus Interface
The SLM756P module supports multiple hardware I2C bus interfaces. The default I2C pin definition
functions are as follows:
Table 4.11: Default I2C Interface Pin Description
Name
Pin
Default function
CAM_I2C_SDA
23
Camera dedicated I2C
CAM_I2C_SCL
24
SENSOR_I2C_SDA
59
General purpose I2C, default for sensor
SENSOR_I2C_SCL
58
TP_I2C_SDA
72
General purpose I2C, default for TP
TP_I2C_SCL
71
Note: 1 These 3 groups of I2C have been internally pulled up to VERG_L6_1P8 by default 2.2K, so they cannot be used
as normal GPIOs.
2 For other I2C signals, please refer to the table (3.3 Multiplexing Function). If necessary, add an external pull-up
resistor.
4.15 Analog to Digital Converter (ADC)
The SLM756P module provides two MPP function signals from the power management chip. MPP4 is
the ADC input signal and MPP2 is the 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
Measurement range can
be selected by software
programming
0.1
-
1.7
V
0.3
-
4.5
ADC Resolution
-
16
-
Bits
Analog Input Bandwidth
-
100
-
kHz
Sampling Frequency
-
2.4M
-
MHz
INL
-
-
±8
LSB
DNL
-
-
±4
LSB
Error
Offset error
-
-
±1
%
Gain error
-
-
±1
%
4.16 PWM
The PWM pin can be used as a backlight adjustment for the LCD to adjust the backlight brightness by
adjusting the duty cycle.