22 i2c interface, I2c interface – Kontron SMARC-sAT30 User Manual
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User’s Guide
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3.2.22 I2C Interface
There are five I2C buses defined in the SMARC specification: PM (Power Management), LCD (Liquid Crystal
Display), GP (General Purpose), CAM (Camera) and HDMI. The sAT30 supports multiple masters and slaves in fast
mode (400 KHz operation). A high speed mode (3.4 MHz) option also exists, although many I2C peripherals may have
trouble with this. The I2C interface signals are exposed on the SMARC sAT30 edge connector as shown below:
SMARC sAT30 Edge finger
NVIDIA T30 CPU
Net Name
Notes
Pin #
Pin Name
Pin #
Pin Name
PM I2C
P121
I2C_PM_CK
M24
PWR_I2C_SCL
PWR_I2C_SCL_1V8
Power management
I2C bus clock
P122
I2C_PM_DAT
N27
PWR_I2C_SDA
PWR_I2C_SDA_1V8
Power management
I2C bus data
GP I2C
S48
I2C_GP_CK
G5
GEN2_I2C_SCL
GEN2_I2C_SCL_1V8
General purpose I2C
bus clock
S49
I2C_GP_DAT
G7
GEN2_I2C_SDA
GEN2_I2C_SDA_1V8
General purpose I2C
bus data
CAM I2C
S5
I2C_CAM_CK
AG5
CAM_I2C_SCL
I2C_CAM_CLK
I2C Camera support
clock
S7
I2C_CAM_DAT
AH7
CAM_I2C_SDA
I2C_CAM_DAT
I2C Camera support
data
LCD I2C
S139
I2C_LCD_CK
AB25
GEN1_I2C_SCL
LCD_DDC_CLK
LCD display I2C bus
clock
S140
I2C_LCD_DAT
V29
GEN1_I2C_SDA
LCD_DDC_DATA
LCD display I2C bus
data
HDMI I2C
P105
HDMI_CTRL_CK
AG14
DDC_SCL
HDMI_DDC_SCL_1V8
HDMI dedicated I2C
Clock
P106
HDMI_CTRL_DAT
AJ10
DDC_SDA
HDMI_DDC_SDA_1V8
HDMI dedicated I2C
Data