I2C; Gpio; Smb - Kontron COMh-sdID User Manual

3.4.11 I2C

Two general purpose I2C ports are defined for COM-HPC.
On the COMh-sdID several I2C interfaces are managed by the EC (embedded controller).
COM-HPC EC Description
I2C0_CLK I2C02_SCL
General I2C with 3.3V Power Rail
I2C0_DAT I2C02_SDA
I2C1_CLK I2C03_SCL
General I2C with 1.8V Power Rail
I2C1_DAT I2C03_SDA
IPMB_CLK I2C06_SCL
IPMB (Intelligent Platform Management Bus)
IPMB_DAT I2C06_SDA
Table 21: I2C interfaces on COMh-sdID

3.4.12 GPIO

The COMh-sdID offers 12 GPIO pins on the dedicated pins of COM-HPC®. The type of termination
resistor used sets the direction of the GPIO; where GPI terminations are pull-up resistors, and GPO
terminations are pull-down resistors.
Due to the fact that both the pull-up and pull-down termination resistors are weak, it is possible to
override the termination resistors using external pull-ups, pull-downs or IOs. Overriding the
termination resistors means that the 12 GPIO pins can be considered as bi-directional since there are
no restrictions whether you use the available GPIO pins in the in-direction or out-direction.

3.4.13 SMB

The System Management Bus (SMB) is a simple 2-wire bus for low-speed system management
communication. The PCH or the SOC controls the SMB. The module's SMB connects typically to the
memory and the hardware controller.
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