DFI COM100-B - Manual (Page 28)

www.dfi.com Chapter 2 Hardware Installation
28
Chapter 2
The 1-channel I 2 C bus interface conforms to the version 2.1 I 2 C bus specification. It operates
as a master or slave device and supports a multi-master bus.
I 2 C Connector
COM1
COM2
I C
COM2
COM1
1 2
5 6
3V3 Standby GND
I 2 C_Clock I 2 C_DATA
NC NC
I 2 C
SMBus Connector
The SMBus (System Management Bus) connectors are used to connect the SMBus device. It is
a multiple device bus that allows multiple chips to connect to the same bus and enable each
one to act as a master by initiating data transfer.
COM1
COM2
I C
COM2
COM1
SMBus
6 5
2 1
GND
NC
SMB_DATA
3V3SB
SMB_CLK
SMB_ALERT