Smbus; I 2 C Bus - ADLINK Technology intel COM Express Express-TL User Manual

Express-TL User's Guide

4.3.11 SMBus

Name Pin # Description
SMB_CK B13 System Management Bus bidirectional clock line. Power
sourced through 3.3V standby rail and main power rails.
SMB_DAT# B14 System Management Bus bidirectional data line. Power
sourced through 3.3V standby rail and main power rails.
SMB_ALERT# B15 System Management Bus Alert – active low input can be
used to generate an SMI# (System Management
Interrupt) or to wake the system. Power sourced through
3.3V standby rail and main power rails.
4.3.12 I C Bus
2
Name Pin # Description
I2C_CK B33 General purpose I²C port clock output/input
I2C_DAT B34 General purpose I²C port data I/O line
Page 38
I/O
I/O OD
3.3VSB
I/O OD
3.3VSB
I 3.3VSB
I/O
I/O OD
3.3VSB
I/O OD
3.3VSB
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PU / PD Comment
PU 2.2K
3.3VSB
PU 2.2K
3.3VSB
PU 4.7K
3.3VSB
PU / PD Comment
PU 2.2K Source SEMA BMC as default (chipset by BOM
3.3VSB option)
PU 2.2K Source SEMA BMC as default (chipset by BOM
3.3VSB option)
PICMG COM.0 R3.0