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SMBUS Connector
The SMBus (I
2
C) connector can be
used to monitor the status of the
power supply, fan and system tem-
perature. See the table on the right
for pin defi nitions.
SMB Power Supply Connector
The SMB Power Supply (I
tor is designated SMB_PS1. Connect
the appropriate cable here to utilize
SMB on your system. See the table
on the right for pin defi nitions.
Overheat LED/Fan Fail (JOH1)
The JOH1 header is used to connect
an LED to provide warning of chassis
overheating. This LED will blink to in-
dicate a fan failure. Refer to the table
on right for pin defi nitions.
I-Button
An onboard I-Button, located next to
USB Ports 2~3, is a 1-wire computer
chip enclosed in a durable stainless
steel can. The I-Button stores instruc-
tions, provides electronic interface
and allows HostRAID to operate with
Mega-RAID fi rmware.
Onboard Power LED
An onboard Power LED header is
located at JLED1. This Power LED
header is connected to Front Control
Panel located at JF1 to indicate the
status of system power. See the table
on the right for pin defi nitions.
Chapter 5: Advanced Serverboard Setup
Pin#
1
2
3
4
5
2
C) connec-
OH/Fan Fail LED
States
State
Solid
Blinking
5-19
SMBUS Connector
Pin Defi nitions (SMBUS)
Defi nition
Clock
Data
PWR Fail (Input from PS to MB)
Ground
+3.3V
Power SMB Header
Pin Defi nitions (SMB_PS1)
Pin#
Defi nition
1
Clock
2
Data
3
PWR Fail
4
Ground
5
+3.3V
Overheat LED
Pin Defi nitions (JOH1)
Message
Pin#
Defi nition
Overheat
1
5vDC
Fan Fail
2
OH Active
Onboard PWR LED
Pin Defi nitions
Pin#
Defi nition
1
VCC
2
No Connection
3
Connection to PWR
LED in JF1
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