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38 ASUS A7V266-EX User’s Manual
3. HARDWARE SETUP
Connectors
3. H/W SETUP
15) Power Supply Connectors (20-pin block ATXPWR)
This connector connects to an ATX 12V power supply. The plug from the power
supply fits in only one orientation because of the different hole sizes. Find the
proper orientation and push down firmly making sure that the pins are aligned.
16) SMBus Connector (5-1 pin SMB)
This connector allows you to connect SMBus (System Management Bus) devices.
SMBus devices communicate by means of the SMBus with an SMBus host
and/or other SMBus devices. SMBus is a specific implementation of an I
2
C bus,
a multi-device bus that allows multiple chips to connect to the same bus and
enabling each one to act as a master by initiating data transfer.
IMPORTANT: Make sure that the ATX 12V power supply (minimum
recommended wattage: 230W) can supply at least 10mA on the +5-volt standby
lead (+5VSB). The system may become unstable and may experience difficulty
powering up if the power supply is inadequate. For Wake-On-LAN support, the
ATX power supply must supply at least 720mA +5VSB.
R
A7V266-EX
A7V266-EX ATX Power Connector
+3.3Volts
-12.0Volts
Ground
Power Supply On
Ground
Ground
Ground
-5.0 Volts
+5.0 Volts
+5.0 Volts
Power Good
+12.0Volts
+3.3 Volts
+3.3 Volts
Ground
+5.0 Volts
Ground
+5.0 Volts
Ground
+5V Standby
R
A7V266-EX
SMBCLK
Ground
SMBDATA
+3V
1
A7V266-EX SMBus Connector
SMB_COM