Computer Hardware User Manual

32 Chapter 2: Hardware information
13)Power Supply Connectors (20-pin block ATXPWR)
This connector supports an ATX 12V power supply. The plug from the power
supply fits in only one orientation. Push down firmly ensuring that the pins
are aligned.
14)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 multi-device bus that
permits multiple chips to connect to the same bus and enable each one to
act as a master by initiating data transfer.
®
A7V266-M
A7V266-M ATX Power Connectors
ATXPWR
Pin 1
+3.3VDC
-12.0VDC
COM
PS_ON#
COM
COM
COM
-5.0VDC
+5.0VDC
+5.0VDC
PWR_OK
+12.0VDC
+3.3VDC
+3.3VDC
COM
+5.0VDC
COM
+5.0VDC
COM
+5VSB
®
A7V266-M
A7V266-M SMBus Connector
SMB_COM
SMBCLK
Ground
SMBDATA
+3V
1
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.