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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 supports 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.
A7V333
®
A7V333 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
A7V333
®
1
SMBCLK
Ground
SMBDATA
+3V
A7V333 SMBus Connector
SMB
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.