DFI 686IPK, User Manual, Page: 35 / 78

35
Pin
1
2
3
4
5
Function
IRTX
GND
IRRX
IRR3
VCC
Fan Connector
We highly recommend that you attach a fan to the heatsink of your
processor to prevent overheating the processor. The 686IPK system
board supports processor fan “failure detection” function. To use this
function, your processor fan must also support this feature. The “failure
detection” circuit requires a processor fan that operates at greater than
3600 RPM. If your fan fails to function, it will alert you to attend to any
problem that may damage your system or processor. Jumper JP5 must
be set to On to enable this function. Refer to the Jumper Settings for
Processor Fan Failure Detection section for more information.
Connecting the Fan
Connect the fan’s power cable to J4 on the system board. Please note -
the connector on your fan must be a 3-pin connector and the third pin
an “open collector” type.
Pin
1
2
3
Function
Ground
+12V
Sense
(open collector type)