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Boxed Processor Specifications
The fan heatsink outputs a SENSE signal that is an open-collector output that pulses at a rate of
2 pulses per fan revolution. A baseboard pull-up resistor provides V
mounted fan speed monitor requirements, if applicable. Use of the SENSE signal is optional. If the
SENSE signal is not used, pin 3 of the connector should be tied to GND.
The fan heatsink receives a PWM signal from the motherboard from the 4th pin of the connector
labeled as CONTROL.
The boxed processor's fan heatsink requires a constant +12 V supplied to pin 2 and does not
support variable voltage control or 3-pin PWM control.
The power header on the baseboard must be positioned to allow the fan heatsink power cable to
reach it. The power header identification and location should be documented in the platform
documentation, or on the system board itself.
connector relative to the processor socket. The baseboard power header should be positioned
within 110 mm [4.33 inches] from the center of the processor socket.
Figure 7-5. Boxed Processor Fan Heatsink Power Cable Connector Description
1 2 3 4
Table 7-1. Fan Heatsink Power and Signal Specifications
+12 V: 12 volt fan power supply
IC:
Peak Fan current draw
Fan start-up current draw
Fan start-up current draw maximum duration
SENSE: SENSE frequency
CONTROL
NOTES:
1.
Baseboard should pull this pin up to 5V with a resistor.
2.
Open drain type, pulse width modulated.
3.
Fan will have pull-up resistor to 4.75 V maximum of 5.25 V.
92
Signal
Pin
1
GND
+12 V
2
3
SENSE
CONTROL
4
Description
OH
Figure 7-6
shows the location of the fan power
Straight square pin, 4-pin terminal housing with
polarizing ribs and friction locking ramp.
0.100" pitch, 0.025" square pin width.
Match with straight pin, friction lock header on
mainboard.
Min
Typ
Max
10.2
12
13.8
1.1
1.5
—
—
2.2
—
1.0
—
2
—
21
25
28
to match the system board-
Boxed_Proc_PwrCable
Unit
Notes
V
-
A
-
A
Second
pulses per fan
1
revolution
2, 3
kHz
Datasheet
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