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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.
location of the fan power 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 23.
Boxed Processor Fan Heatsink Power Cable Connector Description
1 2 3 4
Table 30.
Fan Heatsink Power and Signal Specifications
+12 V: 12 volt fan power supply
IC:
• Maximum fan steady-state current draw
• Average fan steady-state current draw
• Maximum 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 5 V with a resistor.
2. Open drain type, pulse width modulated.
3. Fan will have pull-up resistor for this signal to maximum of 5.25 V.
94
Signal
Pin
1
GND
2
+12 V
3
SENSE
CONTROL
4
Description
Boxed Processor Specifications
Figure 24
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
11.4
12
12.6
—
1.2
—
—
0.5
—
—
2.2
—
—
1.0
—
—
2
—
21
25
28
shows the
Unit
Notes
V
-
A
A
-
A
Second
pulses per
1
fan
revolution
2, 3
kHz
Datasheet
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