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Active Tower Thermal Solution
86 Thermal/Mechanical Specifications and Design Guidelines
The power header on the baseboard must be positioned to allow the fan power cable to
reach it. The power header identification and location should be documented in the
platform documentation, or on the system board itself. Figure 10-5 shows the 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 10-4. Fan Power Cable Connector Description
Table 10-1. Fan Power and Signal Specifications
Description Min Typ Max Unit Notes
+12V: 12 volt fan power supply 9.0 12.0 13.8 V —
IC:
• Maximum fan steady-state current draw
• Maximum fan start-up current draw
—
—
1.2
3.0
—
—
A
A
—
SENSE: SENSE frequency — 2 — pulses per fan
revolution
1
Notes:
1. Baseboard should pull this pin up to 5V with a resistor.
CONTROL 21 25 28 kHz
2, 3
2. Open drain type, pulse width modulated.
3. Fan will have pull-up resistor for this signal to maximum of 5.25 V.
Figure 10-5. Baseboard Power Header Placement Relative to Processor Socket
Pin
Signal
12
34
1
2
3
4
GND
+12 V
SENSE
CONTROL
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.
B
C
R110
[4.33]