Boxed Processor Fan Heatsink Power Cable Connector Description; Fan Heatsink Power And Signal Specifications - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL SPECIFICATIONS AND DESIGN GUIDELINES 01-2011 Specifications

Boxed Processor Specifications
Baseboards must provide a matched power header to support the boxed processor.
Table 11-1
connector.
The fan heatsink outputs a SENSE signal, which is an open- collector output that pulses
at a rate of 2 pulses per fan revolution. A baseboard pull-up resistor provides VOH to
match the system board-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.
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 11-5. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 11-1. Fan Heatsink Power and Signal Specifications
+12V: 12 volt fan power supply
IC:
• Maximum fan steady-state current draw
• Average steady-state fan 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 5V 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.
Thermal/Mechanical Specifications and Design Guidelines
contains specifications for the input and output signals at the fan heatsink
Pin Signal
1 GND
+12 V
2
3 SENSE
CONTROL
4
1 2 3 4
Description
Figure 11-6
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 12.0 12.6
— 1.2 —
— 0.5 —
— 2.2 —
— 1.0 —
— 2 —
21 25 28
shows the
Unit Notes
V —
—
A
A
A
Second
1
pulses per fan
revolution
2, 3
kHz
97