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Thermal/Mechanical Specifications and Design Guidelines
97
Boxed Processor Specifications
Baseboards must provide a matched power header to support the boxed processor.
contains specifications for the input and output signals at the fan heatsink
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 co12 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.
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 11-5. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 11-1. Fan Heatsink Power and Signal Specifications
Description
Min
Typ
Max
Unit
Notes
+12V: 12 volt fan power supply
11.4
12.0
12.6
V
—
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
—
—
—
—
1.2
0.5
2.2
1.0
—
—
—
—
A
A
A
Second
—
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.
Pin
Signal
1 2 3 4
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.
Содержание 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL S AND DESIGN GUIDELINES 01-2011
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