521 datasheet(92/96 Pages) INTEL

92 / 96 page

Datasheet

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 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. Figure 7-6 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 7-5. Boxed Processor Fan Heatsink Power Cable Connector Description

Table 7-1. Fan Heatsink Power and Signal Specifications

Description

Min

Typ

Max

Unit

Notes

+12 V: 12 volt fan power supply

10.2

13.8

IC:

Peak Fan current draw

Fan start-up current draw

Fan start-up current draw maximum duration

—

1.1

—

1.5

2.2

1.0

Second

SENSE: SENSE frequency

—

pulses per fan

revolution

NOTES:

Baseboard should pull this pin up to 5V with a resistor.

CONTROL

kHz

2, 3

Open drain type, pulse width modulated.

Fan will have pull-up resistor to 4.75 V maximum of 5.25 V.

Boxed_Proc_PwrCable

Signal

12 34

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.

521 데이터시트(PDF) 92 Page - Intel Corporation

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