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Datasheet

Boxed Processor Specifications

7.2

Electrical Requirements

7.2.1

Fan Heatsink Power Supply

The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable will be

shipped with the boxed processor to draw power from a power header on the baseboard. The power

cable connector and pinout are shown in Figure 7-4. Baseboards must provide a matched power

header to support the boxed processor. Table 7-1 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.

Note:

The motherboard must supply a constant +12 V to the processor's power header to ensure proper

operation of the variable speed fan for the boxed processor.

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 7-7 shows the location of the fan power

connector relative to the processor socket. The baseboard power header should be positioned

within 4.33 inches from the center of the processor socket.

Figure 7-4. 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: Fan current draw

—

740

—

SENSE: SENSE frequency

—

pulses per fan

revolution

NOTES:

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

Signal

Straight square pin, 3-pin terminal housing with

polarizing ribs and friction locking ramp.

0.100" pin pitch, 0.025" square pin width.

Waldom*/Molex* P/N 22-01-3037 or equivalent.

Match with straight pin, friction lock header on motherboard

Waldom/Molex P/N 22-23-2031, AMP* P/N 640456-3,

or equivalent.

GND

+12V

SENSE

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