Intel Pentium 4 672 HH80547PG1122MH User Manual
Product codes
HH80547PG1122MH
Intel
®
Pentium
®
4 Processor in the 423-pin Package
84
8.3
Boxed Processor Requirements
8.3.1
Fan Heatsink Power Supply
The boxed processor's fan heatsink requires a +12V power supply. A fan power cable will be
shipped with the boxed processor to draw power from a power header on the system board. The
power cable connector and pinout are shown in Figure 31. Platforms must provide a matched
power header to support the boxed processor. Table 37 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 two pulses per fan revolution. A system board 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.
shipped with the boxed processor to draw power from a power header on the system board. The
power cable connector and pinout are shown in Figure 31. Platforms must provide a matched
power header to support the boxed processor. Table 37 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 two pulses per fan revolution. A system board 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 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 32 shows the location of the fan power
connector relative to the processor socket. The system board power header should be positioned
within 4.33 inches from the center of the processor socket.
reach it. The power header identification and location should be documented in the platform
documentation, or on the system board itself. Figure 32 shows the location of the fan power
connector relative to the processor socket. The system board power header should be positioned
within 4.33 inches from the center of the processor socket.
NOTE:
1. System board should pull this pin up to V
CC
with a resistor.
Figure 31. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 37. Fan Heatsink Power and Signal Specifications
Description
Min
Typ
Max
Unit
Notes
+12V: 12 volt fan power supply
10.2
12
13.8
V
IC: Fan current draw
300
mA
SENSE: SENSE frequency
2
pulses/
rev
rev
1