參數(shù)資料
型號： BX80525U667256E
廠商： INTEL CORP
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 667 MHz, MICROPROCESSOR, XMA
文件頁數(shù)： 95/102頁
文件大小： 878K
代理商： BX80525U667256E
92
Datasheet
Pentium III Processor for the SC242 at 450 MHz to 800 MHz
6.3
Fan Heatsink Electrical Requirements
6.3.1
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 53. Baseboards must provide a matched power
header to support the boxed processor. Table 39 contains specifications for the input and output
signals at the fan heatsink connector. The cable length will be 7.0 ±0.25 inches. 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 baseboard pull-up resistor (~12 k
) provides V
OH to match the baseboard-
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 baseboard
documentation, or on the baseboard itself. Figure 53 shows the location of the fan power connector
relative to the 242-contact slot connector. The baseboard power header should be positioned within
4.75 inches (lateral) of the fan power connector.
Figure 53. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 39. Fan Heatsink Power and Signal Specifications
Description
Min
Typ
Max
+12 V: 12 volt fan power supply
9 V
12 V
13.8 V
IC: Fan current draw
100 mA
Ics: Fan sense signal current
10 mA
SENSE: SENSE frequency (baseboard should pull this
pin up to appropriate VCC with resistor)
2 pulses per
fan revolution
Pin
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.
1
2
3
GND
+12V
SENSE
12
3
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