W83627EHF データシートの表示（PDF） - Winbond

部品番号

コンポーネント説明

メーカー

W83627EHF

(W83627EHF / W83627EHG) LPC I/O

Winbond 

W83627EHF/EF, W83627EHG/EG

Temperature Tolerance), which is shown in Figure 6.10, fan speed jumps up to the next step.

“Step” here refers to the value in the CPUFANOUT Output Value Select Register, Bank0 Index03h

or Index61h.

(3) Meanwhile, original Target Temperature dynamically shifts to (Target Temperature ＋

Temperature Tolerance), and new Target Temperature, named Target Temperature 1, is formed.

In other words, Target Temperature 1 equals original Target Temperature plus Temperature

Tolerance.

(4) If the currently measured temperature is within the (Target Temperature 1 ± Temperature

Tolerance) then, the fan speed remains constant. Otherwise, fan speed jumps up to the next step

again. Target Temperature then dynamically shifts to (Target Temperature 1 ＋ Temperature

Tolerance), and new Target Temperature again, named Target Temperature 2, is formed.

(5) The fan-speed-up and Target Temperature comparison-then-shift process continue until currently

measured temperature locates within (Target Temperature X ± Temperature Tolerance), or fan

output speed reaches its maximum speed.

(6) Please be noted that “Speed-up Slope” shown in the Figure 6.10 must be an integer. In other

words, Max.FanOutput − InitialOutput must be an integer; otherwise, it may lead to register overflow.

Steps

(7) In the case that currently measured temperature goes below (Target Temperature － Temperature

Tolerance), which is shown in Figure 6.11, fan speed slows down by one step. “Step” here refers

to the value in the CPUFANOUT Output Value Select Register, Bank0 Index03h or Index61h.

(8) Meanwhile, original Target Temperature dynamically shifts to (Target Temperature －

Temperature Tolerance), and new Target Temperature, named Target Temperature 1, is formed.

In other words, Target Temperature 1 equals original Target Temperature minus Temperature

Tolerance.

(9) If the currently measured temperature is within the (Target Temperature 1 ± Temperature

Tolerance) then, the fan speed remains constant. Otherwise, fan speed slows down by one step

again. Target Temperature then dynamically shifts to (Target Temperature 1 － Temperature

Tolerance), and new Target Temperature again, named Target Temperature 2, is formed.

(10) The fan-slow-down and Target Temperature comparison-then-shift process continue until

currently measured temperature locates within (Target Temperature X ± Temperature Tolerance),

or fan output speed hits its minimum speed.

(11) Please be noted that “Speed-down Slope” shown in the Figure 6.11 must be an integer. In other

words, InitialOutput − Min.FanOutput must be an integer; otherwise, it may lead to register overflow.

Step

(12) In the case that the temperature is always lower than (Target Temperature X － Temperature

Tolerance), and, for some reason, the fan speed would like to be kept at the minimum speed, Stop

Value, instead of being stopped, set register Bank0 12h.bit 4. Set bit 4 to 1, fan speed will always

keep at the value set in Bank0 Index09h when temperature is always below (Target Temperature

X － Temperature Tolerance). Set bit 4 to 0, fan speed will decrease to 0 after a time period set in

Bank0 Index0Dh.

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Publication Release Date: Nov. 2006

Revision 1.3

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