參數(shù)資料
型號(hào)： LM85
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： Hardware Monitor with Integrated Fan Control
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： QSOP-24
文件頁(yè)數(shù)： 18/26頁(yè)
文件大?。?/td> 261K
代理商： LM85
Functional Description
(Continued)
In Auto Fan Mode, when the temperature for a zone is above the Temperature Limit (Registers 67-69h) and below its Absolute
Temperature Limit (Registers 6A-6Ch), the speed of a fan assigned to that zone is determined as follows.
When the temperature reaches the Fan Temp Limit for a zone, the PWM output assigned to that zone will be Fan PWM Minimum.
Between Fan Temp Limit and (Fan Temp Limit + Range), the PWM duty cycle will increase linearly according to the temperature
as shown in the figure below. The PWM duty cycle will be 100% at (Fan Temp Limit + Range).
Example for PWM1 assigned to Zone 1:
– Zone 1 Fan Temp Limit (Register 67h) is set to 50C (32h).
– Range (Register 5Fh) is set to 8C (6xh).
– Fan 1 PWM Minimum (Register 64h) is set to 50% (32h).
In this case, the PWM1 duty cycle will be 50% at 50C.
Since (Zone 1 Fan Temp Limit) + (Zone 1 Range) = 50C + 8C = 58C, the fan will run at 100% duty cycle when the temperature
of the Zone 1 sensor reaches 58C.
Since the midpoint of the fan control range is 54C, and the median duty cycle is 75% (Halfway between the PWM Minimum and
100%), PWM1 duty cycle would be 75% at 54C.
Above (Zone 1 Fan Temp Limit) + (Zone 1 Range), the duty cycle will be 100%.
PWM frequency bits [3:0]
The PWM frequency bits [3:0] determine the PWM frequency for the fan.
PWM Frequency Selection (Default = 011 = 30.04 Hz)
TABLE 6. Register Setting vs PWM Frequency
Freq [2:0]
PWM Frequency (Exact frequencies vary by
manufacturer)
10 Hz
15 Hz
23 Hz
30 Hz
38 Hz
47 Hz
62 Hz
94 Hz
National Actual PWM Frequency
000
001
010
011
100
101
110
111
10.01 Hz
15.02 Hz
23.14 Hz
30.04 Hz
38.16 Hz
47.06 Hz
61.38 Hz
94.12 Hz
Range Selection RAN [3:0]
RAN [3:0]
0000
0001
0010
Range (C)
2
2.5
3.33
20035306
FIGURE 1. Fan Activity above Fan Temp Limit
L
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