參數(shù)資料
型號: LM86BIMQX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封裝: QSOP-24
文件頁數(shù): 10/26頁
文件大小: 261K
代理商: LM86BIMQX
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)
National Actual PWM Frequency
000
10 Hz
10.01 Hz
001
15 Hz
15.02 Hz
010
23 Hz
23.14 Hz
011
30 Hz
30.04 Hz
100
38 Hz
38.16 Hz
101
47 Hz
47.06 Hz
110
62 Hz
61.38 Hz
111
94 Hz
94.12 Hz
Range Selection RAN [3:0]
RAN [3:0]
Range (C)
0000
2
0001
2.5
0010
3.33
20035306
FIGURE 1. Fan Activity above Fan Temp Limit
LM85
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相關(guān)PDF資料
PDF描述
LM85BIMQ/NOPB SPECIALTY ANALOG CIRCUIT, PDSO24
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