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參數資料
型號: LM79CCVF
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 模擬信號調理
英文描述: Microprocessor System Hardware Monitor
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP44
封裝: 10 X 10 MM, PLASTIC, QFP-44
文件頁數: 19/31頁
文件大小: 481K
代理商: LM79CCVF
Functional Description
(Continued)
Counts are based on 2 pulses per revolution tachometer outputs.
RPM
Time per Revolution
Counts for “Divide by 2”
(Default) in Decimal
153 counts
219 counts
255 counts
(maximum counts)
Comments
4400
3080
2640
13.64 ms
19.48 ms
22.73 ms
Typical RPM
70% RPM
60% RPM
Mode Select
Nominal
RPM
Time per Revolution
Counts for the
70%
RPM
Time per Revolution
Given Speed in Decimal
153
153
153
153
for 70% RPM
9.74 ms
19.48 ms
38.96 ms
77.92 ms
Divide by 1
Divide by 2
Divide by 4
Divide by 8
8800
4400
2200
1100
6.82 ms
13.64 ms
27.27 ms
54.54 ms
6160
3080
1540
770
DS100036-14
(a) Fan with Tach Pull-Up to +5V
DS100036-15
(b) Fan with Tach Pull-Up to +12V, or Totem-Pole
Output and Resistor Attenuator
DS100036-16
(c) Fan with Tach Pull-Up to +12V and Diode Clamp
DS100036-17
(d) Fan with Strong Tach Pull-Up or Totem Pole Output
and Diode Clamp
FIGURE 9. Alternatives for Fan Inputs
L
www.national.com
19
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