參數(shù)資料
型號: LM64
廠商: National Semiconductor Corporation
元件分類: 溫度/濕度傳感器
英文描述: 【1∑C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s
中文描述: 【1ΣC遠(yuǎn)程二極管溫度傳感器,PWM風(fēng)扇控制和5個(gè)GPIO的
文件頁數(shù): 25/29頁
文件大?。?/td> 363K
代理商: LM64
3.0 Application Notes
3.1 FAN CONTROL DUTY CYCLE VS. REGISTER SETTINGS AND FREQUENCY
PWM
Freq
4D
[4:0]
Step
Resolution,
%
PWM
Value
4D [5:0]
for 100%
PWM
Value
4C [5:0] for
about 75%
PWM
Value
4C [5:0]
for 50%
PWM
Freq at
360 kHz
Internal
Clock, kHz
PWM
Freq at
1.4 kHz
Internal
Clock, Hz
Actual Duty
Cycle, % When
75% is Selected
0
1
2
3
4
5
6
7
8
9
Address 0 is mapped to Address 1
1
2
3
4
5
6
11
7
12
8
14
9
15
10
17
11
18
12
20
13
21
14
23
15
24
16
26
17
27
18
29
19
30
20
32
21
33
22
35
23
36
24
38
25
39
26
41
27
42
28
44
29
45
30
47
31
50
25
16.7
12.5
10.0
8.33
7.14
6.25
5.56
5.00
4.54
4.16
3.85
3.57
3.33
3.13
2.94
2.78
2.63
2.50
2.38
2.27
2.17
2.08
2.00
1.92
1.85
1.79
1.72
1.67
1.61
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
1
3
5
6
8
9
180.0
90.00
60.00
45.00
36.00
30.00
25.71
22.50
20.00
18.00
16.36
15.00
13.85
12.86
12.00
11.25
10.59
10.00
9.47
9.00
8.57
8.18
7.82
7.50
7.20
6.92
6.67
6.42
6.21
6.00
5.81
703.1
351.6
234.4
175.8
140.6
117.2
100.4
87.9
78.1
70.3
63.9
58.6
54.1
50.2
46.9
43.9
41.4
39.1
37.0
35.2
33.5
32.0
30.6
29.3
28.1
27.0
26.0
25.1
24.2
23.4
22.7
50.0
75.0
83.3
75.0
80.0
75.0
78.6
75.0
77.8
75.0
77.27
75.00
76.92
75.00
76.67
75.00
76.47
75.00
76.32
75.00
76.19
75.00
76.09
75.00
76.00
75.00
75.93
75.00
75.86
75.00
75.81
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3.1.1 Computing Duty Cycles for a Given Frequency
Select a PWM Frequency from the first column correspond-
ing to the desired actual frequency in columns 6 or 7. Note
the PWM Value for 100% Duty Cycle.
Find the Duty Cycle by taking the PWM Value of Register 4C
and computing:
Example: For a PWM Frequency of 24, a PWM Value at
100% = 48 and PWM Value actual = 28, then the Duty Cycle
is (28/48) x 100% =
58.3%
.
L
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