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LM63 Datasheet(PDF) 29 Page - Texas Instruments

No. de pieza LM63
Descripción Electrónicos  LM63 ±1°C/±3°C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control
PDF  44 Pages
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Fabricante Electrónico  TI2 [Texas Instruments]
Página de inicio  https://www.ti.com
Logo TI2 - Texas Instruments

LM63 Datasheet(HTML) 29 Page - Texas Instruments

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%
100
%
100
_
_
_
_
_(%)
u
=
for
Value
PWM
Value
PWM
DutyCycle
LM63
www.ti.com
SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013
APPLICATION NOTES
FAN CONTROL DUTY CYCLE VS. REGISTER SETTINGS AND FREQUENCY
ACTUAL
PWM
PWM
PWM
PWM
PWM
DUTY
PWM
STEP
FREQ AT
FREQ AT
VALUE
VALUE
VALUE
CYCLE, %
FREQ
RESOLUTION,
360 kHz
1.4 kHz
4D [5:0]
4C [5:0] FOR
4C [5:0]
WHEN
4D [4:0]
%
INTERNAL
INTERNAL
FOR 100%
ABOUT 75%
FOR 50%
75% IS
CLOCK, kHz
CLOCK, Hz
SELECTED
0
Address 0 is mapped to Address 1
1
50
2
1
1
180.0
703.1
50.0
2
25
4
3
2
90.00
351.6
75.0
3
16.7
6
5
3
60.00
234.4
83.3
4
12.5
8
6
4
45.00
175.8
75.0
5
10.0
10
8
5
36.00
140.6
80.0
6
8.33
12
9
6
30.00
117.2
75.0
7
7.14
14
11
7
25.71
100.4
78.6
8
6.25
16
12
8
22.50
87.9
75.0
9
5.56
18
14
9
20.00
78.1
77.8
10
5.00
20
15
10
18.00
70.3
75.0
11
4.54
22
17
11
16.36
63.9
77.27
12
4.16
24
18
12
15.00
58.6
75.00
13
3.85
26
20
13
13.85
54.1
76.92
14
3.57
28
21
14
12.86
50.2
75.00
15
3.33
30
23
15
12.00
46.9
76.67
16
3.13
32
24
16
11.25
43.9
75.00
17
2.94
34
26
17
10.59
41.4
76.47
18
2.78
36
27
18
10.00
39.1
75.00
19
2.63
38
29
19
9.47
37.0
76.32
20
2.50
40
30
20
9.00
35.2
75.00
21
2.38
42
32
21
8.57
33.5
76.19
22
2.27
44
33
22
8.18
32.0
75.00
23
2.17
46
35
23
7.82
30.6
76.09
24
2.08
48
36
24
7.50
29.3
75.00
25
2.00
50
38
25
7.20
28.1
76.00
26
1.92
52
39
26
6.92
27.0
75.00
27
1.85
54
41
27
6.67
26.0
75.93
28
1.79
56
42
28
6.42
25.1
75.00
29
1.72
58
44
29
6.21
24.2
75.86
30
1.67
60
45
30
6.00
23.4
75.00
31
1.61
62
47
31
5.81
22.7
75.81
COMPUTING DUTY CYCLES FOR A GIVEN FREQUENCY
Select a PWM Frequency from the first column corresponding 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:
(1)
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) × 100% = 58.3%.
Copyright © 2002–2013, Texas Instruments Incorporated
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