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AN2841 Datenblatt(PDF) 28 Page - STMicroelectronics

Teilenummer AN2841
Bauteilbeschribung  This application note deals with the general principles of LED dimming
PDF  31 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2841 Datenblatt(HTML) 28 Page - STMicroelectronics

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Achieved values
AN2841
28/31
536
124
62
31
15
8
544
122
61
30
15
8
552
120
60
30
15
8
560
119
59
30
15
7
568
117
59
29
15
7
576
116
58
29
14
7
584
114
57
29
14
7
592
113
56
28
14
7
600
111
56
28
14
7
608
110
55
27
14
7
616
110
55
27
14
7
624
110
55
27
14
7
632
106
53
26
13
7
640
105
52
26
13
7
648
103
52
26
13
6
656
102
51
26
13
6
664
101
51
25
13
6
672
100
50
25
12
6
680
99
49
25
12
6
688
98
49
24
12
6
1.
100 Hz can be reached with very high level of optimization.
Table 12.
Refresh frequencies for better optimized code (8- and 12-bit PWM)
LEDs
8-bit PWM freq. [Hz]
12-bit PWM freq. [Hz]
32
250 000 / 256 = 1000
250 000 / 4096 = 61
128
(250 000 / 256) / 4 = 244
(250 000 / 4096) / 4 = 15
512
(250 000 / 256) / 16 = 61
(250 000 / 4096) / 16 = 4
Table 13.
Refresh frequencies for better optimized code (10- and 11-bit PWM)
LEDs
10-bit PWM freq. [Hz]
11-bit PWM freq. [Hz]
32
250 000 / 1024 = 244
250 000 / 2048 = 122
128
(250 000 / 1024) / 4 = 64
(250 000 / 2048) / 4 = 30
512
(250 000 / 1024) /16 = 15
(250 000 / 2048) / 16 = 7
Table 11.
Refresh frequencies (continued)
LEDs/PWM
8-bit [Hz]
9-bit [Hz]
10-bit [Hz]
11-bit [Hz]
12-bit [Hz]
256
512
1024
2048
4096



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