Table 6.34 Fan Effective Duty Cycle Resolution and Frequency
EFFECTIVE
DUTY CYCLE
(AT 75%
EFFECTIVE
DUTY CYCLE
(AT 50%
PWM_F
[4:0]
SETTING
EFFECTIVE
RESOLUTION
(%)
FAN_SETTING
TO GET 75%
DUTY CYCLE
PWM FREQUENCY
AT 360KHZ BASE
FREQUENCY (KHZ)
PWM FREQUENCY
AT 1.4KHZ BASE
FREQUENCY (HZ)
FAN_SETTING)
FAN_SETTING)
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
Setting 00h is mapped to setting 01h
50.00
25.00%
16.67%
12.50%
10.00%
8.33%
7.14%
6.25%
5.56%
5.00%
4.54%
4.17%
3.84%
3.57%
3.33%
3.13
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
94.1%
88.9%
84.2%
01h (50%)
03h (75%)
04h (66.7%)
06h (75%)
07h (70%)
09h (75%)
0Ah (71.4%)
0Ch (75%)
0Dh (72.5)
0Fh (75%)
11h (77.3%)
12h (75%)
14h (76.9%)
15h (75%)
16h (73.3%)
18h (75.0%)
19h (73.5%)
1Bh (75.0%)
1Ch (73.7%)
180.0
90.0
60.0
45.0
36.0
30.0
25.7
22.5
20.0
18.0
16.4
15.0
13.8
12.8
12.0
11.25
10.68
10.00
9.47
704.2
350.0
233.3
175.0
140.0
116.7
100.0
87.5
77.8
70.0
63.7
58.3
53.8
50.0
46.7
44.0
2.94
41.4
2.78
39.1
2.63
37.1