參數(shù)資料
型號(hào): LM96000
廠商: National Semiconductor Corporation
英文描述: Hardware Monitor with Integrated Fan Control
中文描述: 硬件監(jiān)控集成風(fēng)扇控制
文件頁數(shù): 22/28頁
文件大?。?/td> 695K
代理商: LM96000
Functional Description
(Continued)
4.17 Registers 64-66h: Minimum PWM Duty Cycle
Register
Address
64h
65h
66h
Read/
Write
R/W
R/W
R/W
Register
Name
Fan1 PWM Minimum
Fan2 PWM Minimum
Fan3 PWM Minimum
Bit 7
(MSB)
7
7
7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
0
0
0
Default
Value
80h
80h
80h
Lock
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
U
U
U
These registers specify the minimum duty cycle that the PWM will output when the measured temperature reaches the
Temperature LIMIT register setting.
This register becomes Read Only when the Ready/Lock/Start/Override register Lock bit is set.Any further attempts to write to this
register shall have no effect. After power up the default value is used whenever the Ready/Lock/Start/Override register Start bit
is cleared even though modifications to this register are possible.
TABLE 9. PWM Duty vs Register Setting for PWM Low Frequency Range
Current Duty
0%
0.3922%
.
.
.
25.098%
.
.
.
50.196%
.
.
.
100%
Value (Decimal)
0
1
.
.
.
64
.
.
.
128
.
.
.
255
Value (Hex)
00h
01h
.
.
.
40h
.
.
.
80h
.
.
.
FF
PWM Duty Cycle vs Register Setting for PWM High Frequency Range
22.5KHz PWM Frequency
PWM Duty Cycle
Level (%)
0.00
6.25
12.50
18.75
25.00
31.25
37.50
43.75
50.00
56.25
62.50
68.75
75.00
81.25
87.50
93.75
100.00
Value in Decimal
0
1 - 15
16 - 31
32 - 47
48 - 63
64 - 79
80 - 95
96 - 111
112 - 127
128 - 143
144 - 159
160 - 175
176 - 191
192 - 207
208 - 223
224 - 239
240 - 255
Value in Hex
0
01 - 0F
10 - 1F
20 - 2F
30 - 3F
40 - 4F
50 - 5F
60 - 6F
70 - 7F
80 - 8F
90 - 9F
A0 - AF
B0 - BF
C0 - CF
D0 - DF
E0 - EF
F0 - FF
24KHz PWM Frequency
PWM Duty Cycle
Level (%)
0
6.67
13.33
20.00
26.67
33.33
40.00
46.67
53.33
60.00
66.67
73.33
80.00
86.67
93.33
100.00
Value in Decimal
0
1 - 16
17 - 33
34 - 50
51 - 67
68 - 84
85 - 101
102 - 118
119 - 136
137 - 153
154 - 170
171 - 187
188 - 204
205 - 221
222 - 238
239 - 255
Value in Hex
0
01 - 10
11 - 21
22 - 32
33 - 43
44 - 54
55 - 65
66 - 76
77 - 88
89 - 99
9A - AA
AB - BB
BC - CC
CD - DD
DE - EE
EF - FF
L
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22
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