參數(shù)資料
型號(hào)： LM93CIMT
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： Hardware Monitor with Integrated Fan Control for Server Management
中文描述： 16-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO56
封裝： MO-153EE, TSSOP-56
文件頁(yè)數(shù)： 30/92頁(yè)
文件大?。?/td> 654K
代理商： LM93CIMT
15.0 Using The LM93
(Continued)
Zone 1/2 (CPU1 and CPU2) Table
In this example: Zones 1 and 2 are bound to the PWM1 output and the PWM1 frequency set to a value in the low range;
Hysteresis is set to 2C; Toffset and hysteresis resolution is set to 0.5C; minPWM register set to 05h for Zones 1/2. Note,
the duty cycle assignment depends on the zone to PWM output binding and the frequency setting of that PWM output.
Lookup
Table
Duty Cycle
(%)
Zone 1/2
Toffset
table
(C)
Tbase
CPU1,
Zone1
(C)
70
CPU1 Thermal Diode, Zone 1
(T
D
)
(C)
T
D
<
Tbase
CPU2,
Zone2
(C)
60
CPU2 Thermal Diode, Zone 2
(T
D
)
(C)
T
D
<
(C)
(C)
70
60
25
0
0
0
0
0
28.57
32.14
35.71
39.29
42.86
46.43
50
53.57
57.14
71.43
85.71
100
0.5
1.5
2
0
1
1.5
1.5
70
≤
T
D
<
≤
T
D
<
≤
T
D
<
70.5
72
74
60
≤
T
D
<
≤
T
D
<
≤
T
D
<
60.5
62
64
70.5
72
60.5
62
74
75
≤
T
D
<
≤
T
D
<
≤
T
D
<
≤
T
D
75
76.5
78
64
65
≤
T
D
<
≤
T
D
<
≤
T
D
<
≤
T
D
65
66.5
68
76.5
78
66.5
68
Zone 3/4 (LM93 Ambient and External Ambient) Table
In this example: Zone 3 and Zone 4 are bound to the PWM 2 output and the PWM2 output frequency set to 22.5kHz; Hys-
teresis is set to 1C; Toffset and hysteresis resolution set to 0.5C; minPWM for Zones 3/4 register is set to 06h. Note, the
duty cycle assignment depends on the zone to PWM output binding and the frequency setting of that PWM output.
Lookup
Table
Duty Cycle
(%)
Zone 3/4
Toffset
table
(C)
Tbase
LM93
Ambient
(C)
30
LM93 Ambient, Zone 3 (T
A
)
(C)
T
A
<
Tbase
External
Ambient
(C)
35
External Ambient, Zone 4 (T
A
)
(C)
T
A
<
(C)
(C)
30
35
25
0
0
0
0
0
0
1
1
1
31.25
37.5
43.75
50
56.25
62.5
68.75
75
81.25
87.5
93.75
100
30
31
32
33
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
31
32
33
33.5
34
34.5
35
36
37
38
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
<
≤
T
A
36
37
38
38.5
39
39.5
0.5
0.5
0.5
33.5
34
34.5
38.5
39
39.5
15.10.2 Fan Control Temperature Resolution
As shown in the example the auto fan control algorithm can
operate in a mode that allows 0.5C of temperature resolu-
tion instead of the normal 1C. When this mode is enabled,
the temperature offset registers that make up the lookup
table are interpreted differently. One LSB represents 0.5C,
and the available range between each datapoint is 0C to
7.5C instead of 0C to 15C. In addition, the hysteresis
registers for auto fan control are interpreted in the same way
(one LSB equals 0.5C).
Zones 1, 2 and 3 all have 9-bits of internal resolution, which
makes this feature useful. Zone 4 is written in from the
SMBus and only has 8-bits of resolution. The LM93 left
justifies the value into a 9-bit field before using it, if the 0.5C
mode is enabled.
L
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