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參數(shù)資料
| 型號： | LM85 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Hardware Monitor with Integrated Fan Control |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | QSOP-24 |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LM85 |
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Functional Description
(Continued)
4.19 Registers 6A-6Ch: Absolute Temperature Limit
Register
Address
6Ah
6Bh
6Ch
Read/
Write
R/W
R/W
R/W
Register
Name
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
64h
64h
64h
Lock
Zone1 Absolute Temp Limit
Zone2 Absolute Temp Limit
Zone3 Absolute Temp Limit
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
U
U
U
For the LM85B in the Auto Fan mode, if a zone exceeds the temperature set in the Absolute Temperature Limit register, all of the
PWM outputs will incresase its duty cycle to 100%. This is a safety feature that attempts to cool the system if there is a potentially
catastrophic thermal event. If set to 80h (-128C), the feature is disabled. Default=100C=64h
For the LM85C in the Auto Fan mode, if a zone exceeds the temperature set in the Absolute Temperature Limit register, only the
PWM output associated with the Absolute Temperature Limit will go to 100%.
These registers become Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
these registers shall have no effect. After power up the default values are used whenever the Ready/Lock/Start/Override register
Start bit is cleared even though modifications to these registers are possible.
TABLE 11. Absolute Limit vs Register Setting
Temperature
127C
.
.
.
50C
.
.
.
0C
.
.
.
50C
.
.
.
127C
Reading (Decimal)
127
.
.
.
50
.
.
.
0
.
.
.
50
.
.
.
127
Reading (Hex)
81h
.
.
.
CEh
.
.
.
00h
.
.
.
32h
.
.
.
7Fh
4.20 Registers 6D-6Eh: Zone Hysteresis Registers
Register
Address
6Dh
6Eh
Read/
Write
R/W
R/W
Register
Name
Zone1 and Zone2 Hysteresis
Zone3 Hysteresis
Bit 7
(MSB)
H1-3
H3-3
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
H2-0
RES
Default
Value
44h
40h
Lock
H1-2
H3-2
H1-1
H3-1
H1-0
H3-0
H2-3
RES
H2-2
RES
H2-1
RES
U
U
If the temperature is above Fan Temp Limit, then drops below Fan Temp Limit, the following will occur:
– The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below Fan Temp Limit.
– The Hysteresis registers control this amount. See below table for details.
These registers become Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
thses registers 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 12. Hysteresis Settings
Setting
0h
HYSTERESIS
0C
L
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