參數(shù)資料
型號(hào)： LM86BIMQX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： QSOP-24
文件頁(yè)數(shù)： 15/26頁(yè)
文件大?。?/td> 261K
代理商： LM86BIMQX
Functional Description (Continued)
4.19 Registers 6A-6Ch: Absolute Temperature Limit
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock?
6Ah
R/W
Zone1 Absolute Temp Limit
7
654321
0
64h
U
6Bh
R/W
Zone2 Absolute Temp Limit
7
654321
0
64h
U
6Ch
R/W
Zone3 Absolute Temp Limit
7
654321
0
64h
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
Reading (Decimal)
Reading (Hex)
127C
127
81h
.
50C
50
CEh
.
0C
0
00h
.
50C
50
32h
.
127C
127
7Fh
4.20 Registers 6D-6Eh: Zone Hysteresis Registers
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock?
6Dh
R/W
Zone1 and Zone2 Hysteresis
H1-3
H1-2
H1-1
H1-0
H2-3
H2-2
H2-1
H2-0
44h
U
6Eh
R/W
Zone3 Hysteresis
H3-3
H3-2
H3-1
H3-0
RES
40h
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
HYSTERESIS
0h
0C
LM85
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相關(guān)PDF資料
PDF描述
LM85BIMQ/NOPB SPECIALTY ANALOG CIRCUIT, PDSO24
LM9140BYZ-5.0X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3
LM9140BYZ-4.1X 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3
LM9140BYZ-5.0 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3
LM9140BYZ-4.1 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 4.096 V, PBCY3
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