參數(shù)資料
型號(hào)： LM85
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)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)： 19/26頁
文件大小： 261K
代理商： LM85
Functional Description
(Continued)
RAN [3:0]
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Range (C)
4
5
6.67
8
10
13.33
16
20
26.67
32
40
53.33
80
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.
4.16 Registers 62, 63h: Min/Off, Spike Smoothing
Register
Address
62h
63h
Read/
Write
R/W
R/W
Register
Name
Min/Off, Zone1 Spike Smoothing OFF3
Zone2, Zone3 Spike Smoothing
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
OFF2
ZN2-2 ZN2-1 ZN2-0 ZN3E ZN3-2 ZN3-1 ZN3-0 00h
OFF1
RES
ZN1E ZN1-2 ZN1-1 ZN1-0 00h
U
ZN2E
U
The Off/Min Bits [7:5] specify whether the duty cycle will be 0% or Minimum Fan Duty when the measured temperature falls below
the Temperature LIMIT register setting (see table below). OFF1 applies to fan 1, OFF2 applies to fan 2, and OFF3 applies to fan
3.
If the Remote1 or Remote2 pins are connected to a processor or chipset, instantaneous temperature spikes may be sampled by
the LM85. If these spikes are not ignored, the CPU fan (if connected to LM85) may turn on prematurely and produce unpleasant
noise. For this reason, any zone that is connected to a chipset or processor should have spike smoothing enabled.
When spike smoothing is enabled, the temperature reading registers will still reflect the current value of the temperature — not
the ‘smoothed out’ value.
ZN1E, ZN2E, and ZN3E enable temperature smoothing for zones 1, 2, and 3 respectively.
ZN1-2, ZN1-1, and ZN1-0 control smoothing time for Zone 1.
ZN2-2, ZN2-1, and ZN2-0 control smoothing time for Zone 2.
ZN3-2, ZN3-1, and ZN3-0 control smoothing time for Zone 3.
These registers become ready only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
these registers shall have no effect.
L
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