LM85 National Semiconductor, LM85 Datasheet - Page 9
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LM85
Manufacturer Part Number
LM85
Description
Hardware Monitor with Integrated Fan Control
Manufacturer
National Semiconductor
Datasheet
1.LM85.pdf
(26 pages)
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Register
Address
49h
4Ah
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
53h
54h
55h
56h
57h
58h
59h
5Ah
5Bh
5Ch
5Dh
5Eh
5Fh
60h
61h
62h
63h
64h
65h
66h
67h
68h
69h
6Ah
6Bh
6Ch
6Dh
6Eh
Functional Description
Read/
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Register
Name
3.3V High Limit
5V Low Limit
5V High Limit
12V Low Limit
12V High Limit
Processor (Zone1) Low
Temp
Processor (Zone1) High
Temp
Internal (Zone2) Low
Temp
Internal (Zone2) High
Temp
Remote (Zone3) Low
Temp
Remote (Zone3) High
Temp
Tach1 Minimum LSB
Tach1 Minimum MSB
Tach2 Minimum LSB
Tach2 Minimum MSB
Tach3 Minimum LSB
Tach3 Minimum MSB
Tach4 Minimum LSB
Tach4 Minimum MSB
Fan1 Configuration
Fan2 Configuration
Fan3 Configuration
Fan1 Range/Frequency
Fan2 Range/Frequency
Fan3 Range/Frequency
Min/Off, Zone1 Spike
Smoothing
Zone2, Zone3 Spike
Smoothing
Fan1 PWM Minimum
Fan2 PWM Minimum
Fan3 PWM Minimum
Zone1 Fan Temp Limit
Zone2 Fan Temp Limit
Zone3 Fan Temp Limit
Zone1 Temp Absolute
Limit
Zone2 Temp Absolute
Limit
Zone3 Temp Absolute
Limit
Zone1, Zone2 Hysteresis
Zone3 Hysteresis
(Continued)
(MSB)
ZON2 ZON1 ZON0
ZON2 ZON1 ZON0
ZON2 ZON1 ZON0
RAN3 RAN2 RAN1 RAN0
RAN3 RAN2 RAN1 RAN0
RAN3 RAN2 RAN1 RAN0
OFF3 OFF2 OFF1 RES
ZN2E ZN2-2 ZN2-1 ZN2-0 ZN3E
Bit 7
H1-3
H3-3
15
15
15
15
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
Bit 6
H1-2
H3-2
14
14
14
14
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
Bit 5
H1-1
H3-1
13
13
13
13
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
9
Bit 4
H1-0
H3-0
INV
INV
INV
12
12
12
12
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
ZN1E
Bit 3
RES
RES
RES
RES
RES
RES
H2-3
RES
11
11
11
11
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
SPIN2
SPIN2
SPIN2
FRQ2
FRQ2
FRQ2
ZN1-2
ZN3-2
Bit 2
H2-2
RES
10
10
10
10
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
SPIN1
SPIN1
SPIN1
FRQ1
FRQ1
FRQ1
ZN1-1
ZN3-1
Bit 1
H2-1
RES
1
1
1
1
1
1
1
1
1
1
1
1
9
1
9
1
9
1
9
1
1
1
1
1
1
1
1
1
SPIN0
SPIN0
SPIN0
ZN1-0
ZN3-0
(LSB)
FRQ0
FRQ0
FRQ0
Bit 0
H2-0
RES
0
0
0
0
0
0
0
0
0
0
0
0
8
0
8
0
8
0
8
0
0
0
0
0
0
0
0
0
Default
Value
FFh
FFh
FFh
7Fh
7Fh
7Fh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
C4h
C4h
C4h
00H
5Ah
5Ah
5Ah
00h
00h
81h
81h
81h
62h
62h
62h
00h
80h
80h
80h
64h
64h
64h
44h
40h
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