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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)： | 10/26頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LM85 |
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Functional Description
(Continued)
Register
Address
6Fh
74h
75h
Read/
Write
R/W
R/W
R/W
Register
Name
XOR Test Tree Enable
Tach Monitor Mode
Fan Spin-up Mode
Bit 7
(MSB)
RES
RES
RES
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
XEN
T1-0
PWM1
SU
Default
Value
00h
00h
7h
Lock
RES
RES T3/4-1 T3/4-0
RES
RES
RES
RES
RES
T2-1
RES
RES
T2-0
PWM3
SU
RES
T1-1
PWM2
SU
U
RES
U
Note: Reserved bits will always return 0 when read.
4.1 Register 20-24h: Voltage Reading
Register
Address
20h
21h
22h
23h
24h
Read/
Write
R
R
R
R
R
Register
Name
2.5V
V
CCP
3.3V
5V
12V
Bit 7
(MSB)
7
7
7
7
7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
0
0
0
0
0
Default
Value
N/A
N/A
N/A
N/A
N/A
6
6
6
6
6
5
5
5
5
5
4
4
4
4
4
3
3
3
3
3
2
2
2
2
2
1
1
1
1
1
The Register Names difine the typical input voltage at which the reading is
3
4
full scale or C0h.
The Voltage Reading registers are updated automatically by the LM85 at a minimum frequency of 4 Hz. These registers are read
only — a write to these registers has no effect.
4.2 Register 25-27h: Temperature Reading
Register
Address
25h
26h
27h
Read/
Write
R
R
R
Register
Name
Processor (Zone1) Temp
Internal (Zone2) Temp
Remote (Zone3) Temp
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
N/A
N/A
N/A
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes. Processor (Zone1) Temp
register reports the temperature measured by the thermal diode connected to the Remote1 and Remote1+ pins, Remote
(Zone3) Temp register reports the temperature measured by the thermal diode connected to the the Remote2 and Remote2+
pins, and the Internal (Zone2) Temp register reports the temperature measured by the internal (junction) temperature sensor.
Temperatures are represented as 8 bit, 2’s complement, signed numbers, in Celsius, as shown below in
Table 1
. The Temperature
Reading register will return a value of 80h if the remote diode pins are not used by the board designer or are not functioning
properly. This reading will cause the zone limit bit(s) (bits 6 and 4) in the Interrupt Status Register (41h) and the remote diode fault
status bit(s) (bit 6 or 7) in the Interrupt Status Register 2 (42h) to be set. The Temperature Reading registers are updated
automatically by the LM85 at a minimum frequency of 4 Hz. These registers are read only — a write to these registers has no
effect.
TABLE 1. Temperature vs Register Reading
Temperature
127C
.
.
.
50C
.
.
.
0C
.
.
.
127C
Reading (Dec)
127
.
.
.
50
.
.
.
0
.
.
.
127
Reading (Hex)
81h
.
.
.
CEh
.
.
.
00h
.
.
.
7Fh
L
www.national.com
10
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