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參數(shù)資料
| 型號(hào)： | LM40CIMT/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | MO-153AB, TSSOP-14 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LM40CIMT/NOPB |
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2.0 Register Set (Continued)
2.9.3 Temperature Data Readout (Addr: 001 001; 09h)
Reg
Add
Register
Name
R/
W
P
O
R
Val
Bit
15
MSb
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
LSb
001 001
Local
Temperature
Data
Readout
R
MSb
Sign
128
C
64C 32C 16C 8C
4C
2C
1C
0.5
C
Reserved
SNUM
Reserved
00
Processor/
Remote
Temperature
Data
Readout
Reserved
EF
Res
00
0
Bit
Type
Description
0RO
Reserved. Will always read "0".
1RO
Reserved for Local Temperature Data Readout. Will always read "0".
EF (Error Flag) for Remote Temperature Data Readout. This bit indicates that an error was detected
during the measurement of the current remote Temperature sensor such as a diode fault condition. When a
diode fault occurs the value of the temperature reading will be 200h or -256C.
0: No error detected.
1: Error detected.
3-2
RO
SNUM (Sensor Number). This field indicates the number of the current Temperature Sensor, to which the
data in the Temperature Readout field belongs. Temperature Sensor 0 is always assigned to the local
sensor of the LM40.
0: Local temperature sensor (see Table Thermal Diode Input Mapping)
1-2: Remote sensor 1 and 2 (see Table Thermal Diode Input Mapping)
5-4
RO
Reserved. Will always read "0".
15-6
RO
Temperature Readout. This field holds the result of the temperature measurement. The active size of this
field for the LM40 is 10-bits, left justified. See Table Temperature Data Format for examples.
Thermal Diode Input Mapping
Sensor Number
(SNUM)
Sensor Input
Board Connection
0
Local
none
1
Processor, D1+/D1-
CPU Thermal Diode
2
Remote, D2+/D2-
MMBT3904 Thermal Diode or GPU
Thermal Diode
All LM40 temperature data has a common format. The LM40’s temperature data format is two’s complement and has 10-bits of
resolution with the LSb having a weight of 0.5 C. The LM40 can resolve temperature between +255.5 C and -256 C, inclusive.
It can measure local temperatures between +85 C and 0 C and remote temperatures between +125 C and 0 C with an
accuracy of ±3.0 C.
Temperature Data Format
Temperature
Binary
Hex
+140 C
01 0001 1000
118h
+100 C
00 1100 1000
0C8h
+1 C
00 0000 0010
002h
0 C
00 0000 0000
000h
- 0.5 C
11 1111 1111
3FFh
-1 C
11 1111 1110
3FEh
LM40
www.national.com
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