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參數資料
| 型號： | LM81CIMTX-32 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Serial Interface ACPI-Compatible Microprocessor System |
| 中文描述： | 串行接口ACPI的兼容微處理器系統 |
| 文件頁數： | 18/32頁 |
| 文件大小： | 412K |
| 代理商： | LM81CIMTX-32 |
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Functional Description
(Continued)
8.0 TEMPERATURE MEASUREMENT SYSTEM
The LM81 temperature sensor and ADC produce 9-bit or
12-bit two’s-complement temperature data. A digital com-
parator
compares
the
temperature
user-programmable High, Low, Critical setpoints and Hyster-
esis values.
data
to
the
8.1 Temperature Data Format
Temperature data can be read from the Temperature, T
setpoint, T
setpoint, T
setpoint, T
C
setpoint and
T
HYST
Offset registers; and written to the T
setpoint,
T
, T
LOW
setpoint, T_CRIT setpoint and T
offset
registers. T
setpoint, T
setpoint, T_CRIT setpoint
temperature data is represented by an 8-bit, two’s comple-
ment word with an LSB (Least Significant Bit) equal to 1C:
Temperature
Digital Output
Binary
0111 1101
0001 1001
0000 0001
0000 0000
1111 1111
1110 0111
1100 1001
Hex
7Dh
19h
01h
00h
FFh
E7h
C9h
+125C
+25C
+1.0C
+0C
1.0C
25C
55C
By default Temperature Register data is represented by a
9-bit two’s complement digital word with the LSB having a
resolution of 0.5C:
Temperature
Digital Output
Binary
0 1111 1010
0 0011 0010
0 0000 0011
0 0000 0000
1 1111 1111
1 1100 1110
1 1001 0010
Hex
0 FAh
0 32h
0 03h
0 00h
1 FFh
1 CEh
1 92h
+125C
+25C
+1.5C
+0C
0.5C
25C
55C
In the extended mode temperature Register data can also be
represented by a 12-bit two’s complement digital word with
an LSB of 0.0625C:
Temperature
Digital Output
Binary
0111 1100 0000
0001 1001 0000
0000 0001 0000
0000 0000 0001
0000 0000 0000
1111 1111 1111
1111 1111 0000
1110 0111 0000
1100 1001 0000
Hex
7 D0h
1 90h
0 10h
0 01h
0 00h
F FFh
F F0h
E 70h
C 90h
+125C
+25C
+1.0C
+0.0625C
0C
0.0625C
1.0C
25C
55C
T
Offset temperature data is represented by a 3-bit word
with an LSB (Least Significant Bit) equal to 1C.
DS100072-24
(Non-Linear Scale for Clarity)
FIGURE 9. 9-bit Temperature-to-Digital Transfer
Function
DS100072-27
(Non-Linear Scale for Clarity)
FIGURE 10. 12-bit Temperature-to-Digital Transfer
Function
www.national.com
18
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