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參數(shù)資料
| 型號： | 935269775118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT-96-1, SO-8 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 161K |
| 代理商： | 935269775118 |
Philips Semiconductors
Product data
LM75A
Digital temperature sensor and thermal Watchdog
2001 Jul 16
10
Overtemp shut-down threshold (Tos) and hysteresis (Thyst) registers
These two registers are write/read registers, and also called set-point registers. They are used to store the user-defined temperature limits,
called overtemp shut-down threshold (Tos) and hysteresis (Thyst), for the device Watchdog operation. At the end of each conversion the Temp
data will be compared with the data stored in these two registers in order to set the state of the device OS output accordingly as described in the
“General operation” section.
Each of the set-point registers contains two 8-bit data bytes consisting of one MS data byte and one LS data byte the same as the Temp
register. However, only 9 bits of the two bytes are used to store the set-point data in 2’s complement format with the resolution of 0.5
°C. The
Tos register table (Table 8) and Thyst register table (Table 9) show the bit arrangement of the Tos data and Thyst data in the data bytes.
Notice that because only 9-bit data are used in the set-point registers, the device uses only the 9 MSB bits of the Temp data for data
comparison.
Table 8. Tos register table
Tos MS byte
Tos LS byte
MSB
LSB
MSB
LSB
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
Tos data (9 bits)
Not used
MSB
LSB
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
Table 9. Thyst register table
Thyst MS byte
Thyst LS byte
MSB
LSB
MSB
LSB
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
Thyst data (9 bits)
Not used
MSB
LSB
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
When a set-point register is read, all 16 bits are provided to the bus and must be collected by the controller to complete the bus operation.
However, only the 9 significant bits should be used and the 7 LSB bits of the LS byte are equal to zero and should be ignored.
The Tos and Thyst table (Table 10) shows examples of the limit data and value.
Table 10. Tos and Thyst table
Limit data
Limit temp value
11–bit Binary (2’s complement)
3-bit Hex
Decimal value
°C
0111 1101 0
0FAh
250
+125.0
°C
0001 1001 0
032h
50
+25.0
°C
0000 0000 1
001h
1
+0.5
°C
0000 0000 0
000h
0
0.0
°C
1111 1111 1
1FFh
–1
–0.5
°C
1110 0111 0
1CEh
–50
–25.0
°C
1100 1001 0
192h
–110
–55.0
°C
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