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參數(shù)資料
| 型號： | SE95 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Ultra high accuracy digital temperature sensor and thermal WatchdogE |
| 中文描述： | 超高精度數(shù)字溫度傳感器和熱WatchdogE |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 198K |
| 代理商： | SE95 |
Philips Semiconductors
Product data sheet
SE95
Ultra high accuracy digital temperature sensor and
thermal Watchdog
2004 Dec 21
12
Table 6. Temp table
Temp data
3-bit Hex
3F8h
3F7h
3F1h
3E8h
0C8h
001h
000h
7FFh
738h
649h
648h
Temp value
°
C
+127.000
°
C
+126.875
°
C
+126.125
°
C
+125.000
°
C
+25.000
°
C
+0.125
°
C
0.000
°
C
–0.125
°
C
–25.000
°
C
–54.875
°
C
–55.000
°
C
11–bit Binary (2’s complement)
0111 1111 000
0111 1110 111
0111 1110 001
0111 1101 000
0001 1001 000
0000 0000 001
0000 0000 000
1111 1111 111
1110 0111 000
11001001 001
1100 1001 000
Decimal value
1016
1015
1009
1000
200
1
0
–1
–200
–439
–440
Obviously, for 9-bit Temp data application in replacing the industry standard LM75, just use only 9 MSB bits of the two bytes and disregard
7 LSB bits of the LS byte. The 9-bit temp data with 0.5
°
C resolution of the SE95 is defined exactly in the same way as for the standard LM75
and it is here similar to the Tos and Thyst that is described next.
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 7) and Thyst register table (Table 8) 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 7. 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
X
X
X
X
X
X
Table 8. 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
X
X
X
X
X
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 9) shows examples of the limit data and value.
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