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參數(shù)資料
| 型號： | LM71 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/MICROWIRE⑩ 13-Bit Plus Sign Temperature Sensor |
| 中文描述： | 的SPI / MICROWIRE的⑩13位帶符號溫度傳感器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LM71 |
1.0 Functional Description
(Continued)
1.3 TEMPERATURE DATA FORMAT
Temperature data is represented by a 14-bit, two’s comple-
ment word with an LSB (Least Significant Bit) equal to
0.03125C:
Temperature
Digital Output
Binary
0100 1011 0000 0011
0011 1110 1000 0011
0000 1100 1000 0011
0000 0000 0000 0111
0000 0000 0000 0011
1111 1111 1111 1111
1111 0011 1000 0011
1110 1100 0000 0011
Hex
4B03
3E83
0C83
0007
0003
FFFF
F383
EC03
+150C
+125C
+25C
+0.03125C
0C
0.03125C
25C
40C
The first data byte is the most significant byte with most
significant bit first, permitting only as much data as neces-
sary to be read to determine temperature condition. For
instance, if the first four bits of the temperature data indicate
an overtemperature condition, the host processor could im-
mediately take action to remedy the excessive tempera-
tures.
1.4 SHUTDOWN MODE/MANUFACTURER’S ID
Shutdown mode is enabled by writing XX FF to the LM71 as
shown in
Figure 7
c. The serial bus is still active when the
LM71 is in shutdown. When in shutdown mode the LM71
always will output 1000 0000 0000 1111. This is the
manufacturer’s/Device ID information. The first 5-bits of the
field (1000 0XXX) are reserved for manufacturer’s ID.
1.5 INTERNAL REGISTER STRUCTURE
The LM71 has three registers, the temperature register, the
configuration register and the manufacturer’s/device identifi-
cation register. The temperature and manufacturer’s/device
identification registers are read only. The configuration reg-
ister is write only.
1.5.1 Configuration Register
(Selects shutdown or continuous conversion modes):
(Write Only):
D15
X
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
D6
D5
D4
Shutdown
D3
D2
D1
D0
D0–D15 set to XX FF hex enables shutdown mode.
D0–D15 set to 00 00 hex sets Continuous conversion mode.
Note: setting D0-D15 to any other values may place the LM70 into a manufacturer’s test mode, upon which the LM71 will stop
responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2
Serial Bus Interface for a complete discussion.
1.5.2 Temperature Register
(Read Only):
D15
MSB
D14
Bit 12
D13
Bit 11
D12
Bit 10
D11
Bit 9
D10
Bit 8
D9
Bit 7
D8
Bit 6
D7
Bit 5
D6
Bit 4
D5
Bit 3
D4
Bit 2
D3
Bit1
D2
LSB
D1
1
D0
1
D0–D1: Logic 1 will be output on SI/0.
D2–D15: Temperature Data. One LSB = 0.03125C. Two’s complement format.
1.5.3 Manufacturer/Device ID Register
(Read Only):
D15
1
D14
0
D13
0
D12
0
D11
0
D10
0
D9
0
D8
0
D7
0
D6
0
D5
0
D4
0
D3
1
D2
1
D1
1
D0
1
D0–D1: Logic 1 will be output on SI/0.
D2–D15: Manufacturer’s/Device ID Data. This register is accessed whenever the LM71 is in shutdown mode.
L
www.national.com
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