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參數(shù)資料
| 型號： | LM70 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/MICROWIRE⑩ 10-Bit plus Sign Digital Temperature Sensor |
| 中文描述： | 的SPI / MICROWIRE的⑩10位帶符號數(shù)字溫度傳感器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 285K |
| 代理商： | LM70 |
1.0 Functional Description
(Continued)
1.3 TEMPERATURE DATA FORMAT
Temperature data is represented by a 11-bit, two’s comple-
ment word with an LSB (Least Significant Bit) equal to
0.25C:
Temperature
Digital Output
Binary
0100 1011 0001 1111
0011 1110 1001 1111
0000 1100 1001 1111
0000 0000 0011 1111
0000 0000 0001 1111
1111 1111 1111 1111
1111 0011 1001 1111
1110 0100 1001 1111
Hex
4B 1Fh
3E 9Fh
0B 9Fh
00 3Fh
00 1Fh
FF FFh
F3 9Fh
E4 9Fh
+150C
+125C
+25C
+0.25C
0C
0.25C
25C
55C
Note: The last two bits are TRI-STATE and depicted as one
in the table.
The first data byte is the most significant byte with most sig-
nificant bit first, permitting only as much data as necessary to
be read to determine temperature condition. For instance, if
the first four bits of the temperature data indicate an over-
temperature condition, the host processor could immediately
take action to remedy the excessive temperatures.
1.4 SHUTDOWN MODE/MANUFACTURER’S ID
Shutdown mode is enabled by writing XX FF to the LM70 as
shown in Figure 7c and discussed in Section 1.2. The serial
bus is still active when the LM70 is in shutdown. Current
draw drops to less than 10 μA between serial communica-
tions. When in shutdown mode the LM70 always will output
1000 0001 0000 00XX. This is the manufacturer’s ID/Device
ID information. The first 5-bits of the field (1000 0XXX) are
reserved for manufacturer’s ID.
1.5 INTERNAL REGISTER STRUCTURE
The LM70 has three registers, the temperature register, the configuration register and the manufacturer’s/device identification
register. The temperature and manufacturer’s/device identification registers are read only. The configuration register is write only.
1.5.1 CONFIGURATION REGISTER
(Selects shutdown or continuous conversion modes):
(Write Only):
D15
X
D0-D15 set to XX FF hex enables shutdown mode.
D0-D15 set to XX 00 hex enables continuous conversion mode.
Note: setting D0-D15 to any other values may place the LM70 into a manufacturer’s test mode, upon which the LM70 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.
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
D6
D5
D4
Shutdown
D3
D2
D1
D0
1.5.2 TEMPERATURE REGISTER
(Read Only):
D15
D14
MSB
Bit 9
Bit 8
D0–D1: Undefined. TRI-STATE will be output on SI/0.
D13
D12
Bit 7
D11
Bit 6
D10
Bit 5
D9
Bit 4
D8
Bit 3
D7
Bit 2
D6
Bit 1
D5
LSB
D4
1
D3
1
D2
1
D1
X
D0
X
D2–D4: Always set high.
D5–D15: Temperature Data. One LSB = 0.25C. Two’s complement format.
1.5.3 MANUFACTURER’S/DEVICE ID REGISTER
(Read Only):
D15
D14
D13
1
0
0
D0–D1: Undefined. TRI-STATE will be output on SI/0.
D12
0
D11
0
D10
0
D9
0
D8
1
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
X
D0
X
D2-D4: Always set LOW.
D5–D15: Manufacturer’s ID Data. This register is accessed whenever the LM70 is in shutdown mode.
L
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