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參數(shù)資料
| 型號(hào)： | LM73CIMKX |
| 廠商： | National Semiconductor Corporation |
| 元件分類(lèi)： | 溫度/濕度傳感器 |
| 英文描述： | 2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface |
| 中文描述： | 為2.7V，采用SOT - 23，11至14位數(shù)字溫度傳感器，2線接口 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 722K |
| 代理商： | LM73CIMKX |
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1.0 Functional Description
(Continued)
13-bit (12-bit plus sign)
Temperature
Digital Output
Binary
0100 1011 0000 0000
0000 1100 1000 0000
0000 0000 1000 0000
0000 0000 0000 1000
0000 0000 0000 0000
1111 1111 1111 1000
1111 1111 1000 0000
1111 0011 1000 0000
1110 1100 0000 0000
Hex
4B00h
0C80h
0080h
0008h
0000h
FFF8h
FF80h
F380h
EC00h
+150C
+25C
+1C
+0.0625C
0C
0.0625C
1C
25C
40C
14-bit (13-bit plus sign)
Temperature
Digital Output
Binary
0100 1011 0000 0000
0000 1100 1000 0000
0000 0000 1000 0000
0000 0000 0000 0100
0000 0000 0000 0000
1111 1111 1111 1100
1111 1111 1000 0000
1111 0011 1000 0000
1110 1100 0000 0000
Hex
4B00h
0C80h
0080h
0004h
0000h
FFFCh
FF80h
F380h
EC00h
+150C
+25C
+1C
+0.03125C
0C
0.03125C
1C
25C
40C
1.4 SMBus INTERFACE
The LM73 operates as a slave on the SMBus. The SMBDAT
line is bidirectional. The SMBCLK line is is an input only. The
LM73 never drives the SMBCLK line and it does not support
clock stretching.
The LM73 uses a 7-bit slave address. It is available in two
versions. Each version can be configured for one of three
unique slave addresses, for a total of six unique address.
Part Number
Address Pin
Float
Ground
V
DD
Float
Ground
V
DD
Device
Address
1001 000
1001 001
1001 010
1001 100
1001 101
1001 110
LM73-0
LM73-1
The SMBDAT output is an open-drain output and does not
have internal pull-ups. A “high” level will not be observed on
this pin until pull-up current is provided by some external
source, typically a pull-up resistor. Choice of resistor value
depends on many system factors but, in general, the pull-up
resistor should be as large as possible without effecting the
SMBus desired data rate. This will minimize any internal
temperature reading errors due to internal heating of the
LM73.
The LM73 features an integrated low-pass filter on both the
SMBCLK and the SMBDAT line. These filters increase com-
munications reliability in noisy environments.
If either the SMBCLK or SMBDAT line is held low for a time
greater than t
(see Logic Electrical Characteristics
for the value of t
TIMEOUT
), the LM73 state machine will reset
to the SMBus idle state, releasing the data line. Once the
SMBDAT is released high, the master may initiate an SMBus
start.
1.5 ALERT FUNCTION
The ALERT output is an over-temperature indicator. At the
end of every temperature conversion, the measured tem-
perature is compared to the value in the T
HIGH
Register. If
the measured temperature exceeds the value stored in
T
, the ALERT output goes active (see Figure
Figure 1
).
This over-temperature condition will also cause the ALRT-
_STAT bit in the Control/Status Register to change value
(this bit mirrors the logic level of the ALERT pin).
The ALERT pin and the ALRT_STAT bit are cleared when
any of the following occur:
1.
The measured temperature falls below the value stored
in the T
LOW
Register
2.
A "1" is written to the ALERT Reset bit in the Configura-
tion Register
3.
The master resets it through an SMBus Alert Response
Address (ARA) procedure
If ALERT has been cleared by the master writing a "1" to the
ALERT Reset bit, while the measured temperature still ex-
ceeds the T
setpoint, ALERT will go active again after
the completion of the next temperature conversion.
Each temperature reading is associated with a Temperature
High (THI) and a Temperature Low (TLOW) flag in the
Control/Status Register. A digital comparison determines
whether that reading is above the T
HIGH
setpoint or below
the T
LOW
setpoint. If so, the corresponding flag is set. All
digital comparisons to the T
HIGH
, and T
LOW
values are based
on an 11-bit temperature comparison. Regardless of the
resolution setting of the LM73, the lower three temperature
LSBs will not affect the state of the ALERT output, THI flag,
and TLOW flag.
L
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM73CIMKX-0 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface |
| LM73CIMKX-0 S7002130 | 制造商:Texas Instruments 功能描述: |
| LM73CIMKX-0/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM73CIMKX-1 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:2.7V, SOT-23, 11-to-14 Bit Digital Temperature Sensor with 2-Wire Interface |
| LM73CIMKX-1/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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