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參數(shù)資料
| 型號： | DS1821 |
| 元件分類： | 溫度傳感器 |
| 英文描述： | Programmable Digital Thermostat |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 570K |
| 代理商： | DS1821 |
DS1821
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A status register is also present, indicating the status of the thermostatic control, and allowing
configuration of the output polarity as either active high or active low, and establishes the power-up state
of the device.
The status register is defined as follows:
where,
DONE = Conversion Done bit. 1 = Conversion complete, 0 = conversion in progress.
THF
exceeds the value of TH. It will remain 1 until reset by writing 0 into this location. This feature provides a
method of determining if the DS1821 has ever been subjected to temperatures above TH. This bit is
nonvolatile, and is stored in E
2
memory.
= Temperature High Flag. This bit will normally be 0, but will be set to 1 when the temperature
TLF
is lower than the value of TL. It will remain 1 until reset by writing 0 into this location. This feature
provides a method of determining if the DS1821 has ever been subjected to temperatures below TL. This
bit is nonvolatile, and is stored in E
2
memory.
= Temperature Low Flag. This bit will normally be 0, but will be set to 1 when the temperature
NVB
memory is not busy. A write to E
2
may take up to 10 ms.
= Nonvolatile memory busy flag. 1 = Write to an E
2
memory cell in progress, 0 = nonvolatile
T/R*
0, the device will power up in 1-Wire “read” mode. This bit is nonvolatile.
= Power-up mode bit. If set to a 1, the DS1821 will power up in a thermostat mode. If set to a
POL
= Output Polarity Bit. 1 = active high, 0 = active low. This bit is nonvolatile.
1SHOT = One-Shot Mode. If 1SHOT is 1, the DS1821 will perform one temperature conversion upon
reception of the Start Convert T protocol. If 1SHOT is 0, the DS1821 will continuously perform
temperature conversions. Note that the One-Shot mode is available only when the device is in 1-Wire
mode. In thermostat mode, the device continuously performs temperature conversions. This bit is
nonvolatile.
DONE
1
NVB
THF
TLF
T/R
POL
1SHOT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1830 | Reset Sequence Pushbutton |
| DS1830A | Reset Sequence Pushbutton |
| DS1830AS | Reset Sequence Pushbutton |
| DS1830AU | Reset Sequence Pushbutton |
| DS1830U | Reset Sequence Pushbutton |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1821_07 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Programmable Digital Thermostat and Thermometer |
| DS1821+ | 功能描述:板上安裝溫度傳感器 Programmable Digital Thermostat/Thrmmtr RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| DS1821C+ | 功能描述:恒溫器 Programmable Digital Thermo-stat/monitor RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準(zhǔn)確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產(chǎn)品:Thermostats |
| DS1821-C02 | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| DS1821-C04 | 制造商:DSC 功能描述: |
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