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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)： | 8/16頁 |
| 文件大小： | 570K |
| 代理商： | DS1821 |
DS1821
8 of 16
Example: CPU sets up DS1821 for low temp limit of +10
°
C and high temp limit of +40
°
C, output active
high (i.e., DQ pin is off), then instructs the DS1821 to become a thermostat.
DQ PORT PIN
DATA (LSB
FIRST)
Reset
Presence
01h
28h
Reset
Presence
02h
0Ah
Reset
Presence
A1h
28h
Reset
Presence
A2h
0Ah
Reset
Presence
0Ch
06h
COMMENTS
TX
RX
TX
TX
TX
RX
TX
TX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
TX
Reset pulse (480-960 μs).
Presence pulse.
CPU issues Write TH command.
CPU sends data for TH limit of +40°C.
Reset pulse (480-960 μs).
Presence pulse.
CPU issues Write TL command.
CPU sends data for TL limit of +10°C.
Reset pulse (480-960 μs).
Presence pulse.
CPU issues Read TH command.
DS1821 sends back stored value of TH for CPU to verify.
Reset pulse (480-960 μs).
Presence pulse.
CPU issues Read TL command.
DS1821 sends back stored value of TL for CPU to verify.
Reset pulse (480-960 μs).
Presence pulse.
CPU issues Write Config command.
CPU sets DS1821 up for active high output, set T/
R
bit to instruct
device to become thermostat.
Power cycles; DS1821 now comes up in thermostat mode.
<high impedance>
1-WIRE BUS SYSTEM
The DS1821 1-Wire bus is a system which has a single bus master and one slave. The DS1821 behaves as
a slave. The DS1821 is not able to be multidropped, unlike other 1-Wire devices from Dallas
Semiconductor.
The discussion of this bus system is broken down into three topics: hardware configuration, transaction
sequence, and 1-Wire signaling (signal types and timing).
HARDWARE CONFIGURATION
The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to
drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have open
drain or 3-state outputs. The 1-Wire port of the DS1821 (DQ pin) is open drain with an internal circuit
equivalent to that shown in Figure 4. The 1-Wire bus requires a pullup resistor of approximately 5K.
相關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 |
相關代理商/技術參數(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 關閉: 安裝風格: 封裝 / 箱體: 設備功能: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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS1821-C04 | 制造商:DSC 功能描述: |
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