- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376961 > DS1821 Programmable Digital Thermostat PDF資料下載
參數(shù)資料
| 型號(hào)： | DS1821 |
| 元件分類： | 溫度傳感器 |
| 英文描述： | Programmable Digital Thermostat |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 570K |
| 代理商： | DS1821 |
DS1821
2 of 16
DETAILED PIN DESCRIPTION
PIN
PR35
1
2
PIN
TO-220
2/TAB
3
PIN
8-PIN
SOIC
2
1
SYMBOL
GND
DQ
DESCRIPTION
Ground.
Data input/output pin
for 1-Wire
TM
programming
operation;
Thermostat output pin
in normal operation.
V
DD
pin. +5V nominal.
3
1
8
V
DD
DS1821S (8-pin SOIC): All pins not specified in this table are not to be connected.
OVERVIEW
The block diagram of Figure 1 shows the major components of the DS1821. The DS1821 has two
operating modes: 1-Wire
TM
and thermostat.
The part arrives from the factory in 1-Wire mode. In this mode, the DQ pin of the DS1821 is configured
as a 1-Wire communication port which would be connected to a microprocessor. The microprocessor will
write data into the high and low temperature trigger registers, TH and TL, respectively, to set up the
temperature limits for thermostat operation. In this mode, the result of the last temperature measurement
made by the DS1821 may also be read directly by the microprocessor.
Once temperature limits have been set and thermometer operation has been verified, the user may convert
the DS1821 from a temperature sensor into a thermostat by writing to a bit in the status register. The part
will then be configured for thermostat operation; this will also become the default power-up state for the
device on the subsequent power up.
In thermostat mode, the DQ line becomes the thermostat output. This open drain output will go to its
active state (programmable on/off) when the temperature of the DS1821 goes above the limit set in the
TH register, and will remain active until the temperature goes below the limit programmed into the TL
register.
If the user wishes to establish communications with the DS1821 once it has been placed in thermostat
mode (for example, to change temperature trip point limits), this may be done by dropping V
DD
while
holding the DQ line high, then clocking the DQ line 16 times. The part will then be placed into 1-Wire
mode, and will allow the I/O functions of the device to operate, and reads from or writes to the memory
are possible. This does not change the power-up state of the device, unless the user writes the
configuration bit to do so.
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: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。