參數(shù)資料
型號(hào)： DS1821
元件分類(lèi)： 溫度傳感器
英文描述： Programmable Digital Thermostat
文件頁(yè)數(shù)： 7/16頁(yè)
文件大?。?/td> 570K
代理商： DS1821
DS1821
7 of 16
RETURNING TO 1-WIRE MODE FROM THERMOSTAT MODE
The operating mode of the DS1821 is determined at power-up, depending upon the setting of the T/
R
bit.
If the T/
R
bit is set to a 1, the DS1821 will power up in thermostat mode. In this mode, the device cannot
be written to or read from over the DQ line. However, it is possible to return to the 1-Wire “read” mode
temporarily, in cases where thermostat limits may need to be changed after insertion and use in a system.
To return to the 1-Wire “read” mode, the V
DD
pin of the DS1821 is brought to 0V while the DQ line is
held high. The DQ line must then be clocked low 16 times. After this is accomplished, the V
DD
line may
be brought high again, and the DS1821 will then be in 1-Wire “read” mode.
To toggle between modes, V
DD
is brought low while DQ is held high and then clocked 16 times. When
V
DD
is brought high again, the part will then be in thermostat mode again. This technique may be used to
toggle between the two operating modes of the DS1821 as often as required.
When both V
DD
and DQ are low for more than approximately 10 seconds, the part is powered down.
When powered up again, the part will begin operating in the mode set by T/R* bit (1=thermostat mode,
0=“read” mode).
DS1821 COMMAND SET
Table 2
INSTRUCTION
DESCRIPTION
TEMPERATURE CONVERSION COMMANDS
Initiates temperature conversion.
Halts temperature conversion.
Reads last converted temperature value
from temperature register.
THERMOSTAT COMMANDS
Writes high temperature limit value into
TH register.
Writes low temperature limit value into
TL register.
Reads stored value of high temperature
limit from TH register.
Reads stored value of low temperature
limit from TL register.
Writes configuration data to
configuration register.
Reads configuration data from
configuration register.
PROTOCOL
1-WIRE BUS DATA
AFTER ISSUING
PROTOCOL
Start Convert T
Stop Convert T
Read Temperature
EEh
22h
AAh
idle
idle
<read data>
Write TH
01h
<write data>
Write TL
02h
<write data>
Read TH
A1h
<read data>
Read TL
A2h
<read data>
Write Status
0Ch
<write data>
Read Status
ACh
<read data>
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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(chēng):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(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(xiàn)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(kāi)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(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(xiàn)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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