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DS1821S+TR

更新时间： 2024-01-21 18:42:47
品牌 Logo 应用领域
达拉斯 - DALLAS 监控
页数 文件大小 规格书
18页 455K
描述
Programmable Digital Thermostat and Thermometer

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DS1821S+TR 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：TO-220, 3 PINReach Compliance Code：unknown
风险等级：5.78Is Samacsys：N
外壳：PLASTICJESD-609代码：e0
安装特点：THROUGH HOLE MOUNT位数：8
端子数量：3最大工作电流：1 mA
最高工作温度：125 °C最低工作温度：-55 °C
输出接口类型：1-WIRE INTERFACE封装主体材料：PLASTIC/EPOXY
封装等效代码：SIP3,.1TB封装形状/形式：RECTANGULAR
电源：3/5 V传感器/换能器类型：TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL
子类别：Other Sensors最大供电电压：5.5 V
最小供电电压：2.7 V表面贴装：NO
端子面层：Tin/Lead (Sn/Pb)端接类型：SOLDER
Base Number Matches：1

DS1821S+TR 数据手册

 浏览型号DS1821S+TR的Datasheet PDF文件第4页浏览型号DS1821S+TR的Datasheet PDF文件第5页浏览型号DS1821S+TR的Datasheet PDF文件第6页浏览型号DS1821S+TR的Datasheet PDF文件第8页浏览型号DS1821S+TR的Datasheet PDF文件第9页浏览型号DS1821S+TR的Datasheet PDF文件第10页 
DS1821  
OPERATION – THERMOSTAT  
When the DS1821 is in thermostat mode (T/R¯ = 1 in the status/configuration register), temperature  
conversions are performed continuously beginning at power-up (regardless of the value of the 1SHOT  
bit), and the DQ pin serves as the thermostat output. The DQ output will become active when the  
temperature of the DS1821 exceeds the user-defined limit in the TH register, and will remain active until  
the temperature drops below the user-defined limit in the TL register as illustrated in Figure 4. Thus, the  
user can select TH and TL to provide the desired amount of thermostat output hysteresis.  
The user-defined 8-bit centigrade trip-point values (TH and TL) must be stored in two’s complement  
format as shown in Figure 3. The sign bit (S) indicates if the temperature is positive or negative; for  
positive numbers S = 0 and for negative numbers S = 1. The non-volatile TH and TL registers must be  
programmed when the DS1821 is in 1-Wire mode as explained in the OPERATING MODES section of  
this datasheet. The DS1821 can be temporarily switched from thermostat mode to 1-Wire mode to  
change the TH and TL values as also explained in the OPERATING MODES section.  
The polarity (i.e., the active state) of the DQ output is user-selectable with the nonvolatile POL bit in the  
status/configuration register. DQ is active-high when POL = 1, and DQ is active-low when POL = 0.  
Two bits in the status/configuration register, THF and TLF, provide additional thermostatic information.  
The value of these bits is normally 0. The THF (temperature high flag) bit will be set to 1 if the measured  
temperature is ever greater than the value in the TH register and will remain a 1 until the user rewrites the  
bit with a 0. The TLF (temperature low flag) bit will be set to 1 if the temperature is ever lower than the  
value in the TL register and will remain a 1 until the user rewrites the bit with a 0. These bits provide a  
record of the device temperature relative to the thermostat trip-points over a period of time. They are  
stored in nonvolatile memory, so the data stored in THF and TLF can be analyzed after any number of  
power cycles. The THF and TLF bits function in both 1-Wire and thermostat mode.  
DQ OPERATION IN THERMOSTATE MODE Figure 4  
Operating Mode = Thermostat  
POL=1 (DQ is active high)  
DQ  
Temp (°C)  
TL  
TH  
STATUS/CONFIGURATION REGISTER  
The status/configuration register provides information to the user about conversion status, EEPROM  
activity and thermostat activity. It also allows the user to program various DS1821 options such as  
power-up operating mode, thermostat output polarity and conversion mode. The status/configuration  
register is arranged as shown in Figure 5 and detailed descriptions of each bit are provided in Table 3.  
Note that the THF, TLF T/R¯, POL and 1SHOT bits are stored in nonvolatile memory (EEPROM).  
CONFIGURATION REGISTER Figure 5  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2  
bit 1  
bit 0  
DONE  
1
NVB THF* TLF*  
POL* 1SHOT*  
T/R¯*  
*Stored in EEPROM  
7 of 18  
1...45678910...18

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