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DS1621S+T&R 参数 Datasheet PDF下载

DS1621S+T&R图片预览
型号: DS1621S+T&R
PDF下载: 下载PDF文件 查看货源
内容描述: 数字温度计和温度监控器 [Digital Thermometer and Thermostat]
分类和应用: 监控
文件页数/大小: 16 页 / 332 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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DS1621  
In one-shot mode, the DS1621 performs a single temperature conversion when a Start Convert T  
command is issued. When the conversion is complete, the device enters a low-power idle state and  
remains in that state until a single temperature conversion is again initiated by a Start Convert T  
command.  
Thermostat Control  
In its operating mode, the DS1621 functions as a thermostat with programmable hysteresis as shown in  
Figure 3. The thermostat output updates as soon as a temperature conversion is complete.  
When the DS1621’s temperature meets or exceeds the value stored in the high temperature trip register  
(TH), the output becomes active and will stay active until the temperature falls below the temperature  
stored in the low temperature trigger register (TL). In this way, any amount of hysteresis may be  
obtained.  
The active state for the output is programmable by the user so that an active state may either be a logic  
"1" (VDD) or a logic "0" (0V). This is done using the POL bit in the configuration reagister as explained  
in the Operation and Control section of this datasheet.  
Figure 3. THERMOSTAT OUTPUT OPERATION  
DQ (Thermostat output, Active = High)  
TL  
TH  
T (°C)  
OPERATION AND CONTROL  
The DS1621 must have temperature settings resident in the TH and TL registers for thermostatic  
operation. A configuration/status register also determines the method of operation that the DS1621 will  
use in a particular application, as well as indicating the status of the temperature conversion operation.  
The configuration register is defined as follows:  
MSb  
DONE  
Bit 6  
THF  
Bit5  
TLF  
Bit 4  
NVB  
Bit 3  
X
Bit 2  
X
Bit 1  
POL  
LSb  
1SHOT  
where  
DONE = Conversion Done bit. “1” = Conversion complete, “0” = Conversion in progress.  
THF  
= Temperature High Flag. This bit will be set to “1” when the temperature is greater than or  
equal to the value of TH. It will remain “1” until reset by writing “0” into this location or removing power  
from the device. This feature provides a method of determining if the DS1621 has ever been subjected to  
temperatures above TH while power has been applied.  
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