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DS18B20的详细信息

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DS18B20  
Programmable Resolution  
1-Wire Digital Thermometer  
www.maxim-ic.com  
FEATURES  
PIN CONFIGURATIONS  
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Unique 1-Wire? Interface Requires Only One  
Port Pin for Communication  
Each Device has a Unique 64-Bit Serial Code  
Stored in an On-Board ROM  
DALLAS  
18B20  
8
N.C.  
N.C.  
N.C.  
GND  
N.C.  
N.C.  
VDD  
1
2
3
4
7
6
5
Multidrop Capability Simplifies Distributed  
Temperature-Sensing Applications  
Requires No External Components  
Can Be Powered from Data Line; Power Supply  
Range is 3.0V to 5.5V  
1 2 3  
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DQ  
SO (150 mils)  
(DS18B20Z)  
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Measures Temperatures from -55°C to +125°C  
(-67°F to +257°F)  
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±0.5°C Accuracy from -10°C to +85°C  
Thermometer Resolution is User Selectable  
from 9 to 12 Bits  
Converts Temperature to 12-Bit Digital Word in  
750ms (Max)  
User-Definable Nonvolatile (NV) Alarm  
Settings  
Alarm Search Command Identifies and  
Addresses Devices Whose Temperature is  
Outside Programmed Limits (Temperature  
Alarm Condition)  
VDD  
DQ  
N.C.  
N.C.  
GND  
1
2
8
7
N.C.  
N.C.  
N.C.  
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?
?
6
5
3
4
1
2
3
μSOP  
(DS18B20U)  
(BOTTOM VIEW)  
TO-92  
(DS18B20)  
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Available in 8-Pin SO (150 mils), 8-Pin μSOP,  
and 3-Pin TO-92 Packages  
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Software Compatible with the DS1822  
Applications Include Thermostatic Controls,  
Industrial Systems, Consumer Products,  
Thermometers, or Any Thermally Sensitive  
System  
DESCRIPTION  
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an  
alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20  
communicates over a 1-Wire bus that by definition requires only one data line (and ground) for  
communication with a central microprocessor. It has an operating temperature range of -55°C to +125°C  
and is accurate to ±0.5°C over the range of -10°C to +85°C. In addition, the DS18B20 can derive power  
directly from the data line (“parasite power”), eliminating the need for an external power supply.  
Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same  
1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a  
large area. Applications that can benefit from this feature include HVAC environmental controls,  
temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and  
control systems.  
1-Wire is a registered trademark of Maxim Integrated Products, Inc.  
1 of 22  
REV: 042208  
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