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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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DS18B20 Datasheet(Hoja de datos) 1 Page - Dallas Semiconductor |
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1 page ![]() 1 of 22 REV: 042208 FEATURES 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 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 Measures Temperatures from -55°C to +125°C (-67°F to +257°F) ±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) Available in 8-Pin SO (150 mils), 8-Pin μSOP, and 3-Pin TO-92 Packages Software Compatible with the DS1822 Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System PIN CONFIGURATIONS 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. DS18B20 Programmable Resolution 1-Wire Digital Thermometer www.maxim-ic.com 1-Wire is a registered trademark of Maxim Integrated Products, Inc. TO-92 (DS18B20) 1 (BOTTOM VIEW) 2 3 DALLAS 18B20 1 2 3 SO (150 mils) (DS18B20Z) N.C. N.C. N.C. N.C. GND DQ VDD N.C. 6 8 7 5 3 1 2 4 N.C. VDD N.C. N.C. N.C. GND N.C. DQ 6 8 7 5 3 1 2 4 μSOP (DS18B20U) |