DS18B20-PAR High-Precision Parasite-Power Digital Thermometer


Create a design and simulate using EE-Sim® tools: The DS18B20-PAR digital thermometer provides 9 to 12-bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20-PAR does not need an external power supply because it derives power directly from the data line ("parasite power"). The DS18B20-PAR communicates over a 1-Wire® bus, which 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 +100°C and is accurate to ±0.5°C over a range of -10°C to +85°C.

Each DS18B20-PAR has a unique 64-bit identification code, which allows multiple DS18B20-PARs to function on the same 1-wire bus; thus, it is simple to use one microprocessor to control many DS18B20-PARs 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.

* Unique 1-Wire Interface Requires Only One Port Pin for Communication * Derives Power from Data Line ("Parasite Power")Does Not Need a Local Power Supply * Multi-Drop Capability Simplifies Distributed Temperature Sensing Applications * Requires no External Components * ±0.5°C Accuracy from -10°C to +85°C * Measures Temperatures from -55°C to +100°C (-67°F to +212°F) * Thermometer Resolution is User-Selectable from 9 to 12 Bits * Converts Temperature to 12-Bit Digital Word in 750ms (max.) * User-Definable Non-Volatile Temperature Alarm Settings * Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside of Programmed Limits (Temperature Alarm Condition) * Software compatible with the DS1822-PAR * Ideal for Use in Remote Sensing Applications (e.g., Temperature Probes) That do not Have a Local Power Source

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