Ds18b20

The DS18B20 digital thermometer provides 9-bit to12-bit Celsius temperature measurements and has analarm function with nonvolatile user-programmable upperand lower trigger points. The DS18B20 communicatesover a 1-Wire bus that by definition requires only onedata line (and ground) for communication with a centralmicroprocessor. In addition, the DS18B20 can derivepower directly from the data line (“parasite power”),eliminating the need for an external power supply.Each DS18B20 has a unique 64-bit serial code, whichallows multiple DS18B20s to function on the same 1-Wirebus. Thus, it is simple to use one microprocessor tocontrol many DS18B20s distributed over a large area.Applications that can benefit from this feature includeHVAC environmental controls, temperature monitoringsystems inside buildings, equipment, or machinery, andprocess monitoring and control systems