DS18B20-EV Digital Thermometer

EVVO's DS18B20-EV digital thermometer supplies 9-bit to 12-bit readings and has an alarm function with nonvolatile user- programmable upper and lower trigger points. It communicates over a 1-wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It also has an operating temperature range of -55°C to +125°C and is accurate to ±0.4°C over the range of -10°C to +70°C. In addition, the DS18B20-EV can derive power directly from the data line (parasite power), eliminating the need for an external power supply. Each DS18B20-EV has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-wire bus. Therefore 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.