The sensor utilizes a digital thermometer (DS18B20) to be established in the resolution of temperature measurement. It has a unique 64-bit number, and two registers for setting the alarm after crossing the lower or upper temperature limit. Layout DS1820 can be connected to a measurement system that uses two or three lines: the masses, the signal line and power line (optional, depending on power mode). Voltage required to perform read, write to the internal EEPROM, and conversions can be derived from an external source of +5 V or directly from the data (stored in an internal capacitor.) Temperature measurement cancarried out in the -55 ... +125 ° C with an accuracy of 0.5 ° C ( -10 ... +85° C) . The conversion to digital value is done with a resolution of 9-12 bits in about 200-750ms (depending on selected resolution). You can save on internal memory DS1820 temperature threshold value (upper and lower - to 8-bits with a resolution of 1 ° C) that causes the flags to set the alarm, which can be read using a special command "search alert".