DS18B20-PAR

m o .c U 4 t e e www.dalsemi.com h S FEATURES a t interface requires only one Unique a 1-wire port pin for communication D . Derives power from data line (“parasite w power”)—does not need a local power supply w Multi-drop capability simplifies distributed w temperature sensing applications DS18B20-PAR 1-Wire Parasite-Power Digital Thermometer ® PIN ASSIGNMENT DALLAS 18B20P 1 2 3 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 750 ms (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 DESCRIPTION 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 oper...