DS1822-PAR Datasheet | Maxim Integrated

FEATURES - Unique 1-Wire® interface requires only one port pin for munication - Derives power from data line (“parasite power”)- does not need a local power supply - Multidrop capability simplifies distributed temperature sensing applications - Requires no external ponents - ±2.0°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 temperature alarm settings - Alarm search mand identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) - Software patible with the DS18B20-PAR - Ideal for use in remote sensing applications (e.g., temperature probes) that do not have a local power source GND DQ NC Econo 1-Wire Parasite-Power Digital Thermometer PIN ASSIGNMENT DALLAS 1822P 123 12 3 (BOTTOM VIEW) TO-92 (DS1822-PAR) PIN DESCRIPTION - Ground DQ - Data In/Out NC - No Connect DESCRIPTION The DS1822-PAR digital thermometer provides 9- to 12-bit centigrade temperature measurements and has an alarm function with nonvolatile (NV) user-programmable upper and lower trigger points. The DS1822-PAR does not need an external power supply because it derives power directly from the data line (“parasite power”). The DS1822-PAR municates over a 1-Wire bus, which by definition requires only one data line (and ground) for munication with a central microprocessor. It has an operating temperature range of -55°C to +100°C and is accurate to ±2.0°C over a range of -10°C to +85°C. Each DS1822-PAR has a unique 64-bit identification code, which allows multiple DS1822-PARs to function on the same 1-Wire bus; thus, it is simple to use one microprocessor to control many DS1822-PARs distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings,...