DS18B20-PAR Datasheet Text
m o .c U 4 t e e .dalsemi. h S Features a t interface requires only one
- Unique a 1-wire port pin for munication 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
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- DS18B20-PAR 1-Wire Parasite-Power Digital Thermometer
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PIN ASSIGNMENT
DALLAS 18B20P 1 2 3
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Requires no external ponents ±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 mand identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) Software patible 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 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 ±0.5°C over a range of
- 10°C to +85°C. m o .c U 4 t e e h Each DS18B20-PAR has a unique 64-bit identification code, which allows multiple DS18B20-PARs to S a function on the same 1- wire bus; thus, it is simple to use one microprocessor...
