毕业论文文翻译-DS18B20单线温度传感器.doc

DS18B20 Single - wire temperature sensor 一. FEATURES ● Unique 1-Wireinterface requires only one port pin for communication ● Each device has a unique 64-bit serial code stored in an onboard ROM ● Multidrop capability simplifies distributed temperature sensing applications ● Requires no external components ● Can be powered from data line. Power supply range is 3.0V to 5.5V ● Measures temperatures from –55°C to +125°C (–67°F to +257°F)
0.5C accuracy from –10°C to +85°C ● Thermometer resolution is user-selectable from 9 to 12 bits ● Converts temperature to 12-bit digital word in 750ms (max.) ● User-definable nonvolatile (NV) alarm settings ● Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) ● Available in 8-pin SO (150mil), 8-pin SOP, and 3-pin TO-92 packages ● Software compatible with the DS1822 ● Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive 二. DESCRIPTION The DS18B20 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 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of –55°C to +125°Cand is accurate to
0.5C over the range of –10°C to +85°C. In addition, the DS18B20 can derive powerdirectly from the data line (“parasite power”), eliminating the need for an external power supply. Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1–wire bus; thus, 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, equipm