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The digital temperature sensor of DS18B20
The digital temperature sensor of DS18B20, This product uses the American
DALLAS companys DS18B20 network digital temperature sensor chip package. but
become wear-resistant touch, the physical volume is small, convenient, packaging
form is varied , Suitable for all kinds of narrow space in digital temperature test and
control field equipment.
Unique 1-WireTM interface requires only one port pin for communication.
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, Zero standby power required, Measures temperatures from -55C to+125 C.° °
Fahrenheit equivalent is -67 °F to+257 °F, 0.5 C accuracy from -10 °C to +85°C,
Thermometer resolution is programmable from 9 to 12 bits, Converts 12-bit
temperature to digital word in750 ms (max.).User-definable, nonvolatile temperature
alarm settings, Alarm search command identifies and addresses devices whose
temperature is outside of programmed limits (temperature alarm
condition).Applications include thermostatic controls, industrial systems, consumer
products, thermometers, or any thermally sensitive system.
1、the description oftechnique function:
1) Single-line interface is unique, DS18B20 while linking with microprocessor only
need a line can immediately carry out the double of microprocessor and
DS18B20 toward the communication.
2) measure scope-55℃ ~ +125 ℃ , proper measure resolutions 0.5℃ .
3) support several set nets function, several DS18B20 can merge at unique three
on-line, the most can merge 8, if amount was excessive, it would make power
supply the power electric voltage over low, result in thus the signal delivers of
unsteady, the realizations order to me
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