The read/write sequence and temperature measurement principle of the DS18B20 temperature sensor are the same as the DS1820, but the number of digits of the obtained temperature value is different due to different resolutions, and the delay time during the temperature conversion is reduced from 2 s to 750ms.
What are the main parameters of the DS18B20 temperature sensor?
What is the scope of application of the DS18B20 temperature sensor?
What is the workflow of the DS18B20 temperature sensor?
What are the main parameters of the DS18B20 temperature sensor?
1. Working voltage: 3.0V to 5.5V
2. Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
3. ±0.5°C Accuracy from -10°C to +85°C
4. Programmable Resolution from 9 Bits to 12 Bits
5. No External Components Required
6. Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
7. Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
What is the scope of application of the DS18B20 temperature sensor?
The DS18B20 temperature sensor is suitable for temperature measurement and control fields such as freezer, grain storage, storage tank, telecommunication room, gym, cable duct, etc.
Temperature measurement and control of industrial plants in confined spaces such as bearing bushings, cylinders, textile machines, air conditioning systems, etc.
The DS18B20 temperature sensor can be used in vehicle air conditioners, refrigerators, freezers and drying boxes for medium and low temperatures.
The DS18B20 temperature sensor can also be used for heat measurement of heating/cooling lines, heat energy measurement of central air conditioning systems in the household, and industrial temperature measurement and control.
What is the workflow of the DS18B20 temperature sensor?
The read/write sequence and temperature measurement principle of the DS18B20 temperature sensor are the same as the DS1820, except that the number of digits of the obtained temperature value is different due to different resolutions, and the delay time during temperature conversion is reduced from 2 s to 750ms. The oscillation rate of the high temperature coefficient quartz oscillator changes significantly with the temperature change, and the generated signal is used as the pulse input of the counter 2. The counter 1 and the temperature register are preset to a base value equal to –55°C. Counter 1 counts down the pulse signal generated by the crystal oscillator with low temperature coefficient. When the preset value of counter 1 is reduced to 0, the value of the temperature register increases by 1, the preset value of counter 1 is reloaded, and counter 1 is restarted. Count the pulse signal generated by the low temperature coefficient quartz oscillator and repeat this cycle until the counter counts 2 to 0, stop the accumulation of the temperature register value, and the value in the temperature register at this time is the measured temperature. The slope accumulator is used to compensate and correct the nonlinearity in the temperature measurement process, and its output is used to correct the preset value.
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