DS18B20温度センサーとは何ですか?

DS18B20 is a digital temperature sensor based on single bus protocol. It has high precision, low power consumption and flexible installation characteristics, and is widely used in various temperature monitoring systems. Its core technical characteristics, application scenarios and selection points are as follows:
私. Core characteristics‌
‌Single bus communication‌
Only one data line is needed to complete two-way communication, support multiple devices in parallel (まで 128 devices can be connected), and devices can be distinguished by 64-bit unique ROM ID.
‌High-precision temperature measurement‌
The temperature measurement range is ‌-55°C ~ +125°C‌, and the accuracy is ‌±0.5°C‌ within the range of ‌-10°C ~ +85°C‌;
The resolution can be configured to ‌9~12 bits‌ (default 12 ビット), and the highest resolution is ‌0.0625°C‌.
‌Integrated design‌
The built-in EEPROM stores the alarm threshold and resolution configuration, which will not be lost when the power is off; it supports parasitic power supply mode (no external power supply required).
‌Diverse packaging‌
Provide TO-92 packaging, stainless steel threaded packaging, magnetic packaging, 等, suitable for installation in narrow spaces such as pipelines, oil tanks, 回路基板, 等.

DS18B20温度センサーとは

DS18B20 防水温度センサープローブ + ターミナルアダプターモジュール ワイヤーセット付

DS18B20 waterproof temperature sensor function module assembly

‌II. Typical application scenarios‌

Ⅲ. Selection and use points‌
‌Interface design‌
A single bus needs to be connected to a 4.7kΩ pull-up resistor, and the data line needs to provide a strong pull-up current when parasitic power is supplied.
‌Accuracy optimization‌
The conversion time at 12-bit resolution is 750ms, and the resolution can be reduced in exchange for speed in high-speed sampling scenarios.
‌Environmental adaptability‌
For humid/corrosive environments, stainless steel sealed packaging (such as the LTM8877 series) is selected;
For high-temperature scenarios (>100℃), avoid using plastic-sealed TO-92 models.
‌Anti-collision mechanism‌
When multiple devices are connected in parallel, the ID needs to be traversed through the ROM search algorithm to avoid bus conflicts.

digital Output:
The DS18B20 provides digital temperature readings, meaning it doesn’t require an ADC (アナログからデジタルへのコンバーター) on the microcontroller side.

1-Wire Interface:
It communicates using a single data line, 接地ワイヤーとともに, which simplifies wiring and reduces the number of connections needed.

Parasite Power:
The sensor can operate in “parasite power” mode, drawing power directly from the data line, eliminating the need for an external power source in some cases.

正確さ:
It boasts an accuracy of ±0.5°C over a typical range of -10°C to +85°C.

温度範囲:
The DS18B20 can measure temperatures from -55°C to +125°C.

Unique ID:
Each DS18B20 sensor has a unique 64-bit serial number, allowing multiple sensors to be connected to the same 1-Wire bus.

Resolution:
The temperature resolution can be programmed to 9, 10, 11, または 12 ビット, affecting the precision of the readings.

‌IV. Comparison with other sensors‌

Note‌: DS18B20 is suitable for low and medium temperature scenarios between -55°C and 125°C. Thermocouples are recommended for ultra-high temperatures (＞200°C) and platinum resistors are recommended for ultra-low temperatures (＜-55°C).