Overview
The DS18B20+TCKJ, produced by Analog Devices Inc./Maxim Integrated, is a programmable resolution 1-Wire digital thermometer. This device is designed to provide accurate and reliable temperature measurements over a wide range of temperatures. It features a unique 64-bit serial code, allowing multiple devices to be connected on the same 1-Wire bus and addressed individually. The DS18B20 can operate in either parasite power mode or with an external power supply, making it versatile for various applications.
Key Specifications
| Specification | Value |
|---|---|
| Temperature Range | -55°C to +125°C (-67°F to +257°F) |
| Temperature Resolution | 9-bit to 12-bit (configurable): 0.5°C, 0.25°C, 0.125°C, 0.0625°C |
| Accuracy | ±0.5°C (from -10°C to +85°C) |
| Power Supply | 3.0V to 5.5V (external), or parasite power from the data line |
| Communication Protocol | 1-Wire interface |
| Package Type | TO-92-3 |
| Conversion Time | Up to 750 ms (12-bit resolution) |
| Unique Identifier | 64-bit serial code |
Key Features
- Unique 64-Bit Serial Code: Each device has a unique identifier, allowing multiple devices to be connected on the same bus and addressed individually.
- Parasite Power Mode: The device can derive power directly from the data line, eliminating the need for an external power supply.
- Nonvolatile Memory: Configuration and serial number are stored in EEPROM, retaining settings even when power is off.
- Compact Size: Available in small form factors such as TO-92-3, enhancing durability and suitability for various applications.
- Fast Conversion Time: Temperature readings can be updated within 750 ms (12-bit resolution).
- Alarm Function: Programmable high and low temperature alarms with nonvolatile trigger points.
Applications
The DS18B20 is suitable for a variety of applications, including:
- HVAC Environmental Controls: Monitoring and controlling temperature in heating, ventilation, and air conditioning systems.
- Temperature Monitoring Systems: Used in buildings, equipment, or machinery to monitor temperature.
- Process Monitoring and Control Systems: Ideal for industrial automation and process control.
- Home Automation: For temperature monitoring in smart home systems.
- Data Centers and Cold Chain Logistics: Ensuring optimal temperature conditions in data centers and cold chain logistics.
- Consumer Electronics and Scientific Research: Due to its small form factor, low power consumption, and rugged design.
Q & A
- What is the temperature range of the DS18B20?
The DS18B20 can measure temperatures from -55°C to +125°C (-67°F to +257°F). - What are the available resolutions for the DS18B20?
The DS18B20 offers resolutions of 9-bit, 10-bit, 11-bit, and 12-bit, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively. - How does the DS18B20 derive power in parasite power mode?
The DS18B20 derives power from the 1-Wire data line by storing energy on an internal capacitor during high periods of the bus signal. - What is the unique feature of each DS18B20 device?
Each DS18B20 has a unique 64-bit serial code, allowing multiple devices to be addressed individually on the same 1-Wire bus. - What is the conversion time for the DS18B20 at 12-bit resolution?
The conversion time for the DS18B20 at 12-bit resolution is up to 750 ms. - Does the DS18B20 have an alarm function?
Yes, the DS18B20 has programmable high and low temperature alarms with nonvolatile trigger points. - What is the power supply range for the DS18B20?
The DS18B20 can operate with an external power supply ranging from 3.0V to 5.5V. - How does the DS18B20 communicate with a microcontroller?
The DS18B20 communicates via a 1-Wire interface, requiring only one data line and ground for communication. - What is the accuracy of the DS18B20 temperature measurements?
The DS18B20 provides an accuracy of ±0.5°C from -10°C to +85°C. - Can the DS18B20 be used in outdoor applications?
Yes, the DS18B20 is suitable for outdoor applications due to its compact size and rugged design, often packaged in stainless steel tubes.
