Overview
The DS18B20-SL+TCKJ, produced by Analog Devices Inc./Maxim Integrated, is a programmable resolution 1-Wire digital thermometer. This device is designed to provide high-precision temperature measurements with minimal connections, making it ideal for multisensor systems. The DS18B20 communicates over a 1-Wire bus, requiring only one data line and ground for communication with a central microprocessor. It can derive power directly from the data line, eliminating the need for an external power supply, a feature known as "parasite power".
Key Specifications
| Specification | Value |
|---|---|
| Sensor Type | Digital, Local |
| Sensing Temperature Range | -55°C to +125°C (-67°F to +257°F) |
| Output Type | 1-Wire® |
| Power Supply Range | 3.0V to 5.5V |
| Resolution | 9-bit to 12-bit (configurable) |
| Accuracy | ±0.5°C from -10°C to +85°C |
| Conversion Time (12-bit) | 750 ms (max.) |
| Standby Current | 750 nA to 1000 nA |
| Active Current (VDD = 5V) | 1 mA to 1.5 mA |
Key Features
- Unique 1-Wire Interface: Requires only one port pin for communication, allowing multiple devices on the same bus.
- Parasite Power: Can be powered from the data line, eliminating the need for an external power supply.
- Programmable Resolution: Temperature resolution is configurable from 9 to 12 bits, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C.
- Alarm Function: Nonvolatile user-programmable upper and lower trigger points for temperature alarms.
- Unique Serial Code: Each device has a unique 64-bit serial code, enabling multiple devices to operate on the same 1-Wire bus.
Applications
- HVAC Environmental Controls: Ideal for temperature monitoring and control in heating, ventilation, and air conditioning systems.
- Temperature Monitoring Systems: Suitable for monitoring temperatures inside buildings, equipment, or machinery.
- Process Monitoring and Control Systems: Used in various industrial processes where precise temperature monitoring is crucial.
- Consumer Products and Thermostatic Controls: Applied in consumer electronics and thermostatic control systems.
Q & A
- What is the temperature range of the DS18B20?
The DS18B20 measures temperatures from -55°C to +125°C (-67°F to +257°F).
- How does the DS18B20 communicate?
The DS18B20 communicates over a 1-Wire bus, requiring only one data line and ground for communication with a central microprocessor.
- Can the DS18B20 be powered without an external supply?
- What is the resolution of the DS18B20?
The temperature resolution is programmable from 9 to 12 bits, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C.
- Does the DS18B20 have an alarm function?
- How many devices can be connected on the same 1-Wire bus?
- What is the conversion time for a 12-bit resolution measurement?
- What is the standby current of the DS18B20?
- What are some common applications of the DS18B20?
- How accurate is the DS18B20 in its temperature measurements?
