Overview
The DS18B20-SL+T&R is a programmable resolution 1-Wire digital thermometer produced by Analog Devices Inc. (now part of Maxim Integrated). This temperature sensor IC is designed for high-precision temperature monitoring and is ideal for applications requiring minimal connections. The DS18B20 communicates over a 1-Wire bus, which requires only one data line and ground for communication with a central microprocessor. This feature simplifies distributed temperature-sensing applications and allows multiple DS18B20s to function on the same bus, each identified by a unique 64-bit serial code.
Key Specifications
| Parameter | Value |
|---|---|
| Temperature Range | -55°C to +125°C |
| Accuracy | ±0.5°C from -10°C to +85°C |
| Resolution | 9-bit to 12-bit Celsius temperature measurements |
| Package Type | TO-92, 3 Pins |
| Power Supply | Can derive power from the data line (parasite power), or external supply (2.2V to 5.5V) |
| Standby Current | 750 nA to 1000 nA |
| Active Current | 1 mA to 1.5 mA at VDD = 5V |
| Alarm Function | Nonvolatile user-programmable upper and lower trigger points |
Key Features
- Unique 1-Wire Interface: Requires only one data line and ground for communication, simplifying distributed temperature-sensing applications.
- Integrated Temperature Sensor and EEPROM: Reduces component count and integrates nonvolatile memory for alarm settings.
- Programmable Resolution: User-configurable resolution from 9 bits to 12 bits, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively.
- Parasite Power Capability: Can derive power directly from the data line, eliminating the need for an external power supply.
- Alarm Function: Nonvolatile user-programmable upper and lower trigger points with alarm search command to identify devices with temperatures outside programmed limits.
- Unique 64-bit Serial Code: Allows multiple DS18B20s to function on the same 1-Wire bus.
Applications
- Industrial: Temperature monitoring in industrial environments, process monitoring, and control systems.
- Consumer Electronics: Temperature monitoring in consumer electronics, such as HVAC systems and appliances.
- Environmental Controls: Temperature monitoring systems inside buildings, equipment, or machinery.
- Process Monitoring and Control: Monitoring and controlling temperatures in various industrial processes.
Q & A
- What is the temperature range of the DS18B20-SL+T&R?
The temperature range of the DS18B20-SL+T&R is from -55°C to +125°C.
- What is the accuracy of the DS18B20-SL+T&R?
The accuracy of the DS18B20-SL+T&R is ±0.5°C from -10°C to +85°C.
- What is the resolution of the DS18B20-SL+T&R?
The resolution is user-configurable from 9 bits to 12 bits, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively.
- What is the package type of the DS18B20-SL+T&R?
The package type is TO-92 with 3 pins.
- Can the DS18B20-SL+T&R derive power from the data line?
Yes, the DS18B20-SL+T&R can derive power directly from the data line (parasite power), eliminating the need for an external power supply.
- What is the standby current of the DS18B20-SL+T&R?
The standby current is between 750 nA and 1000 nA.
- Does the DS18B20-SL+T&R have an alarm function?
Yes, it has a nonvolatile user-programmable upper and lower trigger points for alarm signaling.
- Can multiple DS18B20-SL+T&R devices be used on the same 1-Wire bus?
Yes, each DS18B20-SL+T&R has a unique 64-bit serial code, allowing multiple devices to function on the same bus.
- What are some common applications of the DS18B20-SL+T&R?
Common applications include industrial temperature monitoring, consumer electronics, HVAC environmental controls, and process monitoring and control systems.
- How does the DS18B20-SL+T&R communicate with a microprocessor?
The DS18B20-SL+T&R communicates over a 1-Wire bus, which requires only one data line and ground for communication with a central microprocessor.
