Description

The DS18B20 is a high-precision, programmable digital thermometer capable of providing 9 to 12-bit temperature readings via a simple 1-Wire interface. Its compact design eliminates the need for external components, making it an ideal choice for distributed temperature sensing. The sensor’s unique silicon serial number allows multiple devices to coexist on the same data bus, enabling flexible deployment across various applications. The DS18B20 supports both external power and parasitic power operation, providing versatility for energy-efficient designs.

Key Features & Benefits

• Unique 1-Wire Interface: Reduces wiring complexity with single-port communication.
• Multidrop Capability: Enables multiple sensors on the same bus for distributed sensing.
• High Precision: Programmable resolution up to 12 bits with ±0.5°C accuracy from -10°C to +85°C.
• Wide Operating Range: Measures temperatures from -55°C to +125°C (-67°F to +257°F).
• Alarm Functionality: User-configurable nonvolatile temperature alarm settings.
• Compact and Flexible: Supports parasite power or external power supply (3.0V to 5.5V).

Applications

• HVAC environmental controls
• Industrial process monitoring and control
• Consumer-grade thermometers
• Thermostatic controls for appliances
• Temperature monitoring in machinery and equipment

Specifications

• Temperature Range: -55°C to +125°C (-67°F to +257°F)
• Accuracy: ±0.5°C from -10°C to +85°C
• Resolution: Programmable 9–12 bits
• Conversion Time: 750 ms (max) for 12-bit resolution
• Interface: 1-Wire communication protocol
• Power Supply: 3.0V to 5.5V or parasitic power
• Standby Power: Zero standby power required
• Alarm Triggers: User-definable nonvolatile TH and TL settings
• Operating Modes:
  • External power mode (VDD connected to supply)
  • Parasitic power mode (VDD grounded)