7Semi DS18B20 2M Cable Waterproof Digital Temperature Probe

Overview

The probe is based on the DS18B20 digital temperature sensor IC, a widely used digital temperature sensor with a waterproof probe enclosure and 2-meter cable.

• Measures:

  • Temperature only

   

• Provides:

  • Digital output via 1-Wire interface

   

• Designed for:

  • Remote and harsh environment temperature sensing

   

The probe format allows measurement in liquids, outdoor, or inaccessible locations.

Working Principle

Temperature Sensing

• Uses an integrated semiconductor temperature sensor

• Converts temperature into a digital value internally

• No external ADC required

12-bit ADC converts analog temperature signal into digital data

Output is transmitted over 1-Wire protocol

1-Wire Communication

• Uses a single data line + ground

• Each sensor has a unique 64-bit ID

Multiple sensors can share the same bus.

Measurement Characteristics

• Temperature range: 55C to +125C

• Accuracy:

  • 0.5C (10C to +85C typical)

   

• Resolution: programmable:

  • 9-bit to 12-bit

  • 12-bit 0.0625C resolution

   

Electrical Characteristics

• Supply voltage: 3.0V to 5.5V

• S

  Powered via VCC pin

2. Parasite Power Mode

• Powered through data line (DQ)

• No separate VCC required

Useful for minimal wiring applications.

Communication Interface

1-Wire Protocol

• Single data pin (DQ)

• Requires:

  • Pull-up resistor (~4.7k typical)

   

Data Transmission

• Master (microcontroller) initiates communication

• Sensor responds with:

  • Temperature data

  • Unique ID

   

Internal Features

Unique 64-bit Address

• Each sensor individually identifiable

• Enables multiple sensors on one bus

Programmable Resolution

• Trade-off between:

  • Speed

  • Precision

   

figuration settings

Retains data after power loss

CRC Error Checking

• Ensures reliable data communication

Probe Design Characteristics

Waterproof Stainless Steel Probe

• Sealed metal enclosure

• Protects sensor from:

  • Water

  • Dust

  • Corrosion

   

2-Meter Cable

• Enables:

  • Remote sensing

  • Flexible installation

   

Pre-Wired Connections

Typical wires:

• Red VCC

• Black GND

• Yellow Data (DQ)

Environmental Performance

• Suitable for:

  • Liquids (water, non-corrosive fluids)

  • Outdoor environments

   

• High durability due to sealedsion Time

  • Depends on resolution:

    • 12-bit ~750 ms

    • Lower resolution faster

     

  Stable Output

  • Digital output reduces noise

  • Reliable over long cable distances (with proper wiring)

   

  Limitations

  • Not suitable for:

    • Extremely fast temperature changes (due to probe thermal lag)

     

  • Accuracy affected by:

    • Poor thermal contact

    • Cable interference (if not shielded)

     

  • Parasite mode less stable for long cables

   

  Functional Role

  The module acts as a:

  • Digital temperature probe

  • Remote sensing device

  • Multi-point temperature monitoring node

   

  Summary

  The 7Semi DS18ust digital temperature sensing solution that:

  • Uses 1-Wire digital communication

  • Provides high-resolution temperature data

  • Supports multi-sensor networks via unique IDs

  • Features a sealed waterproof probe with 2m cable

  • Offers reliable and noise-resistant measurements