The Adafruit DS2484 is a single-channel I2C-to-1-Wire bus adapter breakout with built-in ESD protection and split supply support. Simply connect it to an existing I2C bus and use the screw terminals to attach DS18B20 temperature sensors or other 1-Wire devices.

The 1-Wire protocol, originally developed by Dallas Semiconductor, uses a single data wire plus ground (and an optional power wire) to communicate with multiple sensors or memory chips on a shared bus. While you can bit-bang 1-Wire on most microcontrollers, the DS2484 provides a dedicated hardware bridge for platforms without native 1-Wire support — including desktop computers and single-board computers with I2C.

Key Features

• DS2484 Controller – Single-channel I2C-to-1-Wire bridge with hardware protocol handling
• ESD Protection – Built-in electrostatic discharge protection for the 1-Wire bus
• Split Supply Support – Independent voltage for the 1-Wire power pin via cuttable trace and terminal block injection
• Screw Terminals – Easy connection for 1-Wire devices without soldering
• STEMMA QT / Qwiic – Dual I2C connectors for solderless daisy-chaining with other I2C devices
• Wide Voltage Range – Works with 3.3V or 5V logic from the STEMMA QT cable

Also Available

• DS2482S-800 – 8-Channel I2C to 1-Wire Bus Adapter

Ideal For

• DS18B20 temperature sensor networks
• Adding 1-Wire capability to I2C-only platforms
• Long-distance sensor wiring with shared bus topology
• Prototyping with breadboard-friendly breakout form factor

Package Contents

• 1× Adafruit DS2484 I2C to 1-Wire Bus Adapter Breakout (fully assembled)