Adafruit
Adafruit DS2484 I2C to 1-Wire Bus Adapter Breakout
· MPN: ADA5976
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 exi...
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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
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)
Jargon buster
Plain-language definitions for the technical terms used above.
- 1-Wire
- 1-Wire is a communication method where devices share a single data line, often with each device having its own address. It matters because several temperature modules can be connected to one microcontroller pin instead of needing a separate pin for each probe.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- DS18B20
- The DS18B20 is a common digital temperature sensor, often supplied in a waterproof stainless-steel probe, that sends its readings to a microcontroller over a 1-Wire connection. It is a typical choice for adding temperature data to environmental or water-monitoring projects.
- ESD protection
- ESD protection helps protect electronics from damage caused by static electricity discharges. It is useful on development boards because cables, sensors and modules are often plugged and unplugged during prototyping.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- Terminal block
- A terminal block is a connector that joins wires together in a neat, removable, or serviceable way, usually clamping each wire under a screw or spring instead of soldering. It makes it easier to connect, change, or service wiring without permanent joints.
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