AVR318: Dallas 1-Wire® master

Features

•Supports standard speed Dallas 1-Wire® protocol.

•Compatible with all AVRs.

•Polled or interrupt-driven implementation.

•Polled implementation requires no external hardware.

Introduction

Dallas 1-Wire® devices are unique in that only one wire in addition to ground is needed to communicate with a device. Power supply and communications are handled through only one connection. To communicate with a Dallas 1-Wire device, only one general purpose I/O pin is needed. This application note shows how a 1-Wire master can be implemented on an AVR, either in software only, or utilizing the U(S)ART module.

8-bit Microcontrollers

Application Note

Rev. 2579A-AVR-09/04