Introduction

Dallas 1-Wire® devices are unique in that only one wire, in addition to the 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 a Microchip AVR®, either in software only, or utilizing the U(S)ART module.