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Interfacing 1-Wire communications device with PIC microcontroller

Posted: 21 Aug 2008     Print Version  Bookmark and Share

Keywords:1-Wire protocol  PIC microcontrollers  general purpose I/O  software stack 

Microchip introduces a software stack for the basic, standard speed, 1-Wire master communication along with a sample application in this document. This application note also provides methods in developing a sophisticated 1-Wire application using API developed on PIC microcontrollers.

The PIC microcontrollers have multiple general purpose I/O (GPIO) pins and easily configures to implement Maxim/Dallas Semiconductor's 1-Wire protocol.

The 1-Wire protocol allows interaction with many Maxim/Dallas Semiconductor parts, including battery and thermal management devices, memory and iButtons. 1-Wire devices provide solutions for identification, memory, timekeeping, measurement and control, and communicate using a single data line and well-defined, time-tested protocols.

As most 1-Wire devices provide a relatively small amount of data via a single data line with a ground reference, the typical data rate of 16Kbps is sufficient for the intended tasks. It is often convenient to use a GPIO pin of an 8-bit or 16-bit microcontroller in a "bit banging" manner to act as the bus master.

View the PDF document for more information.

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