Editing 1-Wire (section)

{{Short description|Device communications bus system}}
[[File:I-button.jpg|thumb|right|350px|An {{not a typo|iButton}} in a plastic fob, as used for Istanbul [[Akbil (smart ticket)|Akbil smart ticket]]]]
[[File:Java Ring.jpg|thumb|right|200px|A Java ring with an embedded {{not a typo|iButton}}]]

'''1-Wire''' is a [[Wired communication|wired]] [[half duplex|half-duplex]] [[Serial communication|serial]] [[Bus (computing)|bus]] designed by [[Dallas Semiconductor]] that provides low-speed (16.3&nbsp;kbit/s<ref>{{Cite web|url=https://www.analog.com/en/app-notes/reading-and-writing-1wirereg-devices-through-serial-interfaces.html|title=Reading and Writing 1-Wire Devices Through Serial Interfaces|website=Maxim Integrated|language=en-US|access-date=2022-12-21}}</ref>) [[data communication]] and [[IC power-supply pin|supply voltage]] over a single [[Electrical conductor|conductor]].<ref>{{Cite web |title=Overview of 1-Wire Technology and Its Use |url=https://www.analog.com/en/technical-articles/guide-to-1wire-communication.html |url-status=live |archive-url=https://web.archive.org/web/20230627125557/https://www.analog.com/en/technical-articles/guide-to-1wire-communication.html |archive-date=2023-06-27 |access-date=2023-07-21 |website=[[Analog Devices]]}}</ref>

1-Wire is similar in concept to [[I2C|I<sup>2</sup>C]], but with lower data rates and longer range. It is typically used to communicate with small inexpensive [[electronic component|device]]s such as digital [[thermometer]]s and weather instruments. A network of 1-Wire devices with an associated [[Master/slave (technology)|master]] device is called a '''MicroLAN'''. The protocol is also used in small electronic keys known as a '''Dallas key''' or '''{{not a typo|iButton}}'''.

One distinctive feature of the bus is the possibility of using only two conductors&nbsp;— data and ground. To accomplish this, 1-Wire devices integrate a small [[capacitor]] (~800{{nbsp}}[[farad|pF]]) to store charge, which powers the device during periods when the data line is active.