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== 版本 == The history of I²C specification releases: * In 1982, the original 100 kHz I²C system was created as a simple internal bus system for building control electronics with various Philips chips. * In 1992, Version 1 added 400 kHz Fast-mode (Fm) and a 10-bit addressing mode to increase capacity to 1008 nodes. This was the first standardized version. * In 1998, Version 2 added 3.4 MHz High-speed mode (Hs) with power-saving requirements for electric voltage and current. * In 2000, Version 2.1 clarified version 2, without significant functional changes. * In 2007, Version 3 added 1 MHz Fast-mode plus (Fm+) (using 20 mA drivers), and a device ID mechanism. * In 2012, Version 4 added 5 MHz Ultra Fast-mode (UFm) for new USDA (data) and USCL (clock) lines using push-pull logic without pull-up resistors, and added an assigned manufacturer ID table. It is only a unidirectional bus. * In 2012, Version 5 corrected mistakes. * In 2014, Version 6 corrected two graphs. This is the most recent standard <br>
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