I2C (I²C) is a Multi-master, multi-slave, Packet switching, single-ended, serial computer Hardware BUS invented in 1982 by Philips Semiconductor (now NXP Semiconductors).

I2C is widely used for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication.

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There might be more information for this subject on one of the following:
  • [#1] - I²C - based on information obtained 2017-12-08-