The I2C FAQ

This FAQ is the compilation of information I collected over the years while working with devices that use this communication protocol.
I2C is in a continuous state of flux. The official specification is property of NXP (formerly Philips Semiconductors) and revised from time to time.

This FAQ gives a practical approach to using the I2C protocol in your applications.

History

Protocol

§	Start And Stop conditions

§	Sending a byte to a slave

§	Receiving a byte from a slave

§	Getting aknowledge

§	Giving acknowledge

No Ack

§	Arbitration

§	Clock synchronisation

§	Special adresses

§	Extended adressing

§	Enhanced I2C

§	High speed mode

Hardware

Mini-Faq

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§	I2C Driver in pseudocode

§	Core functions

§	High level functions