While I²C has seen wide adoption over the years, it lacks some critical features – especially as mobile and mobile-influenced systems continue to integrate more and more sensors and other components. I²C limitations worth mentioning include: 7-bit fixed address (no virtual addressing), no in-band interrupt (requires additional wires/pins), limited data-rate, and the ability of Slaves to stretch the clock (thus potentially hanging up the system, etc.). I3C aims both to fix these limitations and to add other enhancements.

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