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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