Yes, both I3C and I²C can share the same bus, with some limitations:

  • I3C does not support Legacy I2C Controller Devices, because they cannot share the Bus with I3C Devices.
  • I3C does support many Legacy I2C Target Devices, on the condition that they meet certain guidelines; see also Q15.1, "Is I3C backward compatible with I²C?" regarding backward compatibility.

Note: This question has been updated for I3C v1.1.1 and I3C Basic v1.1.1.

FAQ Type: