While this could change in future, the minimal requirements to date have been the availability of a board with an I3C Device that can connect to other Devices via the three wires SDA, SCL, and GND. It’s also useful to have software (e.g., running on a laptop connected to the board and I3C Device) to interactively view transmitted and received bus communications, but this might not be required for Slaves.

Currently there are solutions working at 3.3V and 1.8V.

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