24.4.3 I3C Bus Operation

An I³C bus operates with an Active Controller and one or more Targets, exchanging data using two lines, SDA and SCL, with many similarities to the I²C bus.

SCL: The Serial CLock line is the used by the controller to clock data on the SDA line. SCL is driven by the Active Controller in Push-Pull mode.

SDA: The Serial DAta line mostly carries data in/out and is also used for additional signaling purposes. Unlike SCL, SDA can be driven either by the Active Controller or by a Target. SDA can operate in either Open-Drain or Push-Pull configuration, depending on the bus state during bus transactions.