The I3C bus activity states provides a mechanism for the Master to inform the Slaves about the expected upcoming levels of activity or inactivity on the bus, in order to help Slaves better manage their internal states (e.g., to save power).
The four activity states (and their expected activity interval) are:
- Activity State 0: Normal activity
- Activity State 1: Expect quiet for at least 100 µs
- Activity State 2: Expect quiet for at least 2 ms
- Activity State 3: Expect quiet for at least 50 ms