Bus Activity States provide a mechanism for the Controller to inform the Targets about the expected upcoming levels of activity or inactivity on the Bus, in order to help Targets better manage their internal states (e.g., to save power). There are four Bus Activity States, each with an expected activity interval:

  • 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
FAQ Type: 
I3C