I2C communication !

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  • guizmo1967
    Senior Member
    • Sep 2022
    • 75
    • Canada
    #1

    I2C communication !

    Hello,

    I would like to know on average how many chips in a laptop uses the I2C protocol to communicate and which one.

    I know the battery, BQ24735 and the ITE uses SDA and SCL but is there other chip that do ?

    And the SDA, SCL pins always needs to be pullup to 3.3V, no matter what if the laptop turns on or not, right ?

    Thanks !
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14042
      • Canada
      #2
      Re: I2C communication !

      No firm answer and will vary with the board design.

      I2C and smbus are similar. Both are open-drain pins so the pull-up voltage can also vary to suit. For example, can be 5v, 1v8, etc.

        Comment

        • guizmo1967
          Senior Member
          • Sep 2022
          • 75
          • Canada
          #3
          Re: I2C communication !

          Ok thanks !

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: I2C communication !

              Touchpad also uses I2C

                Comment

                • gabiz_ro
                  Senior Member
                  • Mar 2011
                  • 167
                  • Romania
                  #5
                  Re: I2C communication !

                  There are many more, most used
                  RAM module for SPD
                  Internal display for EDID
                  External display (VGA,HDMI) also for EDID
                  Also some others like
                  some axis accelerators,others sensors,battery management,backlight control,

                    Comment

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