I2C communication !

[guizmo1967]

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 !

[mon2]

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.

[guizmo1967]

Re: I2C communication !

Ok thanks !

[mcplslg123]

Re: I2C communication !

Touchpad also uses I2C

[gabiz_ro]

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,