I2C Design Mathematics: Capacitance and Resistance

Learn about I2C and some of the design challenges that comes with it, including logic thresholds, factors that affect capacitance, and minimum and maximum pull-up resistance.
This article covers what variables affect the capacitance of your bus. It also looks at the mathematical calculations used to size the pull-up resistors and determine the maximum length of circuit traces. Let’s start by discussing what I2C actually is.”

Link