https://www.baldengineer.com/tag/serial-busRecent content in serial bus on Bald EngineerHugoen-USTue, 02 Apr 2024 21:23:47 +0000https://www.baldengineer.com/picking-i2c-pull-up-resistors-correctly.htmlThu, 07 Mar 2024 13:22:00 +0000https://www.baldengineer.com/?p=8909<p>A long time ago, I made a video suggesting math was unnecessary to determine proper pull-up resistor values. Like most generalized statements, that suggestion is not always true. For example, in data buses like I2C, speeds like 400 kHz and 1 MHz are common. At those speeds, the pull-up resistor and the bus capacitance form an RC filter that fundamentally limits the data transmission speed. Or. It limits the range of pull-up resistor values. In this Workbench Wednesdays video, I show how to estimate I2C bus capacitance, measure that capacitance, and pick pull-up resistor values.</p>