Notes on I2C
The article, published on Lobsters, offers a detailed overview of the I2C protocol. It begins with the historical context of I2C's development by Philips in the 1980s, then delves into the electrical specifications, including pull-up resistors and bus capacitance. The author explains the protocol's two-wire architecture (SDA and SCL), addressing scheme (7-bit and 10-bit), and data transfer frames. Practical sections cover clock stretching, arbitration, and common pitfalls like bus contention. The article also includes debugging advice using oscilloscopes and logic analyzers, and references to official NXP documentation. No specific prices or dates are mentioned, as the focus is on technical education.
I2C remains a fundamental protocol for embedded systems and IoT devices.