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Choosing UART, SPI, or I2C
A side-by-side comparison and a decision framework: pick by speed, device count, pin budget, and distance, and know when none of the three fits and you need CAN or RS-485.
18 min read
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You need to drive a fast color display. Which bus and why?You have a board with eight sensors, an EEPROM, and an RTC, and very few free pins. Which bus?How does pin count scale differently across the three buses as you add devices?Why are UART, SPI, and I2C all poor choices for sending data across a machine or vehicle?In practice, how do you decide between two buses when either could work?
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