Summary

This application note shows how to quickly diagnose and resolve problems on common serial buses (I2C, SPI, UART/RS-232/485, CAN, USB, I2S/TDM, LIN, FlexRay) using the trigger, protocol-decode, and search capabilities of the MSO/DPO Series oscilloscopes. Readers will learn workflow and measurement techniques that reduce time-to-root-cause for protocol, timing, and signal-integrity issues in embedded system designs.

Key Takeaways

• Identify common failure modes for I2C, SPI, UART/RS-232/485, CAN, USB and other serial buses and map symptoms to likely causes
• Apply oscilloscope trigger and protocol-decode features to capture and isolate protocol-level errors and timing violations
• Use waveform search, history, and segmented-acquisition to find intermittent faults and correlate them with firmware events
• Diagnose signal-integrity problems (timing skew, ringing, improper termination, level shifting) and recommend practical hardware fixes

Who Should Read This

Embedded firmware and hardware engineers (with some experience in microcontrollers and serial protocols) and test/validation engineers who want faster, more reliable root-cause debugging of serial buses in product development or field troubleshooting.

Still RelevantIntermediate

Topics