Is the TravelLogic series logic analyzers helpful in finding the I²C signal problems if the TravelLogic only capable of measuring digital signal?

When stacking the TravelLogic logic analyzer with a DSO, the logic analyzer software displays the digital and analogue waveform on the same window; this helps the user compares the digital waveform and analog waveform at the same time. The user can also save the digital and analog waveform as a file to share it with others by the software (LA Viwer).

Acute Logic Analyzer - Stack with the Tektronix MSO:
Acute Logic Analyzer - Stack with the Agilent DSO:

How can I capture more I²C data?

The TravelLogic has the transitional storage to record the I²C signal up to nearly 3,400 seconds; it will increase the recorded data for the embedded memory buffer.

Acute Logic Analyzer - Transitional storage capture longer than normal storage:

How come my logic analyzer never capture the I²C data I am interested?

You should use the I²C trigger to capture your wanted I2C data; the I²C trigger needs you to set some specific conditions like Address or Data to start capturing (trigger) data fit into your conditions.

Links to: I²C Application Note

I see many non-meaningful noises when capturing the I²C signal, what should I do?

The non-meaningful noises arise from slow-moving and bouncing I²C signal with one threshold voltage to determine logic low or logic high. The TravelLogic series logic analyzer offers the Schmitt circuit with two threshold voltages (voltage-high, voltage-low) to filter such noises.

Acute Logic Analyzer - Stack the Agilent DSO to measure I²C with Schmitt circuit:

Can I use the I²C trigger for SMBus/PMBus signal?

Yes! Set the I²C trigger with the converted SMBus/PMBus parameter; the I²C trigger is available for any signal based on the I²C protocol.

Is there any applications for the I²C trigger?

Yes! Please refer to the I²C application note provided by Acute Technology Inc.                               

Links to: I²C Application Note

The I²C circuit may crash sometime; can I view the waveform after the crash?

Yes! Please use the Width trigger to trigger when the clock or data does not transit over a specific time; use the transitional storage to see more data if needed.