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ISO6721-Q1: Communication issue with ISO6721

Devin Hu
Prodigy 70 points
Part Number: ISO6721-Q1
Other Parts Discussed in Thread: ISO6721

Tool/software:

Hi TI Teams

Schematic Prints.pdf

We use ISO6721  between High and Low voltage side MCU(TI MSPM0G3507SR) uart port,and sometims the uart abnormal.

If we want to add a RC filter in OUTA/B port of ISO6721,what`s the TI recommended? The uart frequency is 11.592KHz.

Is there any limit of port capacitor load?

Best regards!

  • 0
    Guru 286180 points

    Why not add the filter at the inputs?

    As a rule of thumb, for digital signals, the corner frequency of the LPF should be ten times the signal frequency.

    The outputs are rated for 1 mA at low supply voltages. It is usually no problem to choose a combination of R and C that does not exceed this.