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ISO1050: Communication waveform issue

Dillen Chen
Intellectual 2820 points
Part Number: ISO1050

Hi, Team,

In customer application, three CAN in parallel, Protection circuit in the picture × 3. The communication waveform slew rate is extremely slow, how can we optimize it?

  • 0
    TI__Mastermind 29595 points

    Hi Dillen, 

    Thanks for reaching out and promoting ISO1050. The waveform shown (I am assuming this is CANH or CANL) looks capacitive. Typically, TVS diodes have some load capacitance spec. I would recommend removing the TVS diodes and see if performance improves. If it does, then select a diode with less capacitance.

    If this is the case, then please see TI's TVS diodes product selection. Feel free to open a new thread to confirm, but TSM24CA is a low capacitance diode for industrial CAN (with automotive spin in preview) that may be better suited for the application. 

    Best,
    Andrew