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MAX232: Communication issue of MAX232

Harry Ma
Intellectual 2200 points
Part Number: MAX232

Tool/software:

Hi Team

The  RS232 chip (model MAX232DRG4) is used in the inter-board communication of charging pile products. Customer found an inter-board communication failure occurs when some piles are charged on-site. The fault is eliminated after stopping charging (i.e., RS232 does not communicate).

They wanna curious if you can give some insight what next step they can do to figure it and find why?

They test the communication waveform, it looks ok and don't found issue in lab.

Thanks!

  • 0
    TI__Expert 7946 points

    Hi Harry, 

    Initially this sounds like an interference issue. I wonder if surrounding lines are coupling to the RS-232 bus. I have a couple questions and next steps:

    • Can you send the schematic and layout?
    • Can they probe the RS-232 bus with and without charging taking place?
    • Probing the ROUT and TIN pins with and without charging would also be beneficial to know. 

    Regards,

    Ethan