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Hi expert,
My customer is using LIN to receive frames with interrupt enabled. They are facing EMI issue when nearby pins are doing EPWM output.
1. Pin 54 and pin 52 here are EPWM output, and pin 53 is LIN RX.
2. EPWM output with frequency of 170K to 200K, LIN receive at an interval of 50ms
3. Signal on LIN RX is normal in scope (turn on EPWM and turn off EPWM will get almost the same waveform)
4. If turn off EPWM output on pin 52 and pin 54, LIN receving will always come to interrupt for receiving (doing well)
5. If turn on EPWM output on pin 52 and 54, LIN receving interrupt will sometimes not enter.
6. If mapping LIN RX to some other pin far away, there will be no issue.
In error cases, we can find receving register in LIN module in not updated.
Could you give any explanation or suggestions on this?
Thanks
Sheldon
Sheldon,
Regards,
Cody