Noise EMI on JN5169

[nguyenanhgiau10]

I working on Smart Switch ZigBee device with a switch-mode power supply and I facing with a big problem - noise EMI.

My device include: power supply + relay below and MCU above.

I can control LightBulb, but when I control electric fan, it make my system hang and watchdog can not work. I have to turn off power and re-supply to fix it.

What should I do? Using shield or anything else?

Thank you so much!

[vicentegomez]

If you can share your schematics/ gerber I can check it and make some recommendations.

If you have a relay I am thinking you have two different voltages, one for the digital and other for the power, but is it a AC voltage? Do you have enough capacitor on VDD?

Thanks

[nguyenanhgiau10]

Hi vicentegomez‌

You right, I have 2 different voltages. You can check it in attach file.

[vicentegomez]

Can you share the part where is the JN device?

H1 to H4 comes from the JN?  do you have more protection or just the resistor r15?r17 ....