Noise EMI on JN5169

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Noise EMI on JN5169

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nguyenanhgiau10
Contributor IV

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!

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vicentegomez
NXP TechSupport
NXP TechSupport

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

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nguyenanhgiau10
Contributor IV

Hi vicentegomez

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

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vicentegomez
NXP TechSupport
NXP TechSupport

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 ....

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