GPIO noise issue

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GPIO noise issue

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Bhuvana
Contributor I

MCU:FS32K144UAT0VLLT
100LQFP

How to remove noise in the GPIO input pins and how to use digital filter and passive filter what it will do exactly? I have enabled digital filter and system clock is FIRC.

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JRoberto
NXP TechSupport
NXP TechSupport

Hello @Bhuvana 

That depends on your signal conditions and the source of the noise.

The passive filter is just an internal resistor but it's not always available. Refer to the device data sheet for filter characteristics. You will found a table that indicates if the Passive filter is enabled.

JRoberto_0-1661511016409.png

The Digital filter will introduce delay in your signal. So in case the noise you mention is generated by a push button (That creates a bounce in the signal). Then digital filtering might be able to help you.

You can refer to the thread linked bellow to see some configuration details.

Solved: Re: using digital filter on external interrupt pin... - NXP Community

Best regards

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