PFE passive filter

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PFE passive filter

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jorgevazquez
Contributor II

Hi everyone I´m new using KL25 board and i´m using code warrior and i got a question how does the passive input filter works? in this microcontroller, is filtering high frequencies?or is a band pass filter

I hope you can help me.


Thank you for reading.

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Paul_Tian
NXP Employee
NXP Employee

This filter is not the traditional filter. It is not high frequencty filter nor band filter. It can looks like a pulse counter. It will delete small width pulse. So it looks like a filter.

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jorgevazquez
Contributor II

Thanks for your answer, yes it help me to understand this filter thanks for your time

Best regrads.

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Monica
Senior Contributor III

Hello Jorge,

Did that statement help you out?

We'd like to know!

Best regards,

Monica

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FredericoLuiz
Contributor II

Hello Monica Arvizu,

I searched for more detailed information about this Passive Filter but I didn't find  helpful information. The only thing I saw is:

"These pins have a passive filter enabled on the inputs. This is the shortest pulse width that is guaranteed to be recognized."

But I would like to know more about this filter, maybe they could improve my application for reading a keyboard. I'm using a KL05Z32.

Thanks,

Frederico

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1,452 Views
Paul_Tian
NXP Employee
NXP Employee

This filter is not the traditional filter. It is not high frequencty filter nor band filter. It can looks like a pulse counter. It will delete small width pulse. So it looks like a filter.

1,451 Views
hajianik
Senior Contributor I

Does it replace software debounce?

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kora
Contributor II

Is there any more detailed information on the passive filters for GPIO Pins to be found somewhere.

I'm using a Kinetis K64F and have looked through the available Reference Manual and Datasheet but detailed information about this functionality is very sparse?

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