topic Re: PFE passive filter in Kinetis Microcontrollers

PFE passive filter

jorgevazquez — Sat, 06 Apr 2013 18:45:18 GMT

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.

Re: PFE passive filter

Paul_Tian — Thu, 18 Apr 2013 09:02:04 GMT

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.

Re: PFE passive filter

Monica — Wed, 24 Apr 2013 23:32:41 GMT

Hello Jorge,

Did that statement help you out?

We'd like to know!

Best regards,

Monica

Re: PFE passive filter

jorgevazquez — Thu, 25 Apr 2013 13:54:32 GMT

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

Best regrads.

Re: PFE passive filter

kora — Mon, 16 Mar 2015 11:48:55 GMT

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?

Re: PFE passive filter

FredericoLuiz — Thu, 23 Jul 2015 19:31:26 GMT

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

Re: PFE passive filter

hajianik — Mon, 22 May 2017 19:14:18 GMT

Does it replace software debounce?