topic Re: Minimum input voltage for edge capture in Kinetis Microcontrollers

Minimum input voltage for edge capture

zorrotz — Tue, 04 Mar 2025 12:04:41 GMT

Hi,

In a KV4X, for a digital input, input voltage high is 0.7 x Vdd and input voltage low is 0.35 x Vdd.

Which are the minimum and maximum values for edge capture?

I have a sinusoidal signal of 200 mV peak in an input pin and I see that it is enough to detect falling/rising edges.

Thanks in advance

zorrotz — Tue, 04 Mar 2025 12:35:35 GMT

I have forgotten to say that Vdd = 3.3 V

EdwinHz — Wed, 05 Mar 2025 18:17:13 GMT

Please maintain the edges of the captured signal between 0.7 x Vdd and 0.35 x Vdd in order to ensure a proper edge detection of the signal.

zorrotz — Wed, 12 Mar 2025 06:18:42 GMT

I have found why edges were being detected with such a low signal.