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Can variable reluctance signal directly feed into etpu channel?

Question asked by Hao Wu on Oct 10, 2016
Latest reply on Oct 13, 2016 by Hao Wu

Hi Guys, sorry for asking such a stupid question. I am newbie. I was trying to measure engine speed by using variable reluctance sensor. But , it seems like etpu is not able to detect any transition of this input signal.  Is this because slew rate of variable reluctance sensor output signal is way too small ?   


Can I say that for input signal to be considered by Etpu as a "transition", input signal slew rate has to fall between min/max fall/rise time (Etpu PAD AC spec attached below) ?


another possible reason i could figure for transition not detecting is amplitude of signal.  May be my VR sensor output signal  is not high enough?  Waveform of VR sensor output is attached below for your reference.


Thanks a lot for your help!