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Problem of pick up | Cypress Semiconductor

Problem of pick up

Summary: 1 Reply, Latest post by danaaknight on 02 Jul 2015 07:48 AM PDT
Verified Answers: 1
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user_94391782's picture
101 posts

I am using PSoC CY8C001 kit for counting pulses in window 1V to 2.5V. When the pin is ground it dsnt pik up..but when left stray counts go beyond 20000! what could be the issue?

i have changed many pins and checked, even decreased and increased time of counting.

user_14586677's picture
7646 posts

The input Z of an analog input is very high, therefore when left

floating very susceptable to picking up noise, power line induced

frequency, etc.. via start C coupling to pin.


Either terminate with a R to lower input Z when not connected to

anything, or ground input to comparators with a mux.


Regards, Dana.

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