Providing negative value to an analog pin in PSoC

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Anonymous
Not applicable

 Hi all,

   

At the moment I am trying to provide a negative value to a comparator positive input pin, so the comparator output will be triggered high once a negative voltage goes lower than this defined threshold.

   

Unfortunatelly it looks like the PSoC does not accept a negative signal. I have checked this with scope and anything that goes below 0 Volts just disappears from the input signal.

   

Am I doing somethign wrong or this is, in fact, the way it is?

   

Thanks.

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1 Solution
Bob_Marlowe
Level 10
Level 10
First like given 50 questions asked 10 questions asked

No input signal may be lower than GND on a PSoC. Use an R-ladder to shift the signal into positve Voltage.

   

 

   

Bob

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