PIC input low/high voltage level of limit.

[Peet19]

Hi all!

I would like to ask, how at what voltage level does the PIC detect the input as low? Full VSS (0V) or a little higher? For example 0.8V or something like that.

Thank you in advance for your help!

 

[Nigel Goodwin]

Hi all!

I would like to ask, how at what voltage level does the PIC detect the input as low? Full VSS (0V) or a little higher? For example 0.8V or something like that.

Thank you in advance for your help!

Look at the specs in the datasheets - they give minimum and maximum values for both high and low, and also for when the pins are set as Schmitt trigger inputs as well as TTL. It probably varies a little between different PIC's, but something like 0.8V would tend to be the lower limit of tolerance.

It's pretty well the same as most other logic devices.

 

[Les Jones]

You will find maximum voltage that will be considered as a logic zero and the minimum voltage that will be considered as a logic one in the electrical specification section of the data sheet for the particular PIC that you are using. If you want to detect a specific level then consider using a comparator input. (Assuming your PIC has a comparator module.)

Les.

 

[Peet19]

I understand, thanks. I searched for it. Is this what you mean? (in the attach)

 

[Les Jones]

Yes.

Les.

 

[Peet19]

OK. Thank you.