Digital inputs

[Archilochus]

The .25 Vdd and the +0.8 thing I read as...

"For the full operating voltage range (not just 4.5 to 5.5 volts), the Vin HIGH minimum spec is (Vin*0.25) + 0.8 volts"


The Schmitt trigger input specs are 0.8 Vdd, or Vdd * 0.8, not .8 volts - this value seems kind of high to me...

Note that those values are the minimums, not the typical (unspecified) or maximums.

Arch

[Christopher4187]

I need to revisit this question for a moment. Speaking specifically about the 16F688, I am using pin RC3 as an input and I have ansel=0. The code is really simple in that once the input goes to 1 (If sensor=1 then......), then it lights a light. Everything works fine but I wanted to get the threshold voltage a little lower. Right now, it triggers around 1.2VDC. I looked at the datasheet again and it is inconclusive to me if I am using the correct pin. I know it mentions voltages that are .8VDC and some that are 1.2VDC. I can use any pin on the 16F688 but can someone tell me which one, if any, will trigger at .8VDC. I probably overlooked something in the datasheet (I referred to section 14) which is why I am writing this question.

Thanks,

Chris