So.... I have a project where I have a 0.3v to 5v signal (output of a resistor ladder switch) that I need to use as a wake interrupt for a pic (INT0/1).
I'm have a few options on how to do this... buffer the signal, hook it to a mosfet, diode, etc. But, I'm having trouble figuring out a "right" way to do it.
The trouble is, it may occasionally be below the logic of the pic (it'll read it as 0 anywhere below 2v) AND I absolutely can not effect the voltage at all (on the rest of it's circuit). I can sample but that's it. One other consideration is that I would really like to keep the entire circuit as low current as possible in while in sleep mode. Which means if I have to run the 5v regulator and a buffer circuit for this wire it's probably not worth it. However, if I could directly hook this circuit to the regulator so that whenever not zero volts was on that line it would trigger my regulator to be on that would be swell.
Any suggestions? Thanks!
I'm have a few options on how to do this... buffer the signal, hook it to a mosfet, diode, etc. But, I'm having trouble figuring out a "right" way to do it.
The trouble is, it may occasionally be below the logic of the pic (it'll read it as 0 anywhere below 2v) AND I absolutely can not effect the voltage at all (on the rest of it's circuit). I can sample but that's it. One other consideration is that I would really like to keep the entire circuit as low current as possible in while in sleep mode. Which means if I have to run the 5v regulator and a buffer circuit for this wire it's probably not worth it. However, if I could directly hook this circuit to the regulator so that whenever not zero volts was on that line it would trigger my regulator to be on that would be swell.
Any suggestions? Thanks!