6 years, 10 months ago.

How to design wide voltage range digital input ?

I would like to design a board with digital inputs allowing between 2-36 V. Is there anyone who has done a similar thing or can think of a way ?

Thank you,


1 Answer

6 years, 10 months ago.

There are buffer IC's which allow for high input voltages, although not that high afaik. A simple solution is a quite large resistor + zener diode (something like 3.3V-4V zener). The bandwidth of that won't be very large, and 2V is then a bit doubtfull, it is probably detected as a high, but it isn't guaranteed. You could of course use AnalogIn's to solve that issue, but also that doesn't improve the speed.

Accepted Answer