I have a really simple power input network like so:
The SMPS will power analog devices with +12V and the regulator will regulate the rest downstream to power digital circuitry with +5V. Additionally, I have two sense terminals on the board that will take measurements of an attached load. The - terminal is connected to ground with everything else. This throws a wrench in my workflow with respect to reverse polarity protection at the sense terminals. If I hook up something in-between 5 and 12 volts or maybe higher on the negative side, I'm afraid my current setup wouldn't be enough and it could damage chips. Should I consider placing a barrier diode on the OUT side of the regulator as well? What are your layout recommendations in regards to protecting against a positive voltage scenario on the - sense terminal?
Thanks in advance.
Edit: I've added more of the schematic for clarity.