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Protecting inputs from high voltage

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I should have added Analog inputs. Imaging your working with a breadboard connecting jumpers with mV analog inputs but also have some high voltage stuff around. You don't want to fry your Launchpad when a stray wire touches the wrong voltage. Maybe a zener diode and fast blow fuse?

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You could potentially add some clamp diodes between the analog input and the two supply rails. We do this on the larger controlCARDs but space was limited so we omitted these on the LaunchPad. The part we use on the F2802x controlCARD is NUP4201MR6:



These will stand up to a little abuse, but they are really designed to protect the pins from ESD. If you put 50 volts on one of the LaunchPad pins you WILL fry the board.

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