I have a scenario, where
device A provides 24V,
device B converts 24V to 3.3V and feeds it back to
device A. Both devices communicate with TTL (@3.3V), so we have 2 signal lines as well. What circuit is required so that I can safely plug
device B in or out while device a is powered and so that I'm not limited to connector types that are hot-plug-safe.
Also there is no requirement to limit inrush currents, because all inputs have low capacitances and the 24V rail may drop. I know there are ICs for hot swap circuits, but they are quite overpowered and I prefer a circuit consisting only of passive components.
Does something like the following circuits make any sense (using diodes like for esd protection)? From my understanding, the act of connecting two devices is simmilar to an electrostatic discharge in some way.
Block diagram of TPS54240 :