I used buck converter to convert +48 input to +5 (the plus and minus -48V is switched to +48) to power a microcontroller. suppose i want to use digital input of the microcontroller to detect +5V, i suppose there would be some ground reference problem. should i isolate the input or is there another way to convert -48volt to +5volt ?
- - - Updated - - -
i mean the +5 volt i want to detect with microcontroller is from external sources, which have the same reference ground from -48 volts