Floating PSoC | Cypress Semiconductor
For one of my projects I am designing a PSoC to measure current from a high side shunt. This shunt will see common mode voltages around 700 volts maximum.
I plan on tying the grounds of the PSoC to one side of the shunt and running the A to D in single ended mode relative to the floating ground. An isolated DC/DC converter will power the PSoC and logical isolators will keep the high voltage off the rest of the circuitry. I have an isolated USB hub if I wind up having to program with high voltage present.
This circuit will need to measure current in both directions. In SE mode, the A to D can only measure between 0 and the reference. How can I set the A to D up to use the lower half of the range to measure the negative voltage and the upper half the positive? This is if the converter were differential, only the input is single ended.