Hi. I am looking for a solution to measure currents in two AC/DC lines. Measurement must be isolated between each other and the real thing I am interested in is to detect a change in a current (for fault detection), so I do not really care if I measure maximum value or RMS (but still, true RMS would be nicer).
In TI catalogue, there is ADE7912 (ADE7913) which is an isolated ADC and seems to be designed for purposes like this. However, as far I understand it doesn't provide any operations like Mean Square calculation. For 50Hz I would have to sample minimum couple hundreds of times per second and do some interpolation, than integration and squaring for RMS, which I think would be and overkill for my microcontroller.
Do you know any other chip that provide isolation and calculate RMS on its own or know some example code for any cheap, popular microcontroller that I could place between main uc and adcs to handle sampling and rms calculation?