>I only need to be able to monitor three currents and perhaps one voltage; will a polyphase design do that OK? Better modify single phase design - just copy/paste current measurement circuit & code. >Also, what is the rationale for using two processors in some reference designs Most probably those designs demonstrate low-end frontend microcontrollers, but reference design without display is not that good design. - That's why second microcontroller. IMHO. You can get away with msp430ixxx series with SPI OLED display
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