1.7.9 PIC32CXMTC + MCP3914, PGA = 4, CH0: I_A, CH1: I_B, CH2: I_C, CH3: I_N, CH4: V_A, CH5: V_B, CH6: V_C, CH7: V_D

AFE_SELECTION = 0x00000005

AFE_CTRL_0 = 0x05002492 (dithering: on, minimum strength; boost: x0.66)

CHANNEL_MATRIX = 0x75316420