I plan to use the ADE7878 as a 3-phase meter, with the AC input power supply being 230V. After studying the evaluation board, I used it as the basis for my circuit design. I developed two power supply systems: First, I supply the ADE7878 via a transformer (230VAC/5VDC) and then via another DC-DC converter module with 3.3 V DC. Via a separate line, I use a DC-DC converter that generates 5V and serves as galvanic isolation to supply my MCU (Raspberry Pi). Here, too, I use a DC-DC converter module with 3.3 V DC to supply the isolator. Is my idea for this setup correct? ( see circuit diagram in the attachment).
I am not sue if the ground of the neutral should be connected to the ground of the transformer.
I am also concerned about the coupling of the insulators.
Are my circuits correct with regard to the I2C interface and the PM0 and PM1 pins?
Can I leave the other pins (CF1-3, SPI pins) unconnected?
I intend to use the I2C port for the communication interface. Can anyone help me with these questions?