I am working on the redesign of a 3-phase e-meter. I am thinking to opto-insulate the PDI interface, in order to debug the board even when connected to the power grid.
The current board already mounts the Si8602AC insulator for an I2C port, and I wonder if I can use the same for PDI as well - with PDI.CLK as SCL and PDI.DAT as SDA. Apart from the pull-up resistors, not needed, PDI and I2C seem quite similar from the electric point of view.
The problem could be how to give VTarget to the debugger, but this can be easily solved.