I’m looking to build a very low power PIR circuit and I need an analog comparator. I could use a dedicated low power op amp chip for the comparator and output that to a 328P, or I could use the analog comparator internal to the 328P.
I read about the analog comparator in the datasheet (p243 overview and p51 for minimizing power consumption), but I’m not sure what type of current draw I can expect from the 328p if I used the comparator in the chip. Number of components is irrelevant, I would like to know what to expect for current draw on a full sleep for the 328p with only the comparator active until the comparator causes an interrupt when motion occurs. Or is there a better way to accomplish this? Thanks in advance.