it looks to be controlled over i2c, like the PMIC on a lot of other pi models
i believe the rpi firmware will talk to it over i2c and adjust the voltage as needed based on the current clock rate
so part of the answer then, is how well that chip can deal with noise on the 5v line
the original zero and pi1, behave a little differently, with that functionality built right into the SoC, but its still a switching regulator
and yeah, i cant see where 5V_CORE comes from either, they omit a lot from those schematics
Statistics: Posted by cleverca22 — Wed Feb 12, 2025 2:00 am