The first picture, Vout is the voltage of CPU pin 3.3V, Iout is the current of CPU pin 3.3V.
Before power-on, 3.3V remained on circuit board about 200mV, after power-on, the oscillograph captured current 2.7A consumed. Power system detects abnormal current to enter the protected status while closing output.
Question:
1. why the residual voltage can cause CPU's NVCC_XXX (digital terminal) current consumption so much
2.What is the residual voltage, the system will not consume high current?
3.What better way to avoid this anomaly?
