Yi Bao Guan

Unusual question of the electricity on imx258

Discussion created by Yi Bao Guan on Jun 3, 2011

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.


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?