Hi Damien, The issue may be the power supply. What is providing the 3.3V for the MSP430?. I don't know why switching PI5A23159 on would pull down the supply rail. Do you see the same dip in the VCC if you probe directly on the output of the power supply? Also, what kind of ground do you have between the MSP430 back to the power supply? Same question for the PI5123159? Is it small, thin ground traces or large ground pours?
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