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Why does a DC voltage appear at VCCM_ANA when UART Tx is connected?

Question asked by MenelikB on Nov 25, 2015
Latest reply on Dec 29, 2015 by MenelikB


Notice the linker for the VCCM_ANA selection is at option C which is for external power supply selection. The probed voltage appears at every VCCM_ANA test point. This is giving me problems when trying to power my eval board from a power supply on a daughter board I designed. I have made efforts to follow the schematics for the EVAL board to setup the board for an external power supply operation. Why does DC voltage appear at VCCM_ANA test points? What is the proper setup to power the chip, AFE and GPIOs from an external power supply?