The SAMA5D27-SOM1-EK1 schematic shows it uses a triple output regulator. Since we are intending to power the VDDSDHC with 3.3v, not 1.8v on our custom SAMA5D27-SOM1 board, we can do away with the 1.8v regulator output. Is it necessary to have VDD_IN and VDDSDHC on separate 3.3v power rails? Are we safe to use a single 3.3v output regulator to power both VDD_IN and VDDSDHC and some other peripherals?
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Found the answer.
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Power Supply Configuration #1 The SAMA5D27 SOM1 is supplied by only one main supply. In this configuration mode, all supplies are connected together and supplied by the main 3.3V supply. All PIOs have VDDIN_3V3 Power Rail as voltage reference.
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