B@tto 51 Posted September 13, 2016 Share Posted September 13, 2016 Hi guys, I have a simple problem (I hope) : I have designed a custom board with a TM4C123, and I implemented a simple USB port with a linear regulation on 5V to generate 3.3V for the MCU. As there is another source of power on this board for 3.3V, I added a schottky diode to prevent short circuits between supplies. My problem is when I power my board with USB, It doesn't start, but with the main supply it's okay. I checked voltages : from main = ~3,3V and from USB = ~3V So I guess that 3V is not enought. What can I do against that ? I tried unsuccessfully to disable BOR but I'm not sure at all of what I tried (not a lot of information on the web). My IDE is Energia but as it's not a problem directly link to it, I posted here. Thanks Quote Link to post Share on other sites
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