I noticed this part on the guide for various M4 Adafruit boards:
I wanted to provide a stable and accurate external reference voltage to the DAC, but then I read this.On the Metro M4, at least for now, AREF is tied to 3.3V due to a silicon v0 bug that does not allow the DACs to work unless AREF is connected to 3.3V. You cut the bottom jumper if you need a different AREF voltage but note that this may change DAC range!
Is this a hardware "bug" or something in the bootloader that has been/will be fixed?
I also have another question (assuming that bug has been fixed and AREF can be used) :
I read on the datasheet that
checking with my multimeter VDDANA/VDD, I get 3.25V. If I use a precise 3.3V voltage reference for AREF, this will be higher than VDDANA. So do you think I should use a lower voltage reference? Or maybe I can tie VDDANA to the voltage reference too?The DAC voltage reference must be below VDDANA
thank you!
Dimitri