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AON header should have +VAON, not +1.8V #7

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thatoddmailbox opened this issue Jan 25, 2021 · 1 comment
Open

AON header should have +VAON, not +1.8V #7

thatoddmailbox opened this issue Jan 25, 2021 · 1 comment
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affects rev 1 bug Something isn't working

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@thatoddmailbox
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Currently, the AON header's first pin goes to +1.8V. This made sense for the FE310-G000, but on the G002, the AON power domain voltage was changed to +3.3V. While the rest of the board was changed to allow a selectable AON voltage via J1, it looks like I left this fixed at +1.8V.

This isn't a major issue, it's just confusing if you're using the G002.

@thatoddmailbox
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Unfortunately, the AON pin header is in the path that the FE310 gets its main +1.8V power source from, which makes this annoying to bodge. You would most likely have to cut both traces going to J5 and run a bodge wire from U2 to R4. Then you could run another wire (under the board?) from +3.3V (which is conveniently available from J2) to J5.

Alternatively (and more correctly), you could run that second wire from J5 to R5, which would give you the AON voltage as selected by JP1. However, since you'd only have to do this modification on a board with a G002, in which case you'd know +3.3V is the AON voltage, I'm not sure that it makes a huge difference.

@thatoddmailbox thatoddmailbox added the bug Something isn't working label Jan 25, 2021
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