I'm working on a P4 module which I want to use 1.8V external flash with (full voltage range: 1.65V-2.0V)
The problem with VDDO_FLASH is that it outputs 3.3v before burning a fuse, so in order to use it one has to have some open jumper, then burn the fuse, them solder the jumper shut - it makes manufacturing more difficult.
Instead of doing that or using an external LDO, would there be any reason not to use VDDO_PSRAM instead (in addition to using it to power VDD_PSRAM_0/1)? It seems to output 1.9V and up to 50mA.
Esp32 P4: powering external 1.8V flash from VDDO_PSRAM?
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