Some cosmetic remarks:
- Indicate voltage of each PL bank on its corresponding schematic symbol. It makes it way easier to verify the signal voltages.
- What's the OLED display type/part number? The diagram J14 says nothing about it.
- What's the purpose of J9 and J11? Please put some notes...
- Put info about I2C addresses next to each I2C chip.
- Place a table describing all addressable interfaces (I2C/multidrop SPI) in the root sheet.
- Place a clear explanation of power sequencing of the PSU.
- What are PB7/PB8 for? A note would be very helpful describing the purpose of these buttons.
- Please be consistent with reference designators, i.e. use only Uxxx or ICxxx, never both.