STM32G4 and F4 MCU Design Blocks

[rishabhroyy]

Changes

Misc

• Hide Digikey labels in stm32-test project schematic
• Created CAN_TRANSCEIVER Design Block

Changed decoupling capacitor layout

• Removed duplicate 10uF capacitors, reference schematic only has 1
• Changed the layout/wiring of the capacitors
• Added a 600 Ω @ 100Mhz Ferrite Bead from Digikey between VDD(s) and VDDA (the reference schematic from STM had it)
• I'm 99% sure I did it right but I'd really appreciate it if you could double check it

Questions

• I couldn't find a button that's exactly the same as ours, but I did find a similar one with J-leads that is 6mm by 6mm. Should I change it out?
  • https://www.digikey.com/en/products/detail/e-switch/TL3301AF160QJ/1144799
• "The unused clock source should be disabled and the unused I/Os should not be left floating. The unused I/O pins should be configured as analog input by software; they should also be connected to a fixed logic level 0 or 1 by an external or internal pull-up or pull-down or configured as output mode using software."
  • Should I do something about this? Like ground every unused pin?
• "Might be worth including a solder bridge pad for a 0-ohm resister that ties it to ground in case we ever want to change that, but honestly I can't see us needing to."
  • It has a resistor to ground, so I'm guessing you mean solder pads for a resistor to +3V3, and I decided to not add it, because after reading the STM pdf I see why you said we'd probably never use it, so it'd probably be unnecessary, but if you actually want me to add it lmk.

[fezboy]

Functional:

• What aspect does the wildcard at the end of each MCU part number affect? should we specify it?

Ordering:

• Bead, Crystal, Debug Header, and reset button need specific part numbers in the Value field
• Add a Digikey Link field to each part. (Digi URL)

Aesthetic

• Boot pulldowns should be wired directly

Aesthetic nits

• Nets that jump across the page should be labeled with flags (it's ~ fine ~ here but I want to keep my notes consistent.
• VSS pins can (should) share ground labels
• Wires shouldn't come out of pins at an angle, have a bit of wire coming out before you turn (VCC pins, crystal) The main thing with this for me is the green dot overlapping with text

[fezboy]

Aesthetic:

• Crystal Frequency should be indicated on schematic, a text note next to it would be good (Sorry I should've specified this on my previous notes)
• Global labels should indicate direction, for example, UART_TXshould be an output at the microcontroller and an input at the debug header.

Aesthetic Nits

• It would be a good idea to set pin functions for the pins you're using, especially as it can serve as a hint to users of the design block to do the same. (https://docs.kicad.org/9.0/en/eeschema/eeschema.html#alternate_pin_functions)
• You have room to give these caps more space, I think it could make the text easier to read

• This should probably be a straight horizontal line, for simplicity and so that it doesn't block PB1.

[fezboy]

Part number doesn't match here

[bvngee]

One tiny thing, could you rename UART_TX/RX to VCP_UART_TX/RX, to differentiate in case someone uses another UART?