Updated in schematic component:
- Renamed remaining wrong terminals:
PB5 pin 6 -> VCC, VIO33 pin 7 -> PB5, EPAD / Exposed Pad -> EPAD.
- Set all 21 terminals with datasheet-based Section, Terminal Order, Pin Orientation, Pin Type, and Pin Description.
Terminal Order / Section / orientation changes:
Power, order 1: VCC, orientation Top.Reset/Debug, order 2: PC0-NRST, PB6(SWDIO), PA2(SWCLK), orientation Left.Clock, order 3: PC1-OSCIN, PB7-OSCOUT, orientation Left.Communication, orders 4–6: SPI/I2C/USART-capable GPIO pins, orientation Left.GPIO, order 7: PB2, PB0, orientation Left.Ground, order 8: VSS, EPAD, orientation Bottom.
Footprint check result:
- Matches datasheet QFN20-EP intent: 20 perimeter pads + center exposed pad, 0.4 mm pitch, 3×3 mm body, 1.7×1.7 mm exposed pad.
- Footprint issue / uncertain: Flux layout also shows 4 extra unnamed internal pad nodes, likely paste/mount sub-pads, but they should be manually confirmed as non-electrical paste features.
Short summary:
- OK: datasheet pin count and main pad geometry match.
- Renamed: 3 terminals.
- Uncertain: EPAD electrical tie to VSS is not explicitly confirmed in extracted datasheet text; 4 unnamed internal footprint pads need manual confirmation.
- Footprint issue: no blocking mismatch found, only the unnamed internal pads require review.