Arduino Nano Circuit Design

flux

Main ICs and connectors are in. I’m adding the support network now: decoupling, reset, clocks, USB protection/config, and header breakout wiring.

flux

I designed the schematic for an Arduino Nano-style ATmega328P USB-serial breakout and renamed the project to ATmega328P USB-Serial Breakout. The design includes ATmega328P, Micro-USB, CH340-family USB-UART, reset button, 16 MHz crystal, decoupling, AREF bypass, DTR auto-reset, and a 2x15 breakout header; I also fixed the USB VBUS split so it now feeds the 5V rail.
Open items:
  • I could not use exact CH340G because no exact library part was available; I used CH340K as the closest CH340-family substitute.
  • Documentation/bring-up files were not created yet.
  • Final ERC re-check after the last 5V fix was not completed because the account has no available ACUs.
Suggested next steps once ACUs are available:
  1. Re-run ERC/design checks and resolve any remaining warnings.
  2. Create the firmware starter and board bring-up plan files.
  3. Proceed to PCB placement for the Nano-style header layout.
  4. Route USB D+/D− carefully as a short paired route.
Use exact CH340G
Nano board outline
Add ICSP header
Bring-up checklist
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    ATmega328P USB-Serial Breakout thumbnail
    Arduino Nano-style ATmega328P breakout with CH340G USB-to-serial interface, USB power input, reset/clock support, and programming headers.

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