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#Goal

- Design a Raspberry Pi Pico-compatible board that replicates the Pico’s core functionalities. The board will include the RP2040 MCU, external QSPI flash (W25Q16JV or W25Q32 as available), a 12 MHz ABM8-272-T3 crystal with low ESR (<100 Ω), a buck-boost 3.3V supply using the RT6150B-33, USB data/power connectivity (Micro‑B or USB‑C) with integrated PTC and USB ESD/CMC and common-mode choke protection, BOOTSEL and RUN buttons for mode selection, a SWD debug header, and dual 2x20 GPIO headers. The design follows best practices, ensuring proper decoupling with nearby 100 nF caps, correct crystal load capacitance, and complete net connectivity as defined in the Pico board datasheet and Pico 2 W schematic.

#Implementation plan

1. Add and configure core components:

1.1. Place the RP2040 MCU symbol and footprint.

1.2. Select and add the external QSPI flash (using W25Q16JV or W25Q32 based on availability) and connect it to the RP2040 QSPI pins.

1.3. Place the 12 MHz crystal (ABM8-272-T3) along with appropriate low ESR load capacitors.

2. Implement the power subsystem:

2.1. Add the buck-boost regulator RT6150B-33 to provide a stable 3.3V supply from the VSYS/USB.

2.2. Insert decoupling capacitors (100 nF ceramics placed within 5 mm of VCC/GND pairs) and required bulk capacitance.

3. Establish USB connectivity and protection:

3.1. Add a USB connector (choosing Micro‑B or USB‑C based on design preference) and connect VBUS and data lines (D+ and D-).

3.2. Integrate a PTC resettable fuse on the USB VBUS line.

3.3. Include USB ESD protection devices and a common-mode choke on the D+/D- lines for signal integrity.

4. Configure control interfaces:

4.1. Place BOOTSEL and RUN buttons and connect them appropriately (BOOTSEL routed to flash chip CS as per Pico behavior and RUN to gating/reset control).

4.2. Add the SWD header and connect SWDIO/SWCLK to the RP2040 debug pins.

5. Add connectivity headers:

5.1. Include 2x20 headers replicating the Pico pinout for easy access to RP2040 GPIOs and peripherals.

6. Final connectivity and reviews:

6.1. Connect all components according to the Pico board datasheet and Pico 2 W schematic, ensuring proper routing of high-speed signals and correct net assignments.

6.2. Perform ERC/DRC checks and update the BOM annotations.

#Success criteria

- The schematic includes all listed components with proper connections and power paths, replicating Pico’s core architecture.

- Decoupling, load capacitance, and protective components (PTC, USB ESD, CMC, common-mode choke) are correctly implemented and placed close to their respective components.

- The board pinout and net connectivity conform to the Pico datasheet and Pico 2 W design requirements.

Updated project description

Updated 3 document properties

Added 1x RP2040 as U1

Added 1x Ground as

Added 1x W25Q16JVSSIQ as U2

Connected U2:CS to U1:QSPI_CSN

Connected U2:CLK to U1:QSPI_SCLK

Connected U2:DI to U1:QSPI_SD0

Connected U2:DO to U1:QSPI_SD1

Connected U2:IO2 to U1:QSPI_SD2

Connected U2:IO3 to U1:QSPI_SD3

Connected U2:VCC to U1:VREG_VOUT

Connected U2:GND to GND:GND

Added 1x ABM8-272-T3 as Y1

Added 2x Generic Capacitor as C1, C2