Adafruit Metro RP2350 with PSRAM

Choo! Choo! This is the RP2350 Metro Line, making all station stops at "Dual Cortex M33 mountain", "528K RAM round-about" and "16 Megabytes of Flash town" with a bonus stop at "8 Megabytes of PSRAM village". This train is packed with hardware essentials for a comprehensive development board that supports projects needing Arduino shape compatibility or extra space and debugging sources.

Key features include an RP2350 main chip running at a 150MHz clock, 3.3V logic, 16MB of QSPI Flash for program storage, and 8MB of QSPI PSRAM for extra dynamic memory. It has 37 available GPIO: 23 on socket/SPI headers, 12 on the HSTX port, and another 2 for USB host. Six of these GPIOs are also analog inputs.

Enjoy the flexibility with a Micro SD card socket wired for SPI interfacing and advanced user SDIO interfacing. A 5V Buck Converter using TPS563201 delivers 6~17V DC input and up to 2A output. Features like an onboard RGB NeoPixel, #23 LED, a Stemma QT port for I2C peripherals and sensors amplify its versatility. The 22-pin 3-lane differential HSTX FPC port, with 'Pi 5' compatible pinout, ensures quick DVI video output, adding 12 extra GPIOs for more pins when needed.

Incorporate user-friendly reset and boot buttons on the PCB edge, and a Pico Probe debug port. Multiple power options include USB Type C power/data and a 5.5mm/2.1mm DC jack for 6-17VDC power, with an on/off switch for the DC jack. The RP2350 makes use of an RX/TX switch for easy D0 and D1 location swaps.

Its unique embedded 'permanent ROM' USB UF2 bootloader enables seamless programming via USB, appearing as a USB disk drive for firmware drag-and-drop. Familiar to Adafruit users, this feature eliminates double-click reset, using BOOTSEL held down during boot to enter instead.

Programming support extends to C/C++, unofficial Arduino support, an official MicroPython port, and a CircuitPython port, recommended for its ease and broad compatibility with Adafruit's drivers, displays, sensors, and more.

With expansive onboard RAM but external FLASH memory, this board is equipped with 16MB, shared between its running program and file storage for Python variants. When using C/C++, full flash memory is available, leaving about 14MB for additional code, files, images, and fonts in Python.

Technical specifications entail Dual ARM Cortex-M33 with a floating point unit or Dual RISC-V @ 150MHz, 520 kB on-chip SRAM, 8 kB one-time-programmable (OTP) memory, and support for off-chip Flash and external QSPI PSRAM. Additional features include a DMA controller, integrated power supply systems, hardware accelerators, and an extensive array of peripherals for enhanced operational potential.

Please note, the Adafruit Metro RP2350 features the A2 version of the RP2350, impacted by the E9 erratum, affecting GPIO and PIO uses like high-impedance inputs and internal pulldowns. Using 8.2K or smaller resistors may be necessary for certain applications. As of February 2025, only the A2 version is available.