Raspberry Pi's RP2354B packs 48 GPIOs and eight analog inputs into its 80-pin QFN package, but no official dev board uses it. Clintech is filling that gap with the Clintech Pico Board, an open-hardware design that fits the larger chip into the standard 51 x 21 mm (2.0 x 0.83 in) Pico footprint. Schematics, KiCad files, board definition headers, and demo firmware are all published, and the project is running on Crowd Supply at $20 (€18) per board.
The RP2354B shares its silicon with the RP2350A found on the Raspberry Pi Pico 2, pairing dual 150 MHz Arm Cortex-M33 cores with dual open-hardware Hazard3 RISC-V cores. Developers can boot any two-core combination, including one of each architecture. The chip provides 520 KB of SRAM, 2 MB of stacked in-package QSPI flash, and three PIO blocks containing 12 state machines. Where it diverges from the A-series package is I/O: 48 GPIOs and eight ADC-capable inputs versus 30 GPIOs and four on the standard Pico 2.
Clintech preserves pin compatibility along the board's two castellated edges, so existing Pico carrier boards and breadboard setups work without modification. The remaining 18 GPIOs and the QSPI signals for external memory land on 27 additional through-holes punched inside the board's outline. That external-memory interface supports up to 16 MB of QSPI flash or PSRAM, opening up headroom for display buffers, data acquisition, or larger MicroPython applications. The board is compatible with the standard Raspberry Pi Pico C/C++ SDK and MicroPython. The rp235x-hal crate from the rp-rs project extends that to Rust, with explicit RP2354B support and separate compilation targets for the chip's Arm and RISC-V cores, letting firmware authors target either architecture from the same toolchain. The board was featured in Adafruit's ICYMI Python on Microcontrollers Newsletter shortly after the campaign launched.
The Clintech Pico Board is available through Crowd Supply at $20 (€18), with USB-C for power and data, a three-pin SWD debug header, and a BOOTSEL button onboard.
