RP2350-ETH Mini Ethernet Development Board

A tiny board with built-in wired networking

The RP2350-ETH Mini Ethernet Development Board features a Raspberry Pi RP2350 microcontroller, onboard Ethernet, 14 GPIO pins and a dual-core architecture. The RP2350 chip combines a dual-core ARM Cortex-M33 with a Hazard3 RISC-V core, so you can develop in either architecture, running at up to 150 MHz with 520 KB of SRAM and 4 MB of onboard flash.

Wired connectivity comes from an onboard CH9120 chip with an integrated TCP/IP protocol stack, which gives the board Ethernet networking without needing a separate module or shield.

Specifications

The 14 GPIO pins support SPI, I2C, UART and PWM, and there is a 12-bit ADC with 3 channels, 13 controllable PWM channels and 12 programmable I/O (PIO) state machines. The board has a compact PCB with half-hole castellated edges for easy mounting, a built-in temperature sensor, and it is programmed by drag-and-drop USB mass storage upload, so no special flashing tools are needed.

Flash a simple blink or UART example first to confirm the board, toolchain and debugger all talk to each other, before moving on to your own peripherals. Keep the SWD or USB connection short and shielded if you see intermittent flashing failures.

Who it is for

Makers and product developers who want a small, wired-networking microcontroller board without adding a separate Ethernet module.

Networking basics

Because the Ethernet comes from the onboard CH9120 chip rather than the RP2350 itself, most of your networking code talks to that chip over a simple serial-like interface rather than a full TCP/IP stack running on the microcontroller, which keeps your own code simpler at the cost of some flexibility.

Questions buyers ask

Which chip does it use?

The Raspberry Pi RP2350, with dual ARM Cortex-M33 and Hazard3 RISC-V cores.

Does it have Ethernet?

Yes, through an onboard CH9120 chip with its own TCP/IP stack.

How much memory does it have?

520 KB of SRAM and 4 MB of flash.