HardLabs

Fire-28-a2

johanputzolu-cmd·Onerom·hardware/pcb/verified/fire-28-a2/kicad/fire-28-a2.kicad_pcb

Fire-28-a2 PCB layout, top view — open source RP2040/RP2350 board by johanputzolu-cmd

About the Fire-28-a2 PCB

Fire-28-a2 is an open source RP2040/RP2350 PCB design by johanputzolu-cmd, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 18.9 × 36.7 mm, with 42 components from 20 distinct parts.

Its main chip is the RP2354B, from the RP2040/RP2350 family. Other key parts include the 28 Pin ROM, AP2112K-3.3, USBLC6-2P6 and W25Q16JVSS. By type, the board carries 19 capacitors, 10 resistors, 5 ICs, 3 connectors, 3 diodes and 1 crystal.

From the project

A2 revision of the 28 pin Fire ROM board. Combined USB/Pro version with USB-C and SWD header pins.

A2 revision of the 28 pin Fire ROM board. Combined USB/Pro version with USB-C and SWD header pins.

Minor differences from revision A: - Programming pins have been slightly rearranged.

- Schematic - Fab Files - KiCad Design Files - Errata - Notes - Changelog - BOM

The silkscreen on this revision mislabels the SWD CLK and DIO pins. The CLK is DIO and DIO is CLK.

Main components on the Fire-28-a2

RP2354B28 Pin ROMAP2112K-3.3USBLC6-2P6W25Q16JVSS

Fire-28-a2 bill of materials (BOM)

42 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RP2354B
RP2350_60QFN
U1
1
28 Pin ROM
U2
1
AP2112K-3.3
U3
1
USBLC6-2P6
U4
1
W25Q16JVSS
U5
1
CRYSTAL_GND24
Crystal_GND24
Y1
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J1
1
Conn_02x04_Odd_Even
J2
1
Conn_01x02_Pin
J3
1
C2286
LED_Small
D1
2
1N5819WS
D2, D3
1
3.3U
3.3u
L1
6
4.7UF
4.7uF
C1, C2, C3, C7, C13, C15
9
0.1UF
0.1uF
C4, C5, C6, C8, C9, C10, C11, C12 +1
2
4.7UF
4.7uF
C16, C17
2
15PF
15pF
C18, C19
4
10K
R1, R3, R7, R8
3
1K
R2, R5, R6
1
33R
R4
2
5K1
R9, R10

Fire-28-a2 design files

The KiCad project lives in the johanputzolu-cmd/Onerom repository on GitHub; these links point at the commit this page was built from.

Fire-28-a2: common questions

What microcontroller does the Fire-28-a2 use?

The Fire-28-a2 is built around the RP2354B, from the RP2040/RP2350 family.

How big is the Fire-28-a2 PCB?

The Fire-28-a2 measures 18.9 × 36.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fire-28-a2?

42 components, from 20 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Fire-28-a2 design files?

From the johanputzolu-cmd/Onerom repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Fire-28-a2 design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which johanputzolu-cmd chose for the repository.

Can I test firmware for the Fire-28-a2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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