HardLabs

Rp2350-decoder

mikesmitty·rp24-dcc-decoder·hardware/rp2350-decoder/rp2350-decoder.kicad_pcb

Rp2350-decoder PCB layout, top view — open source RP2040/RP2350 board by mikesmitty

About the Rp2350-decoder PCB

Rp2350-decoder is an open source RP2040/RP2350 PCB design by mikesmitty, published on GitHub under the CERN-OHL-P-2.0 license. It is a 6-layer board measuring 19.9 × 8.8 mm, with 67 components from 32 distinct parts.

Its main chip is the AP1606, from the RP2040/RP2350 family. Other key parts include the NCS2220AMUT1G, AP63203WU, W25Q128JVPIQ, RP2350A and MAX98357AEWL+T. By type, the board carries 19 resistors, 18 capacitors, 9 diodes, 8 transistors, 6 ICs and 3 connectors.

It belongs with the audio designs in this gallery.

From the project

DIY DCC decoder for model railroad locomotives in an E24 form factor, powered by an RP2350 (Raspberry Pi Pico 2)

Inspired by the rp2040-decoder project by gab-k: https://github.com/gab-k/RP2040-Decoder

Rp2350-decoder, from the project README
From the project README

Main components on the Rp2350-decoder

NCS2220AMUT1GAP63203WUW25Q128JVPIQRP2350AMAX98357AEWL+TMD9927

Rp2350-decoder bill of materials (BOM)

67 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NCS2220AMUT1G
U1
1
AP63203WU
U2
1
W25Q128JVPIQ
U3
1
RP2350A
U4
1
MAX98357AEWL+T
U5
1
MD9927
DRV8220DRL
U6
2
AP1606
Q1, Q2
2
NST847BPDP6T5G
Q3, Q4
4
DMN2991UDA-7B
Q5, Q6, Q7, Q8
1
ABM8-272-T3
Y1
1
SWDIO
J1
1
SWCLK
J2
1
5052702412
J3
1
C913778
BOOT
SW1
4
LMBR4020H3T5G
D1, D2, D3, D4
2
RB161QS-40
D5, D6
2
BZX884C3V3
D7, D8
1
C130724
Blue LED
D9
1
4.7UH
4.7uH
L1
1
3.3UH
3.3uH
L2
Show 12 more
QtyPartRefs
6
100NF
100nF
C1, C4, C7, C12, C13, C14
2
2.2UF
2.2uF
C2, C3
1
22UF
22uF
C5
1
100UF
47uF
C6
2
10PF
10pF
C8, C11
5
4.7UF
4.7uF
C9, C10, C15, C17, C18
1
47UF
47uF
C16
8
6.8K
R1, R6, R7, R8, R12, R13, R16, R18
6
1K
R2, R4, R5, R15, R17, R19
1
2.2K
R3
3
22R
R9, R10, R11
1
33R
R14

Rp2350-decoder design files

The KiCad project lives in the mikesmitty/rp24-dcc-decoder repository on GitHub; these links point at the commit this page was built from.

Rp2350-decoder: common questions

What microcontroller does the Rp2350-decoder use?

The Rp2350-decoder is built around the AP1606, from the RP2040/RP2350 family.

How big is the Rp2350-decoder PCB?

The Rp2350-decoder measures 19.9 × 8.8 mm, has 6 copper layers and is 0.8464 mm thick.

How many components are on the Rp2350-decoder?

67 components, from 32 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 Rp2350-decoder design files?

From the mikesmitty/rp24-dcc-decoder 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 Rp2350-decoder design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which mikesmitty chose for the repository.

Can I test firmware for the Rp2350-decoder 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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