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Routed second

EthanKahn08·example-pcb·work/routed-second.kicad_pcb

Routed second PCB layout, top view — open source RP2040/RP2350 board by EthanKahn08

About the Routed second PCB

Routed second is an open source RP2040/RP2350 PCB design by EthanKahn08, published on GitHub. It is a 4-layer board measuring 55 × 30 mm, with 60 components from 26 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q16JVSSIQ, TLV1117LV33DCYR, TPS22918DBVR and 74LVC125APW. By type, the board carries 23 capacitors, 21 resistors, 6 diodes, 5 ICs, 2 connectors and 2 switches.

From the project

Design-stage RP2040 USB-C microSD reader: KiCad hardware, verification evidence, UART bring-up firmware, and assembly plan. Unbuilt and untested.

A custom RP2040 board intended to expose a removable microSD card as a USB drive. It uses 2 MiB external firmware flash, a 12 MHz crystal, USB-C, and a switched SPI card interface.

Status: design stage. No board has been assembled or bench tested. Hardware file checks pass. UART bring-up firmware is included; SD and USB Mass Storage firmware still need implementation.

Routed second, from the project README
From the project README

Main components on the Routed second

RP2040W25Q16JVSSIQTLV1117LV33DCYRTPS22918DBVR74LVC125APW

Routed second bill of materials (BOM)

60 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RP2040
Raspberry Pi
U1
1
W25Q16JVSSIQ
Winbond
U2
1
TLV1117LV33DCYR
Texas Instruments
U3
1
TPS22918DBVR
Texas Instruments
U4
1
74LVC125APW
Nexperia
U7
1
ABM8-272-T3
12MHz CL10pF
Abracon
Y1
1
USB4105-GF-A
USB-C USB2
GCT
J1
1
DM3AT-SF-PEJM5
microSD / detect
Hirose
J2
1
Y97LT25B2DBFP
BOOT
Littelfuse / C&K
SW1
1
Y97LT25B2DBFP
RESET
Littelfuse / C&K
SW2
1
USBLC6-2SC6
STMicroelectronics
D1
4
PESD5V0U2BT
Nexperia
D2, D4, D5, D6
1
LTST-C190KGKT
GREEN
Lite-On
D7
2
GRM1885C1H150JA01D
15pF
Murata
C1, C2
14
GRM188R71H104KA93D
100nF
Murata
C3, C4, C5, C6, C7, C8, C9, C10 +6
4
GRM188R71E105KA12D
1uF
Murata
C11, C12, C16, C22
1
GRM188R61A475KE15D
4.7uF
Murata
C17
1
C0603C472K5RACTU
4.7nF
KEMET
C19
1
GRM32ER61A476KE20L
47uF
Murata
C20
3
CRCW060310K0FKEA
10k
Vishay
R1, R18, R19
Show 6 more
QtyPartRefs
4
CRCW06031K00FKEA
1k
Vishay
R2, R8, R20, R21
2
CRCW06035K10FKEA
5.1k
Vishay
R3, R4
2
CRCW060327R0FKEA
27
Vishay
R5, R6
2
CRCW0603100KFKEA
100k
Vishay
R7, R17
3
CRCW060333R0FKEA
33
Vishay
R9, R10, R11
5
CRCW060347K0FKEA
47k
Vishay
R12, R13, R14, R15, R16

Routed second design files

The KiCad project lives in the EthanKahn08/example-pcb repository on GitHub; these links point at the commit this page was built from.

Routed second: common questions

What microcontroller does the Routed second use?

The Routed second is built around the RP2040, from the RP2040/RP2350 family.

How big is the Routed second PCB?

The Routed second measures 55 × 30 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Routed second?

60 components, from 26 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 Routed second design files?

From the EthanKahn08/example-pcb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Routed second design in my own project?

The repository has no license, so all rights stay with EthanKahn08. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Routed second 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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