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Lemon pcb swizzle

rianadon·Cosmos-Keyboard-PCBs·lemon-wired-swizzle/lemon-pcb-swizzle.kicad_pcb

Lemon pcb swizzle layout, top view — open source RP2040/RP2350 board by rianadon
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About the Lemon pcb swizzle

Lemon pcb swizzle is an open source RP2040/RP2350 PCB design by rianadon, published on GitHub. It is a 2-layer board measuring 31.9 × 36 mm, with 56 components from 26 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the ZD25WQ80CTIGT, FSUSB42MUX, XC6206P332MR-G and LM66200. By type, the board carries 18 capacitors, 16 resistors, 6 ICs, 4 transistors, 4 connectors and 2 switches.

It belongs with the keyboards designs in this gallery.

From the project

Open-Source keyboard PCB designs for the Cosmos Keyboard Generator

This is a version of the Lemon Wired that swap the two USB ports depending on which one has power incoming.

The pinout is equivalent to v0.4 of the Lemon Wired. However, while GP16 was previously now unused, it's now the software override for the USB swap.

I use LM6620 to isolate the the VBUS voltages on both USB sockets. This part has an ST pin that indicates which VBUS was powered. This ST pin drives sel, and if sel is not overwrittten by GP16, then the two USB data lines are swapped using FSUSB42MUX.

Main components on the Lemon pcb swizzle

ZD25WQ80CTIGTFSUSB42MUXRP2040XC6206P332MR-GLM66200

Lemon pcb swizzle bill of materials (BOM)

56 components, 26 distinct parts.

QtyPartRefs
1
ZD25WQ80CTIGT
U1
2
FSUSB42MUX
U2, U5
1
RP2040
U3
1
XC6206P332MR-G
U4
1
LM66200
U6
1
Q_NMOS
Q1
3
Q_PMOS_SGD
Q2, Q3, Q4
1
12MHz
Y1
2
USB_C_Receptacle_USB2.0
J1, J2
1
Conn_01x11
J3
1
Conn_01x11
J5
1
Fingers
FPC1
1
Thumbs
FPC2
2
SW_Push
SW1, SW2
1
VIK Conn
VIK1
1
WS2812B-2020
D1
1
LED_Small
D2
10
100nF
C1, C5, C6, C9, C10, C11, C12, C13 +2
2
22pF
C2, C3
3
1uF
C4, C8, C18
Show 6 more
QtyPartRefs
1
10uF
C7
2
1uF
C16, C17
4
1k
R1, R2, R7, R16
5
5k1
R3, R4, R10, R11, R14
4
27R
R5, R6, R8, R9
3
10k
R12, R13, R15

Lemon pcb swizzle design files

The KiCad project lives in the rianadon/Cosmos-Keyboard-PCBs repository on GitHub; these links point at the commit this page was built from.

Lemon pcb swizzle: common questions

What microcontroller does the Lemon pcb swizzle use?

The Lemon pcb swizzle is built around the RP2040, from the RP2040/RP2350 family.

How big is the Lemon pcb swizzle?

The Lemon pcb swizzle measures 31.9 × 36 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lemon pcb swizzle?

56 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lemon pcb swizzle design files?

From the rianadon/Cosmos-Keyboard-PCBs repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Lemon pcb swizzle design in my own project?

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

Can I test firmware for the Lemon pcb swizzle 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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