2 layers31.9 × 36 mm
Lemon pcb
rianadon/Cosmos-Keyboard-PCBs
Open-Source keyboard PCB designs for the Cosmos Keyboard Generator
54 parts43
2 layers31.9 × 36 mm
Lemon pcb swizzle
rianadon/Cosmos-Keyboard-PCBs43Open-Source keyboard PCB designs for the Cosmos Keyboard Generator
- Size
- 31.9 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 76
- Pads
- 326
- Tracks, vias
- 1,699, 154
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 Dec 2024
- Updated
- 27 Apr 2026
Overview
Lemon pcb swizzle is an open-source printed circuit board by rianadon, from the rianadon/Cosmos-Keyboard-PCBs repository on GitHub. It is a 2-layer board of 31.9 × 36 mm with 63 parts on 76 nets, routed with 1,699 tracks and 154 vias.
It is built around the RP2040, ZD25WQ80CTIGT and FSUSB42MUX, with the LM66200DRL, XC6206P332MR-G and WS2812B-2020 among its other parts. Its parts include 18 capacitors, 16 resistors, 6 ICs, 4 transistors and 4 connectors. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
6
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
ZD25WQ80CTIGT
SOP-8NOR FLASHZetta
FSUSB42MUX
MSOP-10-40℃~+85℃ 12ns 13ns 2 250ps 2:1 3.7pF 3.9Ω 3V~4.4V 720MHz MSOP-10 Analog Switches, Multiplexers ROHSonsemiAnalog Switches, Multiplexers
LM66200DRL
SOT-583-40℃~+125℃ 1.32uA 1.6V~5.5V 2 74mΩ Reverse current blocking、Over temperature protection、With enable SOT-583 ORing Controllers ROHSTexas InstrumentsPower Distribution Switches
XC6206P332MR-G
UncategorisedUnknown maker
WS2812B-2020
SMD,2.2x2mm0.6mA 0.84mm 120us 160mcd 200mcd 2kHz 2mm 2mm 300ns 470.4nm 515.6nm 520mcd 5V 622.5nm 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function Top-mount SMD,2.2x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
README
lemon-wired-swizzle/README.mdLemon Wired Swizzle Microcontroller
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.
Theory of operation
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.
Shortly after the device is powered on, power is applied to both VBUS using a PMOS with an RC circuit at the gate to ensure there is a delay so that ST can settle before both VBUS are turned on. Because of the hysteresis on LM6620, turning on both VBUS does not change the ST pin.
License
Cosmos Keyboards invests time and resources providing this open source design, please support Cosmos and open-source hardware by purchasing products from Cosmos!
Designed by Ryan Adolf/rianadon for Cosmos Keyboards.
Creative Commons Attribution/Share-Alike, all text above must be included in any redistribution. See license.txt for additional details.
adapted from Adafruit's Creative Commons Attribution/Share-Alike license.
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C5, C6, C9, C10, C11, C12, C13, C14, C15 |
| 5 | 5k1 | Resistor_SMD:R_0402_1005Metric | R3, R4, R10, R11, R14 |
| 4 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R7, R16 |
| 4 | 27R | Resistor_SMD:R_0603_1608Metric | R5, R6, R8, R9 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R12, R13, R15 |
| 3 | 1uF | Capacitor_SMD:C_0402_1005Metric | C4, C8, C18 |
| 3 | Q_PMOS_SGD | Package_TO_SOT_SMD:SOT-23 | Q2, Q3, Q4 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C16, C17 |
| 2 | 22pF | Capacitor_SMD:C_0402_1005Metric | C2, C3 |
| 2 | FSUSB42MUX | Package_SO:MSOP-10_3x3mm_P0.5mm | U2, U5 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1, SW2 |
| 2 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1, J2 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | Conn_01x11 | Connector_PinHeader_2.54mm:PinHeader_1x11_P2.54mm_Vertical | J5 |
| 1 | Conn_01x11 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J3 |
| 1 | Fingers | Footprints:FPC-SMD_21P-P0.30_HDGC_0.3K-QX-21PWB | FPC1 |
| 1 | G*** | lemonlib:vik_small | svg2mod |
| 1 | LED_Small | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | LM66200 | Package_TO_SOT_SMD:SOT-583-8 | U6 |
| 1 | Q_NMOS | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | RP2040 | Sleep-Lib:RP2040-QFN-56 | U3 |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | Thumbs | Footprints:FPC-SMD_10P-P0.50_HC-FPC-05-09-10RLTAG | FPC2 |
| 1 | VIK Conn | Footprints:FPC-SMD_FPC05012-09200 | VIK1 |
| 1 | WS2812B-2020 | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1 |
| 1 | XC6206P332MR-G | Package_TO_SOT_SMD:SOT-23 | U4 |
| 1 | ZD25WQ80CTIGT | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | cosmoslogo | Footprints:cosmoslogo-kicad-small | G*** |
The 62 most common of 63 parts.
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Questions
How big is the Lemon pcb swizzle PCB?
It measures 31.9 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lemon pcb swizzle use?
63 parts, built around the RP2040, ZD25WQ80CTIGT, FSUSB42MUX and LM66200DRL. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Lemon pcb swizzle KiCad files?
From the rianadon/Cosmos-Keyboard-PCBs repository on GitHub, at the commit this page was made from: the board is lemon-wired-swizzle/lemon-pcb-swizzle.kicad_pcb and its schematic cactus-connector/cactus-connector.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lemon pcb swizzle design in my own project?
Its repository states no licence, so its author keeps all rights: ask rianadon before reusing the design.