2 layers116 × 30 mm
Multicdc LEDs
ondras12345/multicdc
RP2040-based 6-channel USB to UART converter with Zephyr RTOS
37 parts1MIT
2 layers54.6 × 49.5 mm
Multicdc
ondras12345/multicdc1RP2040-based 6-channel USB to UART converter with Zephyr RTOS
- Size
- 54.6 × 49.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 47
- Pads
- 177
- Tracks, vias
- 251, 10
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Mar 2025
- Updated
- 17 Mar 2026
Overview
Multicdc is an open-source printed circuit board by ondras12345, from the ondras12345/multicdc repository on GitHub, published under the MIT licence. It is a 2-layer board of 54.6 × 49.5 mm with 35 parts on 47 nets, routed with 251 tracks and 10 vias.
It is built around the Π122M30, RP2040-ZERO and ESD5Z3.3T1G, with the P4SMAJ5.0A among its other parts. Its parts include 12 capacitors, 10 connectors, 7 ICs and 2 diodes. It belongs with the RP2040 boards of this library.
Main components
4
Π122M30
SOP-8-40℃~+125℃ 1 1 10Mbps 3000 3V~5.5V 3V~5.5V 75kV/us 9ns Fail-safe output、Multi-voltage domain interface Low Level SOP-8 Digital Isolators ROHS2Pai SemiDigital Isolators
RP2040-ZERO
-- Development Boards & Kits ROHSWaveshareDevelopment Boards & Kits
ESD5Z3.3T1G
SOD-523-55℃~+125℃ 1 110pF 11A 14V 150W 200nA 3.3V 5V ESD IEC 61000-4-2、IEC 61000-4-4 Unidirectional SOD-523 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
P4SMAJ5.0A
SMA(DO-214AC)ESD And Surge Protection (TVS/ESD)DIOTEC
README
README.mdMultiCDC
This is a simple RP2040-based 6-channel USB to UART converter.
This is my first project using the Zephyr RTOS, so there might be lots of mistakes. However, it seems to work.
Operation
The device creates 7 /dev/ttyACM* devices when connected to a linux host.
The first 6 are linked to hardware UARTs, and /dev/ttyACM6 is used for
logging and shell.
The RP2040 only has 2 hardware UARTs. The other 4 channels use the PIOs.
Unfortunately, the pico-uart-pio driver doesn't allow changing the baud
rate at runtime. For this reason, baud rates (current-speed) for those
channels need to be set in the device tree (app.overlay).
Pin map (most of these can be changed arbitrarily):
| pin | function |
|---|---|
| P0 | Tx0 |
| P1 | Rx0 |
| P2 | Tx1 |
| P3 | Rx1 |
| P4 | Tx2 |
| P5 | Rx2 |
| P6 | Tx3 |
| P7 | Rx3 |
| P8 | Tx4 |
| P9 | Rx4 |
| P10 | Tx5 |
| P11 | Rx5 |
Build
. ~/zephyrproject/.venv/bin/activate
. ~/zephyrproject/zephyr/zephyr-env.sh
west build
# enter bootloader: press BOOT button, press & release RESET, release BOOT
west flashUdev rules
sudo tee /etc/udev/rules.d/99-multicdc.rules > /dev/null << "EOF"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="00", SYMLINK+="tty-mcdc0ch0"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="02", SYMLINK+="tty-mcdc0ch1"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="04", SYMLINK+="tty-mcdc0ch2"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="06", SYMLINK+="tty-mcdc0ch3"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="08", SYMLINK+="tty-mcdc0ch4"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="0a", SYMLINK+="tty-mcdc0ch5"
SUBSYSTEM=="tty", ENV{ID_VENDOR_ID}=="2fe3", ENV{ID_MODEL_ID}=="6cdc", ENV{ID_USB_INTERFACE_NUM}=="0c", SYMLINK+="tty-mcdc0shell"
EOF
sudo udevadm control --reload-rules
sudo udevadm triggerParts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12 |
| 6 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J1, J2, J3, J4, J5, J6 |
| 6 | Π122M30 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3, U4, U5, U6 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J7, J8, J9 |
| 1 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J10 |
| 1 | ESD5Z3.3T1G | Diode_SMD:D_SOD-523 | D2 |
| 1 | P4SMAJ5.0A | Diode_SMD:D_SMA_Handsoldering | D1 |
| 1 | RP2040-Zero | ondra:RP2040-Zero | U7 |
Questions
How big is the Multicdc PCB?
It measures 54.6 × 49.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Multicdc use?
35 parts, built around the Π122M30, RP2040-ZERO, ESD5Z3.3T1G and P4SMAJ5.0A. 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 Multicdc KiCad files?
From the ondras12345/multicdc repository on GitHub, at the commit this page was made from: the board is hardware/multicdc/multicdc.kicad_pcb and its schematic hardware/multicdc-LEDs/multicdc-LEDs.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Multicdc design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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