2 layers54.6 × 49.5 mm
Multicdc
ondras12345/multicdc
RP2040-based 6-channel USB to UART converter with Zephyr RTOS
35 parts1MIT
2 layers116 × 30 mm
Multicdc LEDs
ondras12345/multicdc1RP2040-based 6-channel USB to UART converter with Zephyr RTOS
- Size
- 116 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 24
- Pads
- 86
- Tracks, vias
- 97, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Mar 2025
- Updated
- 17 Mar 2026
Overview
Multicdc LEDs 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 116 × 30 mm with 37 parts on 24 nets, routed with 97 tracks and 0 vias.
It is built around the AO3400A, 0ZCF0150FF2C and 0ZCJ0025AF2E, with the P6SMBJ24A among its other parts. Its parts include 12 resistors, 11 connectors, 5 transistors, 2 capacitors and 2 fuses.
Main components
4
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
0ZCF0150FF2C
2920-40℃~+85℃ 1.5A 1.5W 100A 230mΩ 2s 33V 3A 50mΩ 2920 Resettable Fuses ROHSBel FuseResettable Fuses
0ZCJ0025AF2E
1206-40℃~+85℃ 2.3Ω 24V 250mA 40A 500mA 550mΩ 600mW 8s 1206 Resettable Fuses ROHSBel FuseResettable Fuses
P6SMBJ24A
DO-214AA(SMB)-50℃~+150℃ 15.4A 1uA 24V 26.7V 38.9V 600W TVS Unidirectional DO-214AA(SMB) ESD and Surge Protection (TVS/ESD) ROHSDIOTECESD And Surge Protection (TVS/ESD)
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
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | Conn_01x01 | Connector_Wire:SolderWire-0.25sqmm_1x01_D0.65mm_OD1.7mm_Relief | J2, J3, J4, J5, J6, J7, J8, J9 |
| 5 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5 |
| 5 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R7, R8, R9, R10 |
| 5 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 1 | 0ZCF0150FF2C | Fuse:Fuse_2920_7451Metric_Pad2.10x5.45mm_HandSolder | F1 |
| 1 | 0ZCJ0025AF2E | Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F2 |
| 1 | 100n / 50V | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 4k7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12 |
| 1 | EGF477M1VG16RRTHP-R | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C2 |
| 1 | P6SMBJ24A | Diode_SMD:D_SMB_Handsoldering | D1 |
| 1 | Screw_Terminal_01x06 | ondra:TerminalBlock_Xinya_XY301VA-5.00-6P_1x06_P5.00mm_Horizontal | J10 |
| 1 | TBG-5-KB-3P/GN | ondra:TBG-5-KB-3P_1x03_P5.08mm_Horizontal | J1 |
| 1 | soldered wires | Connector_Wire:SolderWire-0.25sqmm_1x04_P4.2mm_D0.65mm_OD1.7mm_Relief | J11 |
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Questions
How big is the Multicdc LEDs PCB?
It measures 116 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Multicdc LEDs use?
37 parts, built around the AO3400A, 0ZCF0150FF2C, 0ZCJ0025AF2E and P6SMBJ24A. 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 LEDs KiCad files?
From the ondras12345/multicdc repository on GitHub, at the commit this page was made from: the board is hardware/multicdc-LEDs/multicdc-LEDs.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 LEDs 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).