Fercus dongle
About the Fercus dongle PCB
Fercus dongle is an open source RISC-V PCB design by Dachtire, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 12.9 × 26 mm, with 26 components from 16 distinct parts.
Its main chip is the CH32V208GBU6, from the RISC-V family. Other key parts include the XC6206P332MR. By type, the board carries 10 capacitors, 6 resistors, 2 ICs, 2 crystals, 2 switches and 1 connector.
It belongs with the keyboards and iot & wireless designs in this gallery.
From the project
Wireless low profile optical switch split keyboard
Main components on the Fercus dongle
Fercus dongle bill of materials (BOM)
26 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH32V208GBU6 | QFN-28-1EP_4x4mm_P0.4mm_EP2.6x2.6mm_ThermalVias_Drill0.3mm | U1 |
| 1 | XC6206P332MR | SOT-23 | U2 |
| 1 | 32MHz | Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | 32.768kHz | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y2 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | Antenna_Shield | WCH_MIFA-1_2.4GHz_1.6mm_FR4_Left_Mask | AE1 |
| 2 | SW_Push | SW_SPST_CK_KXT3 | SW1, SW2 |
| 1 | LED_RGAB | KTR-B1615RGBC+ | D1 |
| 1 | 1.8nH | L_0402_1005Metric | L1 |
| 3 | 100nF | C_0402_1005Metric | C1, C2, C3 |
| 3 | 1uF | C_0402_1005Metric | C4, C9, C10 |
| 2 | 12pF | C_0402_1005Metric | C5, C6 |
| 2 | 1.8pF | C_0402_1005Metric | C7, C8 |
| 1 | 10kR | R_0402_1005Metric | R1 |
| 2 | 5.1kR | R_0402_1005Metric | R2, R3 |
| 3 | 1kR | R_0402_1005Metric | R4, R5, R6 |
Fercus dongle design files
The KiCad project lives in the Dachtire/fercus repository on GitHub; these links point at the commit this page was built from.
Fercus dongle: common questions
What microcontroller does the Fercus dongle use?
The Fercus dongle is built around the CH32V208GBU6, from the RISC-V family.
How big is the Fercus dongle PCB?
The Fercus dongle measures 12.9 × 26 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Fercus dongle?
26 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the Fercus dongle design files?
From the Dachtire/fercus repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Fercus dongle design in my own project?
Yes, under the terms of its GPL-3.0 license, which Dachtire chose for the repository.
Can I test firmware for the Fercus dongle without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.
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