Fc980c controller

wlhlm·fc980c-controller·rev0/fc980c-controller.kicad_pcb

About the Fc980c controller PCB

Fc980c controller is an open source RP2040/RP2350 PCB design by wlhlm, published on GitHub. It is a 2-layer board measuring 82.3 × 35.5 mm, with 36 components from 23 distinct parts.

Its main chip is the STM32F401CBUX, from the RP2040/RP2350 family. Other key parts include the XC6206P332MR, USBLC6-2SC6, M24C64-RMN6TP and PCA9306DC. By type, the board carries 17 capacitors, 8 resistors, 5 ICs, 3 connectors, 1 crystal and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

Leopold FC980C replacement keyboard controller

Leopold FC980C Replacement Controller =====================================

This PCB replaces the controller of the Leopold FC980C keyboard to allow running alternate firmware, especially open source firmware such as [QMK][QMK]. This project relies heavily on the prior reverse engineering work done by hasu (aka tmk) and collaborators.

This is the first PCB I have designed and as such I suspect this will have many areas that can be improved. I am very much looking forward to hearing feedback about this design, if you think something can be improved please open an issue and let me know. I…

Fc980c controller, from the project README — From the project README

Main components on the Fc980c controller

XC6206P332MR STM32F401CBUX USBLC6-2SC6 M24C64-RMN6TP PCA9306DC

Fc980c controller bill of materials (BOM)

36 components, 23 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	XC6206P332MR	SOT-23	U1
1	STM32F401CBUX RP2040	RP2040-QFN-56	U2
1	USBLC6-2SC6	SOT-23-6	U3
1	M24C64-RMN6TP W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U4
1	PCA9306DC	VSSOP-8_2.3x2mm_P0.5mm	U5
1	C115962 12MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	SWD	PinHeader_1x05_P2.54mm_Horizontal	J1
1	C157923 USB	JST_PH_S5B-PH-SM4-TB_1x05-1MP_P2.00mm_Horizontal	J2
1	C506679 KEYBOARD	HRS_DF14_20P	J3
1	500MA 500mA	Fuse_1206_3216Metric	F1
1	BOOT0 BOOTSEL	SW_PUSH_6mm	SW1
3	1UF 1uF	C_0402_1005Metric	C1, C3, C4
1	4.7UF 1uF	C_0402_1005Metric	C2
7	100NF 100nF	C_0402_1005Metric	C5, C6, C11, C12, C13, C14, C15
1	10UF 10uF	C_0603_1608Metric	C7
1	1UF 100nF	C_0402_1005Metric	C8
2	20PF 27pF	C_0402_1005Metric	C9, C10
2	100nF	C_0402_1005Metric	C16, C17
2	10K 27R	R_0402_1005Metric	R1, R2
1	10K 1k	R_0402_1005Metric	R3

Show 3 more

Qty	Part	Footprint	Refs
2	1k	R_0402_1005Metric	R4, R5
1	200K 200k	R_0402_1005Metric	R6
2	10K 10k	R_0402_1005Metric	R7, R8

Fc980c controller design files

The KiCad project lives in the wlhlm/fc980c-controller repository on GitHub; these links point at the commit this page was built from.

Fc980c controller: common questions

What microcontroller does the Fc980c controller use?

The Fc980c controller is built around the STM32F401CBUX, from the RP2040/RP2350 family.

How big is the Fc980c controller PCB?

The Fc980c controller measures 82.3 × 35.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fc980c controller?

36 components, from 23 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Fc980c controller design files?

From the wlhlm/fc980c-controller repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Fc980c controller design in my own project?

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

Can I test firmware for the Fc980c controller 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.