Spica

About the Spica PCB

Spica is an open source RP2040/RP2350 PCB design by illness072, published on GitHub under the Custom license license. It is a 2-layer board measuring 3.4 × 3 mm, with 72 components from 21 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the TLV75733PDBV and W25Q128JVS. By type, the board carries 20 inductors, 19 switches, 15 capacitors, 7 resistors, 4 connectors and 3 ICs.

From the project

Spica is a 38-keys keyboard inspired by the Gemini Keyboard layout by zk-phi(@zk-phi). It was named by Sumiso(@kutsuhimo3).

Gemini Keyboard by @zk-phi https://github.com/zk-phi/gemini-keyboard

Case Data https://github.com/illness072/Spica-case/

Main components on the Spica

TLV75733PDBV RP2040 W25Q128JVS

Spica bill of materials (BOM)

72 components, 21 distinct parts.

Qty	Part	Footprint	Refs
1	TLV75733PDBV	SOT-23-5	U1
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U2
1	W25Q128JVS	WSON-8-1EP_6x5mm_P1.27mm_EP3.4x4.3mm	U3
1	12MHz	Resonator_SMD_Murata_CSTxExxV-3Pin_3.0x1.1mm	Y1
1	USB_C_Receptacle	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1
2	Conn_01x04_Female	PinSocket_1x04_P2.54mm_Vertical	J2, J3
1	AudioJack4	MJ-4PP-9_cross	J4
1	SW_BOOT	SW_Push_1P1T_NO_Vertical_Wuerth_434133025816	BSW1
1	SW_RESET	SW_Push_1P1T_NO_Vertical_Wuerth_434133025816	RSW1
17	SW_Push	MX_1.00u-reversible	SW1, SW2, SW3, SW4, SW5, SW7, SW8, SW9 +9
1	SW_Push	MX_1.25u-reversible	SW6
1	SW_Push	MX_1.50u-reversible	SW11
1	1N4148W	D_SOD-123	D1
20	SK6812MINI-E	SK6812MINI-E_Rev	L1, L2, L3, L4, L5, L6, L7, L8 +12
2	1u	C_0402_1005Metric	C1, C2
3	2.2u	C_0402_1005Metric	C3, C6, C15
10	100n	C_0402_1005Metric	C4, C5, C7, C8, C9, C10, C11, C12 +2
2	1k	R_0402_1005Metric	R1, R3
1	10k	R_0402_1005Metric	R2
2	27	R_0402_1005Metric	R4, R5

Show 1 more

Qty	Part	Footprint	Refs
2	5.1k	R_0402_1005Metric	R6, R7

Spica design files

The KiCad project lives in the illness072/Spica-PCB repository on GitHub; these links point at the commit this page was built from.

Layoutspica.kicad_pcb
Schematicspica.kicad_sch

Spica: common questions

What microcontroller does the Spica use?

The Spica is built around the RP2040, from the RP2040/RP2350 family.

How big is the Spica PCB?

The Spica measures 3.4 × 3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Spica?

72 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Spica design files?

From the illness072/Spica-PCB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Spica design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Spica 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.