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Matrix + Multiplex

livid05·ProofOfConcept·schematics/matrix_multiplex/Matrix + Multiplex.kicad_pcb

Matrix + Multiplex PCB layout, top view — open source STM32 board by livid05

About the Matrix + Multiplex PCB

Matrix + Multiplex is an open source STM32 PCB design by livid05, published on GitHub. It is a 2-layer board measuring 3.6 × 3.3 mm, with 73 components from 11 distinct parts.

Its main chip is the STM32U595RITX, from the STM32 family. Other key parts include the AMS1117-3.3, USBLC6-2SC6, W25Q128JVS, SN74LV1T125DBV and TMR2615F. By type, the board carries 19 LEDs, 16 ICs, 2 connectors and 1 resistor.

It belongs with the keyboards, iot & wireless and dev boards & breakouts designs in this gallery.

From the project

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A custom 4×4 keypad with rotary encoder and per-key RGB, built on an RP2040, that transmits keystrokes wirelessly to a PC via either BLE (Bluetooth Low Energy) or a 2.4 GHz proprietary radio link using a Nordic nRF52840 bridge board.

Hardware path: RP2040 keypad → UART (GP0) → TENSTAR nRF52840 → BLE or 2.4 GHz → PC

1. Project Overview 2. Hardware 3. Repository Structure 4. System Architecture 5. Wireless Protocol 6. QMK Firmware (RP2040) 7. BLE Bridge (blebridge) 8. 2.4 GHz ESB Bridge + Dongle (esbbridge / esb_dongle) 9. Keymap & Layers 10. RGB Matrix 11. Rotary Encoder 12. HC4067 Analog…

Main components on the Matrix + Multiplex

STM32U595RITXAMS1117-3.3USBLC6-2SC6W25Q128JVSSN74LV1T125DBVTMR2615F

Matrix + Multiplex bill of materials (BOM)

73 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32U595RITX
TMR2615F
U1
1
AMS1117-3.3
TMR2615F
U2
1
USBLC6-2SC6
TMR2615F
U3
1
W25Q128JVS
TMR2615F
U4
1
SN74LV1T125DBV
U5
11
TMR2615F
U6, U7, U8, U9, U10, U11, U12, U13 +3
1
USB_C_RECEPTACLE_USB2.0_16P
Conn_01x15_Pin
J1
1
CONN_01X26_PIN
Conn_01x04_Pin
J2
35
0.1uF
LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8 +27
19
SK6812MINI-E
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +11
1
330
R11

Matrix + Multiplex design files

The KiCad project lives in the livid05/ProofOfConcept repository on GitHub; these links point at the commit this page was built from.

Matrix + Multiplex: common questions

What microcontroller does the Matrix + Multiplex use?

The Matrix + Multiplex is built around the STM32U595RITX, from the STM32 family.

How big is the Matrix + Multiplex PCB?

The Matrix + Multiplex measures 3.6 × 3.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Matrix + Multiplex?

73 components, from 11 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 Matrix + Multiplex design files?

From the livid05/ProofOfConcept 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 Matrix + Multiplex design in my own project?

The repository has no license, so all rights stay with livid05. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Matrix + Multiplex without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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