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Keyword top

notaroomba·keybytes·hardware/keyword/keyword_top.kicad_pcb

Keyword top PCB layout, top view — open source STM32 board by notaroomba
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About the Keyword top PCB

Keyword top is an open source STM32 PCB design by notaroomba, published on GitHub. It is a 4-layer board measuring 19.1 × 19.1 mm, with 35 components from 16 distinct parts.

Its main chip is the STM32WB55RGVX, from the STM32 family. Other key parts include the NX2012SA-32.768KHZ-STD-MUB-2, W25Q16JVUXIQ, MLPF-WB-04D3 and XL-1608RGBC. By type, the board carries 18 capacitors, 5 ICs, 5 resistors, 3 connectors, 2 inductors and 1 crystal.

It belongs with the keyboards, iot & wireless and power & battery designs in this gallery.

From the project

A truly modular keyboard

- Truly modular - every key is its own self-contained board. Pop them off, rearrange the layout, and snap them back wherever you want. - Magnetic keycaps - caps hold on with embedded 2×0.5mm magnets and latch onto the switch's side rails. No tools, no soldering. - Pogo-pin interconnect - keys link to the main board (and each other) through spring-loaded pogo pins and pads, so there's nothing to plug in. - Smart per-key MCU - each module runs a cheap CH32V003 RISC-V microcontroller and reports over a shared I²C bus. - Bluetooth + USB main board - the central board is built around an…

Keyword top, from the project README
From the project README

Main components on the Keyword top

NX2012SA-32.768KHZ-STD-MUB-2W25Q16JVUXIQSTM32WB55RGVXMLPF-WB-04D3XL-1608RGBC

Keyword top bill of materials (BOM)

35 components, 16 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NX2012SA-32.768KHZ-STD-MUB-2
U3
1
W25Q16JVUXIQ
U10
1
STM32WB55RGVX
STM32WB55RGVx
U11
1
MLPF-WB-04D3
U12
1
XL-1608RGBC
U14
1
NX2016SA-32MHZ-STD-CZS-5
X1
3
YZ00615050R-08
CN7, CN8, CN9
1
2450AT18A100E
AE1
1
10UH
10uH
L1
1
10NH
10nH
L2
4
10PF
10pF
C1, C2, C6, C9
9
100NF
100nF
C3, C25, C26, C27, C29, C30, C32, C34 +1
3
4.7UF
4.7uF
C24, C28, C31
2
1UF
1uF
C33, C36
2
4.7K
R8, R11
3
100R
R12, R13, R14

Keyword top design files

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

Keyword top: common questions

What microcontroller does the Keyword top use?

The Keyword top is built around the STM32WB55RGVX, from the STM32 family.

How big is the Keyword top PCB?

The Keyword top measures 19.1 × 19.1 mm, has 4 copper layers and is 1.5842 mm thick.

How many components are on the Keyword top?

35 components, from 16 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 Keyword top design files?

From the notaroomba/keybytes repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Keyword top design in my own project?

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

Can I test firmware for the Keyword top 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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