4 layers172.5 × 85 mm Devhub, the printed circuit board in 3D

Devhub

Switchable USB Hub

Size: 172.5 × 85 mm
Copper layers: 4
Thickness: 1.62 mm
Parts: 216
Nets: 230
Pads: 937
Tracks, vias: 985, 243
Pours: 32
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 10 Oct 2026
Updated: 28 Oct 2026

Overview

Devhub is an open-source printed circuit board by mpolci, from the mpolci/devhub repository on GitHub, published under the MIT licence. It is a 4-layer board of 172.5 × 85 mm with 216 parts on 230 nets, routed with 985 tracks and 243 vias.

It is built around the STM32G0B1RET6, USB2517I-JZX and PI3USB4002A, with the TPS2561ADRCR, AP7361C-33E and ULN2003V12D among its other parts. Its parts include 77 resistors, 69 capacitors, 18 diodes, 16 ICs and 14 connectors. It belongs with the STM32 boards of this library.

Main components

README

README.md

devhub — hub USB "intelligente" per lo sviluppo hardware

Hub USB da banco pensato per chi sviluppa dispositivi a microcontrollore collegati via USB. Oltre alle porte downstream espone all'host un dispositivo di controllo (USB HID) con cui il PC può:

staccare e riattaccare fisicamente ogni porta (alimentazione VBUS e linee dati D+/D-), per resettare un dispositivo bloccato anche quando il reset via USB non funziona;
leggere lo stato di ogni porta (abilitata/disabilitata, sovracorrente, corrente assorbita);
comandare due relè indipendenti con uscite su boccole a banana (es. per sezionare l'alimentazione esterna del dispositivo in prova o chiudere un contatto di reset).

Caratteristiche previste (v1)

Voce	Scelta v1
Porte downstream	4 × USB-C + 1 × USB-A
Velocità	USB 2.0 Hi-Speed (480 Mbit/s)
Alimentazione per porta	5 V, fino a 2 A sulla singola porta USB-C e 1,5 A sulla USB-A, ~2,3 A totali, con limitazione di corrente e sezionamento per porta
Sezionamento	VBUS (load switch) e D+/D- (switch analogico), staccati e riattaccati sempre insieme, in sequenza
Alimentazione hub	ingresso USB-C a 5 V / 3 A, senza USB-PD: va bene qualunque alimentatore USB-C
Upstream (verso il PC)	USB-C (USB 2.0)
Controllo	STM32G0B1 su porta interna dell'hub, interfaccia USB HID senza driver + CLI Python
Relè ausiliari	2 × SPDT su boccole a banana, contatti max 16 V / 3 A

Le motivazioni delle scelte (in particolare USB 2.0 invece di USB 3 e il non sezionare GND) sono in docs/architettura.md.

Struttura del repository

text

docs/        requisiti, architettura, protocollo di controllo, domande aperte
hardware/    progetto KiCad (schema, PCB, BOM)
firmware/    firmware del MCU di controllo
host/        strumento da riga di comando per il PC

Documenti

docs/requisiti.md — cosa deve fare il dispositivo
docs/architettura.md — schema a blocchi, scelte progettuali, componenti candidati, bilancio di potenza
docs/componenti.md — componenti candidati, package, fornitori, classe JLCPCB
docs/protocollo-controllo.md — bozza del protocollo HID tra PC e hub
docs/regole-pcb.md — stackup, piste, USB, alimentazione, piazzamento e verifiche di produzione
docs/pinout-mcu.md — piedinatura del MCU e note per il firmware
docs/domande-aperte.md — decisioni ancora da prendere

Licenze

Hardware (hardware/): CERN-OHL-W 2.0.
Firmware, libreria e CLI, documentazione (tutto il resto): MIT.

Stato

Requisiti, architettura e componenti definiti; schema elettrico v0.2 in KiCad e PCB iniziato (profilo e componenti che vincolano la scatola, vedi hardware/README.md). Prossimo passo: footprint mancanti e piazzamento del resto del PCB.

Parts

216

Qty	Value	Footprint	References
29	100n	Capacitor_SMD:C_0603_1608Metric	C1, C2, C10, C24, C101, C103, C104, C201, C203, C204, C301, C303, C304, C401, C403, C404 +13
17	100k	Resistor_SMD:R_0603_1608Metric	R22, R23, R42, R43, R44, R45, R46, R104, R105, R204, R205, R304, R305, R404, R405, R504 +1
16	1k	Resistor_SMD:R_0603_1608Metric	R3, R4, R90, R91, R92, R93, R106, R107, R206, R207, R306, R307, R406, R407, R506, R507
8	100n	Capacitor_SMD:C_0402_1005Metric	C25, C26, C27, C28, C29, C30, C37, C38
8	10k	Resistor_SMD:R_0603_1608Metric	R26, R27, R28, R29, R34, R47, R48, R49
8	56k	Resistor_SMD:R_0603_1608Metric	R102, R103, R202, R203, R302, R303, R402, R403
8	verde	LED_SMD:LED_0805_2012Metric	D90, D91, D92, D102, D202, D302, D402, D502
6	1u 25V	Capacitor_SMD:C_0603_1608Metric	C7, C106, C206, C306, C406, C506
6	20m 1% 2512	Resistor_SMD:R_2512_6332Metric	R5, R65, R66, R67, R68, R69
5	100 1206	Resistor_SMD:R_1206_3216Metric	R101, R201, R301, R401, R501
5	1u	Capacitor_SMD:C_0603_1608Metric	C21, C31, C32, C33, C35
5	22u 10V	Capacitor_SMD:C_0805_2012Metric	C102, C202, C302, C402, C502
5	AO3400A	Package_TO_SOT_SMD:SOT-23	Q101, Q201, Q301, Q401, Q501
5	PI3USB4002A	lcsc_footprints:C3657361_UQFN-10_L2_0-W1_5-P0_50-TL	U101, U201, U301, U401, U501
5	porta on/off	Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92	SW101, SW201, SW301, SW401, SW501
5	rosso	LED_SMD:LED_0805_2012Metric	D103, D203, D303, D403, D503
4	10u	Capacitor_SMD:C_0805_2012Metric	C5, C6, C8, C9
4	5.1k	Resistor_SMD:R_0603_1608Metric	R1, R2, R20, R21
4	M3	MountingHole:MountingHole_3.2mm_M3	H1, H2, H3, H4
4	USB-C	Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J101, J201, J301, J401
3	TPS2561ADRC	Package_SON:VSON-10-1EP_3x3mm_P0.5mm_EP1.65x2.4mm_ThermalVias	U4, U5, U6
2	100 DNP	Resistor_SMD:R_1206_3216Metric	R81, R82
2	100n 50V DNP	Capacitor_SMD:C_0805_2012Metric	C81, C82
2	15p C0G	Capacitor_SMD:C_0603_1608Metric	C22, C23
2	220u 10V	Capacitor_THT:CP_Radial_D6.3mm_P2.50mm	C3, C4
2	24.3k 1%	Resistor_SMD:R_0603_1608Metric	R60, R61
2	4.7k	Resistor_SMD:R_0603_1608Metric	R40, R41
2	G5Q-1 DC5	Relay_THT:Relay_SPDT_Omron-G5Q-1	K1, K2
2	INA3221	Package_DFN_QFN:Texas_RGV0016A_VQFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm	U7, U8
2	NC/NO	Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm	JP2, JP3
2	relè on/off	Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92	SW1, SW2
1	100n 50V	Capacitor_SMD:C_0603_1608Metric	C13
1	100u 10V	Capacitor_SMD:CP_Elec_6.3x5.8	C505
1	10n	Capacitor_SMD:C_0603_1608Metric	C12
1	12.0k 1%	Resistor_SMD:R_0603_1608Metric	R25
1	1M	Resistor_SMD:R_0603_1608Metric	R24
1	2.2n	Capacitor_SMD:C_0603_1608Metric	C11
1	20.5k 1%	Resistor_SMD:R_0603_1608Metric	R32
1	24MHz 12pF	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	33.2k 1%	Resistor_SMD:R_0603_1608Metric	R62
1	4.7u	Capacitor_SMD:C_0805_2012Metric	C20
1	4.7u	Capacitor_SMD:C_0603_1608Metric	C40
1	500mA	Fuse:Fuse_1812_4532Metric	F1
1	69.8k 1%	Resistor_SMD:R_0603_1608Metric	R30
1	9.53k 1%	Resistor_SMD:R_0603_1608Metric	R31
1	953 1%	Resistor_SMD:R_0603_1608Metric	R33
1	AP7361C-33E	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U1
1	BZT52C5V1	Diode_SMD:D_SOD-123	D4
1	Banana COM 1	Connector:Banana_Cliff_FCR7350B_S16N-PC_Horizontal	J5
1	Banana COM 2	Connector:Banana_Cliff_FCR7350B_S16N-PC_Horizontal	J7
1	Banana NC 1	Connector:Banana_Cliff_FCR7350R_S16N-PC_Horizontal	J6
1	Banana NC 2	Connector:Banana_Cliff_FCR7350R_S16N-PC_Horizontal	J8
1	MCP120T-300I/TT	Package_TO_SOT_SMD:SOT-23	U12
1	PORTA 7 (scorta)	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J3
1	SMAJ20A	Diode_SMD:D_SMA	D1
1	SS34	Diode_SMD:D_SMA	D2
1	STM32G0B1RET6	Package_QFP:LQFP-64_10x10mm_P0.5mm	U3
1	SWD	Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical_SMD	J4
1	TPS259470ARPWR	lcsc_footprints:C3662799_VQFN-10_L2_0-W2_0-P0_45-TL	U13
1	UART debug	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J9
1	ULN2003V12	Package_SO:SOIC-16_3.9x9.9mm_P1.27mm	U9
1	USB-A	Connector_USB:USB_A_Kycon_KUSBX-AS1N-B_Horizontal	J501
1	USB-C PWR IN	Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J1
1	USB-C UPSTREAM	Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J2
1	USB2517I-JZX	lcsc_footprints:QFN-64-1EP_9x9mm_P0.5mm_EP4.7x4.7mm_ThermalVias_0.3mm	U2
1	USBLC6-2SC6	Package_TO_SOT_SMD:SOT-23-6	D20
1	arancio	LED_SMD:LED_0805_2012Metric	D93

Questions

How big is the Devhub PCB?

It measures 172.5 × 85 mm and has 4 copper layers, 1.62 mm thick.

What parts does the Devhub use?

216 parts, built around the STM32G0B1RET6, USB2517I-JZX, PI3USB4002A and TPS2561ADRCR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Devhub KiCad files?

From the mpolci/devhub repository on GitHub, at the commit this page was made from: the board is hardware/devhub/devhub.kicad_pcb and its schematic hardware/devhub/devhub.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Devhub design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

STM32

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/mpolci-devhub" title="Devhub in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/mpolci-devhub.jpg" alt="Devhub" width="1200" height="900">

A picture that opens the board, for a README

[![Devhub](https://pcbkit.io/embed/boards/mpolci-devhub.jpg?size=s)](https://pcbkit.io/boards/mpolci-devhub)

Source

Repository: mpolci/devhub
Board file: hardware/devhub/devhub.kicad_pcb
Commit: fb603a0
Licence: MIT

Similar boards

2 layers63.8 × 44 mm
Pd sniffer
Badbird5907/pd-sniffer

44 parts
2 layers65 × 56.5 mm
UniversalStepperDriver
IRNAS/Universal-Stepper-Driver-Rpi
Universal stepper driver in shape of Raspberry Pi Hat. It supports all signals for Bipolar stepper motors thrue RPi header and have Unipolar stepper connectors and drivers.
88 parts2
4 layers100 × 70 mm
Data port x4
kartben/hw-testing-rack
3D-printed, tilted test shelf for 16 dev boards: sliding drawers, per-bay ESP32-S3 running Zephyr (USB/IP, power switching, metering), KiCad PCBs, OpenSCAD parts, BOM and an interactive 3D viewer
290 parts
2 layers100 × 102 mm
Esp32-c3-dip controller
haya1010/esp32-c3-safe-dip-led-controller
Protected ESP32-C3 2.54 mm DIP controller with USB-C and 3-channel 5/12/24 V LED PWM outputs
63 parts
4 layers90 × 70 mm
InclinationMeter
soldernerd/InclinationMeter
A battery-powered, Bluetooth-enabled precision electronic level instrument for machine tool geometry inspection and granite surface plate qualification.
118 parts
2 layers52.5 × 26 mm
Netzteil
kkroesch/raspower
DC-Step-Down for powering Raspberry Pi
19 parts
4 layers100 × 100 mm
DMXion 4port node
NEOgHacking/DMXion_4Port_Node
A 4 port dmx node with rdm funtionallity. Connects via ARTNET or sACN
275 parts2GPL-3.0
2 layers82 × 70 mm
NODO ACCESO
DavidManzano04/control-acceso-iot
Sistema IoT de control de acceso y asistencia docente con RFID: firmware ESP32 + Hikvision y plataforma web Flask (trabajo de grado UCEVA)
58 parts