HardLabs

SWD2USBC

alvarop·swd2usbc·swd2usbc/swd2usbc.kicad_pcb

SWD2USBC PCB layout, top view — open source AVR/Arduino board by alvarop

About the SWD2USBC PCB

SWD2USBC is an open source AVR/Arduino PCB design by alvarop, published on GitHub under the CC0-1.0 license. It is a 4-layer board measuring 25.8 × 16 mm, with 16 components from 13 distinct parts.

Its main chip is the ATTINY24A-MMH, from the AVR/Arduino family. By type, the board carries 8 resistors, 3 connectors, 2 diodes, 2 capacitors and 1 IC.

It belongs with the usb & debug tools designs in this gallery.

From the project

Have you ever wanted to debug your device over USB-C? Sometimes there's not enough room for a JTAG/SWD connector, or even Tag-Connect pads!

Have you ever wanted to debug your device over USB-C? Sometimes there's not enough room for a JTAG/SWD connector, or even Tag-Connect pads!

For history and all of the details, check out my detailed write up here.

Full featured adapter with Debug Accessory Mode support. Includes an ATTiny microcontroller to set the correct pull-up resistors on CC1/CC2 to provide accurate charge current to the target. Has a USB-C plug so no extra USB-C cable required

SWD2USBC, from the project README
From the project README

Main components on the SWD2USBC

ATTINY24A-MMH

SWD2USBC bill of materials (BOM)

16 components, 13 distinct parts.

QtyPartRefs
1
ATTINY24A-MMH
ATtiny24-20M
Microchip
U1
1
USB4105-GF-A
USB_C_Receptacle_USB2.0
GCT
J1
1
FTSH-105-01-F-DV-K
Conn_ARM_JTAG_SWD_10
Samtec Inc.
J2
1
1054440011
USB_C_Plug
Molex
P1
1
SML-D12M8WT86
GREEN
Rohm Semiconductor
D1
1
SML-D12U1WT86
RED
Rohm Semiconductor
D2
1
CL05A105KO5NNNC
1uF
Samsung Electro-Mechanics
C1
1
CL05B104KO5NNNC
0.1uF
Samsung Electro-Mechanics
C2
2
RC0402FR-075K1L
5.1k
Yageo
R1, R2
1
RC0402FR-0710KL
10k
Yageo
R3
2
RC0402FR-0722KL
22k
Yageo
R4, R5
1
RC0402FR-0756KL
56k
Yageo
R6
2
RC0402FR-071KL
1k
Yageo
R7, R8

SWD2USBC design files

The KiCad project lives in the alvarop/swd2usbc repository on GitHub; these links point at the commit this page was built from.

SWD2USBC: common questions

What microcontroller does the SWD2USBC use?

The SWD2USBC is built around the ATTINY24A-MMH, from the AVR/Arduino family.

How big is the SWD2USBC PCB?

The SWD2USBC measures 25.8 × 16 mm, has 4 copper layers and is 0.8 mm thick.

How many components are on the SWD2USBC?

16 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the SWD2USBC design files?

From the alvarop/swd2usbc repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the SWD2USBC design in my own project?

Yes, under the terms of its CC0-1.0 license, which alvarop chose for the repository.

Can I test firmware for the SWD2USBC without the hardware?

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

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