4 layers60 × 60 mm
Usb switch
alvarop/debugotron
Debugotron is a collection of debugging/automation tools I've wanted in the past but didn't have access to. Currently, the tools include:
77 parts52BSD-3-Clause
4 layers30 × 20 mm
Swd switch
alvarop/debugotron52Debugotron is a collection of debugging/automation tools I've wanted in the past but didn't have access to. Currently, the tools include:
- Size
- 30 × 20 mm
- Copper layers
- 4
- Thickness
- 0.8 mm
- Parts
- 28
- Nets
- 27
- Pads
- 120
- Tracks, vias
- 276, 49
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 16 Jan 2022
- Updated
- 11 Oct 2026
Overview
Swd switch is an open-source printed circuit board by alvarop, from the alvarop/debugotron repository on GitHub, published under the BSD-3-Clause licence. It is a 4-layer board of 30 × 20 mm with 28 parts on 27 nets, routed with 276 tracks and 49 vias.
It is built around the SN74LVC2G66DCU, SN74AHC1G14DBVR and SN74AHC1G32DBVR, with the SN74LVC1G80DCKRE4, 20021121-00010C4LF and PTS636 SL43 SMTR LFS among its other parts. Its parts include 6 resistors, 6 ICs, 4 capacitors, 3 connectors and 1 diode. It belongs with the interfaces and adapters boards of this library.
Main components
7
SN74LVC2G66DCU
VSSOP-8-0.5mm-40℃~+85℃ 1.65V~5.5V 10.5ns 14pF 175MHz 1:1 2 3.9ns 6Ω 800ps VSSOP-8-0.5mm Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
SN74AHC1G14DBVR
SOT-23-5-40℃~+125℃ 1 1 14ns@5V,50pF 1uA 2V~5.5V 74AHC 8mA 8mA SOT-23-5 Logic Gates ROHSTECH PUBLICLogic GatesSN74AHC1G32DBVR
SOT-23-5SOT-23-5 Logic Gates ROHSTECH PUBLICLogic Gates
SN74LVC1G80DCKRE4
SC-70-5-40℃~+125℃ 1 1.1ns 1.65V~5.5V 10uA 160MHz 24mA 24mA 3.5pF 3.8ns@5V,15pF 400ps 74LVC D-Type Push-Pull Rising Edge SC-70-5 Flip Flops ROHSTexas InstrumentsFlip Flops
20021121-00010C4LF
SMD,P=1.27mm1.27mm 1.27mm 10P 2 2x5P 3.05mm Black Copper alloy Gold Pin Header Surface Mount,Vertical SMD,P=1.27mm Pin Headers ROHSAmphenolPin HeadersPTS636 SL43 SMTR LFS
SMD,6x3.5mm-40℃~+90℃ 1.3N 12V 50mA Gull Wing IP40 Rectangular Button SPST-NO Surface Mount,Vertical SMD,6x3.5mm Tactile Switches ROHSC&KTactile Switches
USB4515-GF-A
SMD-30℃~+85℃ 1 3A 48V 6P Black Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.mdDebugotron!
Debugotron is a collection of debugging/automation tools I've wanted in the past but didn't have access to. Currently, the tools include:
SWD to USB-C!
Have you ever wanted to debug your device over USB-C? Sometimes there's not enough room for a JTAG/SWD connector, or even TAGConnect pads! The USB-C specification has a Debug Accessory Mode feature that allows for this. I have a Twitter thread with additional details. Here's an unrolled version for easier reading.
SWD to USB-C Programmer
Since the current adapter uses an ATTiny24a, I made a different programmer adapter for it
Example Target
This is a simple STM32L4 board that implements USB-C DAM (the "proper way") as an example.
SWD Switch
Tool that allows connecting/disconnecting the SWD/JTAG lines (Via ARM 10-pin connector) with a pushbutton (or external signal). This can be useful when trying to measure ultra low power consumption on a device while the debugger is connected (but not necessarily running/attached).
USB-C Switch
This one is more of an automation tool. I've always wanted to automate firmware testing. Sometimes, having USB connected is necessary to program/communicate with a device, but at the same time, having USB connected changes the power characteristics of the test (or just operating mode).
For example, you might want to automatically test the power consumption of a battery powered device every night with the latest firmware. In order to run the test, you might have to connect to the device, flash it, then disconnect USB. The USB-C switch will allow software-controlled power and data connect/disconnects to a USB-C device. Depending on the configuration, it will also allow full 20V@5A pass-through by allowing USB-PD communication over the CC lines.
In the cases where you want to communicate with a device over USB while still powering it via 20V (or anything higher than 5V), a USB switch allows for a different USB cable to be used for data only, while power is taken from a separate USB-C port.
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R6 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_D3.0mm | TP1, TP2, TP3, TP4, TP5 |
| 4 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4 |
| 3 | SN74LVC2G66 | alvarop:SN74LVC2G66-VSSOP | U3, U4, U5 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | SN74AHC1G14 | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | SN74LVC1G32DBVR | snapeda:SOT95P280X145-5N | U2 |
| 1 | SN74LVC1G80DCKR | snapeda:SOT65P210X110-5N | U1 |
| 1 | SWD_IN | snapeda:SAMTEC_FTSH-105-01-F-DV-P-TR_alt | J3 |
| 1 | SWD_OUT | snapeda:SAMTEC_FTSH-105-01-F-DV-P-TR_alt | J5 |
| 1 | SW_Push | alvarop:PTS636_G | SW1 |
| 1 | USB_C_Receptacle_USB2.0 | alvarop:USB4515-GF-A | J2 |
The 26 most common of 28 parts.
Questions
How big is the Swd switch PCB?
It measures 30 × 20 mm and has 4 copper layers, 0.8 mm thick.
What parts does the Swd switch use?
28 parts, built around the SN74LVC2G66DCU, SN74AHC1G14DBVR, SN74AHC1G32DBVR and SN74LVC1G80DCKRE4. 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 Swd switch KiCad files?
From the alvarop/debugotron repository on GitHub, at the commit this page was made from: the board is hw/swd_switch/swd_switch.kicad_pcb and its schematic hw/sample_target/sample_target.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Swd switch design in my own project?
Its repository publishes it under the BSD-3-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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