2 layers39.7 × 14 mm
Sample target
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:
31 parts52BSD-3-Clause
4 layers60 × 60 mm
Usb 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
- 60 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 68
- Pads
- 272
- Tracks, vias
- 502, 95
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 16 Jan 2022
- Updated
- 11 Oct 2026
Overview
Usb 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 60 × 60 mm with 77 parts on 68 nets, routed with 502 tracks and 95 vias.
It is built around the FSUSB30L10X, TUSB2036VF and AP22804AW5, with the MIC5504-3.3YM5, NX20P5090UK and SLG7NT402VTR among its other parts. Its parts include 29 resistors, 22 capacitors, 8 connectors, 6 ICs and 1 diode.
Main components
6
FSUSB30L10X
MicroPak-10(1.6x2.1)-40℃~+85℃ 1uA 3V~4.3V 480Mbps Enable/shutdown function USB MicroPak-10(1.6x2.1) Interface - Specialized ROHSonsemiInterface - Specialized
TUSB2036VF
LQFP-32(7x7)LQFP-32(7x7) USB HUB Controllers ROHSTexas InstrumentsUSB Converters
AP22804AW5
SOT-25-40℃~+85℃ 1 2.5A 2.7V~5.5V 50mΩ Active High、Active Low High Side Switch Short-Circuit Protection(SCP)、Overcurrent Protection(OCP)、Over Temperature Protection SOT-25 Power Distribution Switches ROHSDiodes IncorporatedPower Distribution SwitchesMIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsNX20P5090UK
WLCSP15(2.56x1.54)WLCSP15(2.56x1.54) Power Distribution Switches ROHSNXP SemiconductorsPower Distribution Switches
SLG7NT402VTR
FC-TDFN-8(1.5x2)-20℃~+70℃ 1 2.5V~5.5V 7.8mΩ Active High Load Switch FC-TDFN-8(1.5x2) Power Distribution Switches ROHSRenesas ElectronicsPower Distribution Switches
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
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 1uF | Capacitor_SMD:C_0402_1005Metric | C4, C5, C6, C7, C10, C11, C14, C16, C17, C20 |
| 8 | 27 | Resistor_SMD:R_0402_1005Metric | R3, R4, R5, R6, R7, R8, R9, R10 |
| 7 | 0 | Resistor_SMD:R_0402_1005Metric | R13, R14, R15, R16, R18, R19, R22 |
| 7 | 10k | Resistor_SMD:R_0402_1005Metric | R11, R12, R21, R23, R26, R27, R28 |
| 5 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C2, C12, C13, C15, C22 |
| 4 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J3, J4, J5, J6 |
| 4 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1, FB2, FB3, FB4 |
| 2 | 1.5k | Resistor_SMD:R_0402_1005Metric | R17, R20 |
| 2 | 33pF | Capacitor_SMD:C_0402_1005Metric | C8, C9 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 1 | 0.01uF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 100 | Resistor_SMD:R_0402_1005Metric | R29 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C18 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C21 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 62k | Resistor_SMD:R_0402_1005Metric | R25 |
| 1 | 6MHz | Crystal:Crystal_SMD_HC49-SD | Y1 |
| 1 | AP22804AW5 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | C_Small | Capacitor_SMD:C_0402_1005Metric | C19 |
| 1 | D_Schottky | alvarop:CD123-B140LR | D1 |
| 1 | FSUSB30L10X | Package_SO:MSOP-10_3x3mm_P0.5mm | U2 |
| 1 | GND | alvarop:RCWCTE | TP1 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | NX20P5090 | alvarop:NX20P5090UK | U6 |
| 1 | SLG7NT402V | alvarop:FC-TDFN-8 | U5 |
| 1 | TUSB2036 | Package_QFP:LQFP-32_7x7mm_P0.8mm | U3 |
| 1 | alt_source_usb | alvarop:USB4105-GF-A | J2 |
| 1 | extra_usb | alvarop:UE27ACX410X | J7 |
| 1 | host_usb | alvarop:USB4105-GF-A | J1 |
| 1 | target_usb | alvarop:USB4105-GF-A | J8 |
The 72 most common of 77 parts.
Questions
How big is the Usb switch PCB?
It measures 60 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Usb switch use?
77 parts, built around the FSUSB30L10X, TUSB2036VF, AP22804AW5 and MIC5504-3.3YM5. 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 Usb switch KiCad files?
From the alvarop/debugotron repository on GitHub, at the commit this page was made from: the board is hw/usb_switch/usb_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 Usb 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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