2 layers43 × 20 mm
Sample target basic
alvarop/swd2usbc
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!
46 parts29CC0-1.0
4 layers51.8 × 20 mm
Sample target
alvarop/swd2usbc29Have 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!
- Size
- 51.8 × 20 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 79
- Pads
- 240
- Tracks, vias
- 458, 81
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 5 Jan 2025
- Updated
- 16 Mar 2025
Overview
Sample target is an open-source printed circuit board by alvarop, from the alvarop/swd2usbc repository on GitHub, published under the CC0-1.0 licence. It is a 4-layer board of 51.8 × 20 mm with 57 parts on 79 nets, routed with 458 tracks and 81 vias.
It is built around the RP2040, LM358QT and W25Q128JVSIQ, with the MIC5504-3.3YM5-TR, SN74AHC1G08DBVR and CL05B104KB54PNC among its other parts. Its parts include 20 capacitors, 12 resistors, 7 ICs, 3 diodes and 2 connectors. It belongs with the RP2040 boards of this library.
Main components
9
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
LM358QT
DFN-8-EP(2x2)0℃~+70℃ 1.1MHz 1.1V/us 2 20mA 20nA 2mV 3V~30V 55nV/√Hz@1kHz 700uA 7nA 85dB 9uV/℃ Built-in compensation DFN-8-EP(2x2) Operational Amplifier ROHSSTMicroelectronicsOperational Amplifier
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
MIC5504-3.3YM5-TR
SOT-23-5-40℃~+125℃@(Tj) 1 160mV@(300mA) 175uVrms 3.3V 300mA 38uA 5.5V 60dB@(1kHz) Fixed Over Current Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSN74AHC1G08DBVR
SOT-23-5-40℃~+125℃ 1 1.5V、2.1V、3.85V 1.9V~2V、2.58V、2.9V~3V、3.94V、4.4V~4.5V 100mV、360mV 1uA 2 2V~5.5V 5.8ns@5V,50pF 500mV、900mV、1.65V 74AHC AND Gate SOT-23-5 Logic Gates ROHSTECH PUBLICLogic Gates
CL05B104KB54PNC
0402100nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
SKRKAEE020
SMD,3.9x2.9mm-40℃~+85℃ 1.6N 12V 2.9mm 200,000 Cycles 2mm 3.9mm 50mA Round Button SMD(SMT) Tab SPST-NO Surface Mount,Vertical SMD,3.9x2.9mm Tactile Switches ROHSALPSALPINETactile Switches
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
UT11113-11602-7H
SMD-55℃~+85℃ 1 1.25A 10000 times 24P 7.45mm Black Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSFOXCONNUSB Connectors
README
README.mdSWD2USBC 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!
For history and all of the details, check out my detailed write up here.
SWD2USBC
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 Firmware
The ATTiny firmware doesn't do much. It reads the voltage on the CC1/CC2 line that is pulled up and determines the available charge current. It then pulls up CC1 and CC2 to provide the charge current to the device under Debug Accessory Mode.
SWD2USBC Basic
Simple adapter with no Debug Accessory Mode. Assumes target SWD lines wired up directly to TX1/2 as listed above. Requires USB3/Thunderbolt C to C cable to connect to target.
Sample Target
Example target device. Fully featured with CC1/2 comparators to connect/disconnect SWD lines if Debug Accessory Mode is active. Target is an RP2040 instead of STM32 since it's easier to source.
Sample Target Firmware
The sample target firmware does basic USB charge detection using the CC lines. When the Debug Accessory Mode is enabled, both CC1/CC2 are used, otherwise, the single CC line is used. There's an LED (D3) which lights up when Debug Accessory Mode is enabled.
The charge current is printed out over UART, but it is also displayed using the two LEDs. The blink patterns are:
- 500mA - LED1 (D1) blinks
- 1500mA - LED2 (D2) blinks
- 3000mA - Both LED1 (D1) and LED2 (D2) blink at the same time
- Other/Error - Both LED1 (D1) and LED2 (D2) alternating blink
Sample Target Basic
Basic example target. Similar to the sample target above, but does not include any comparators/switches. SWD lines are directly connected to the USB-C connector.
SWD2USBC Programmer
Simple adapter PCB to connect the AVRISP V2 connector to USB-C to program the ATTiny in the SWD2USBC device.
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C3, C4, C7, C9, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20 |
| 9 | , , , , , , , , | ||
| 5 | 1k | Resistor_SMD:R_0402_1005Metric | R3, R6, R7, R8, R12 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C8, C10 |
| 3 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R11 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C5, C6 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | SW_Push | easyeda:SW-SMD_L3.9-W3.0-P4.45 | SW1, SW2 |
| 2 | TMUX1511PWR | snapeda:SOP65P640X120-14N | U6, U7 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 240k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | LM358_DFN | Package_DFN_QFN:DFN-8-1EP_2x2mm_P0.5mm_EP1.05x1.75mm | U4 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U3 |
| 1 | SN74AHC1G08DBVR | snapeda:SOT95P280X145-5N | U5 |
| 1 | USB_C_Receptacle | alvarop:UT11113-11602-7H | J1 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U2 |
The 56 most common of 57 parts.
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Questions
How big is the Sample target PCB?
It measures 51.8 × 20 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Sample target use?
57 parts, built around the RP2040, LM358QT, W25Q128JVSIQ and MIC5504-3.3YM5-TR. 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 Sample target KiCad files?
From the alvarop/swd2usbc repository on GitHub, at the commit this page was made from: the board is sample-target/sample-target.kicad_pcb and its schematic sample-target-basic/sample-target-basic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sample target design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).