4 layers100 × 100 mm
2 layers34.3 × 16 mm
Usb uart
florolf/usb-uart-shift7USB->UART adapter with level shifting
- Size
- 34.3 × 16 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 29
- Pads
- 145
- Tracks, vias
- 277, 42
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 12 May 2025
- Updated
- 17 May 2025
Overview
Usb uart is an open-source printed circuit board by florolf, from the florolf/usb-uart-shift repository on GitHub. It is a 2-layer board of 34.3 × 16 mm with 40 parts on 29 nets, routed with 277 tracks and 42 vias.
It is built around the FT230XQ-R, SN74LVC1T45DCKRE4 and SRV05-4, with the CL05B104KB54PNC, 0402CG470J500NT and GZ2012D101TF among its other parts. Its parts include 14 capacitors, 14 resistors, 6 ICs, 3 connectors and 2 diodes. It belongs with the interfaces and adapters boards of this library.
Main components
7
FT230XQ-R
QFN-16-EP(4x4)-40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART QFN-16-EP(4x4) USB Converters ROHSFTDIUSB Converters
SN74LVC1T45DCKRE4
SC-70-6-40℃~+85℃ 1 1 1.65V~5.5V 1.65V~5.5V 24mA 24mA 420Mbps Bidirectional Level translator Power-off protection、Output enable high-impedance Tri-State SC-70-6 Translators, Level Shifters ROHSTexas InstrumentsTranslators / Level Shifters
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
CL05B104KB54PNC
0402100nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT0402CG470J500NT
040247pF 50V C0G ±5% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSGuangdong Fenghua Advanced Tech (FH)Multilayer Ceramic Capacitors MLCC - SMD/SMT
GZ2012D101TF
08051 100Ω@100MHz 150mΩ 800mA ±25% 0805 Ferrite Beads ROHSSunlordFerrite Beads
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdusb-uart-shift
This is an FT230X-based USB-UART adapter with built-in level shifting. This allows talking to targets using different I/O voltage levels (1.8V to 5V), but it's especially useful to avoid backpowering a target through the TX line.
This board can be assembled by JLCPCB PCBA for about $5 each, see the fab/
directory for Gerber/BOM/CPL data.
Usage
The I/Os on the right-angle header (J1) are:
->(output, UART TX from the perspective of the adapter)<-(input, RX)G(GND)RTS(output)CTS(input)
The pins are arranged such that a 4-pin receptacle on the target is sufficient when designing specifically for interfacing with this adapter if flow control is not needed.
Level-shifting is configured through the 4-pin header (J2). When the I/O
reference voltage is available from the target it is recommended to connect it
to Vt and leave J2 open.
Alternatively, you can connect a jumper between 3.3 and Vt or 5 and Vt
on J2 to set the I/O voltage to 3.3V or 5V (strictly speaking USB VBUS),
respectively. However, in this case we cannot detect an unpowered target and
the usual backpowering considerations will apply. You can also just connect a
lab power supply to Vt and G.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C5, C6, C7, C9, C10, C13, C14 |
| 8 | 10k | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10, R11, R12, R13, R14 |
| 4 | SN74LVC1T45DCK | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U3, U4, U5, U6 |
| 2 | 1k2 | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | 27R | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 47p | Capacitor_SMD:C_0402_1005Metric | C11, C12 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 1 | 100R @ 100MHz | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J3 |
| 1 | FT230XQ | Package_DFN_QFN:QFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm | U2 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | Yellow | LED_SMD:LED_0603_1608Metric | D2 |
Questions
How big is the Usb uart PCB?
It measures 34.3 × 16 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Usb uart use?
40 parts, built around the FT230XQ-R, SN74LVC1T45DCKRE4, SRV05-4 and CL05B104KB54PNC. 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 uart KiCad files?
From the florolf/usb-uart-shift repository on GitHub, at the commit this page was made from: the board is usb-uart.kicad_pcb and its schematic usb-uart.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Usb uart design in my own project?
Its repository states no licence, so its author keeps all rights: ask florolf before reusing the design.
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