2 layers50.9 × 17.8 mm
2 layers20.5 × 15.1 mm
CP2102USB2UART
mpek29/CP2102USB2UART🔌 CP2102 USB to UART reverse-engineered
- Size
- 20.5 × 15.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 32
- Pads
- 128
- Tracks, vias
- 130, 11
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Feb 2025
- Updated
- 1 Mar 2025
Overview
CP2102USB2UART is an open-source printed circuit board by mpek29, from the mpek29/CP2102USB2UART repository on GitHub. It is a 2-layer board of 20.5 × 15.1 mm with 13 parts on 32 nets, routed with 130 tracks and 11 vias.
It is built around the CP2102 and UJ2-MIBH-G-SMT-TR. Its parts include 4 resistors, 3 capacitors, 3 diodes, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
Main components
2README
README.mdCP2102USB2UART
🚀 Overview
An open-source reverse-engineered version of the CJMCU CP2102 USB to UART TTL adapter, based on the original component available here. This project aims to provide insights into USB-to-serial communication and offer a customizable alternative for embedded system developers.
🎯 Purpose
- 🔍 Reverse engineering: Understanding the design and functionality of the CP2102USB2UART.
- 🛠️ Skill development: Enhancing expertise in PCB design and USB-to-serial communication.
- 🔄 Future adaptation: Leveraging this knowledge to develop custom USB-to-UART solutions for embedded systems.
📝 Features Comparison: Original vs. Reverse-Engineered
| Feature | Original Module | Reverse-Engineered Version |
|---|---|---|
| 🖥️ PCB Design | Proprietary | Open-source & customizable |
| 🔌 USB Connector | Micro USB | Micro USB |
| 🏷️ Chipset | CP2102 | CP2102 |
| 📌 Pin Mapping | 6-Pin UART TTL | 6-Pin UART TTL |
| ⚡ Supported Voltage | 3.3V / 5V | 3.3V / 5V |
| 👐 Mechanical Drawing |  |  |
| 📝 Reverse-Engineered Schematic | N/A |  |
| 📷 Photo |  |  |
🛠️ How to Use
📌 Wiring Guide
| CP2102 Pin | Description |
|---|---|
| TXD | Transmit Data |
| RXD | Receive Data |
| GND | Ground |
| 3V3 | 3.3V Power Output |
| 5V | 5V Power Output |
| DTR | Data Terminal Ready |
🌟 License
This project is open-source. Feel free to use, modify, and contribute! 🚀
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D3 |
| 3 | R | Resistor_SMD:R_0805_2012Metric | R1, R2, R3 |
| 2 | C | Capacitor_SMD:C_0805_2012Metric | C2, C3 |
| 1 | C | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | CP2102 | Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.75x3.75mm_ThermalVias | U1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | R | Resistor_SMD:R_1206_3216Metric | R4 |
| 1 | UJ2-MIBH-G-SMT-TR | footprints:CUI_UJ2-MIBH-G-SMT-TR | J2 |
Questions
How big is the CP2102USB2UART PCB?
It measures 20.5 × 15.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CP2102USB2UART use?
13 parts, built around the CP2102 and UJ2-MIBH-G-SMT-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 CP2102USB2UART KiCad files?
From the mpek29/CP2102USB2UART repository on GitHub, at the commit this page was made from: the board is design/CP2102USB2UART/CP2102USB2UART.kicad_pcb and its schematic design/CP2102USB2UART/CP2102USB2UART.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CP2102USB2UART design in my own project?
Its repository states no licence, so its author keeps all rights: ask mpek29 before reusing the design.
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