The CP2103 is a highly-integrated USB-to-UART bridge controller providing a simple solution for updating RS-232 or RS-485 designs to USB using a minimum of components and PCB space. It includes new features such as configurable I/O levels (3.3 to 1.8V) and four general purpose I/O signals for system status and control. It includes the standard USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM and asynchronous serial data bus (UART) with full modem control signals in a compact 5 x 5 mm MLP-28 package. No other external USB components are required.
The CP2103 is a highly‑integrated USB‑to‑UART bridge controller that enables easy conversion of legacy RS‑232 or RS‑485 designs to USB with minimal external components. It includes a USB 2.0 full‑speed function controller, transceiver, oscillator, EEPROM and UART with full modem control in a compact 5 × 5 mm QFN‑28 package.
The document lists electrical specifications, pin assignments, and the CP2103EK evaluation kit hardware. It also details supported UART data formats, baud rates up to 1 Mbps, four configurable GPIO signals, and power options for both self‑powered and USB‑bus‑powered operation.
| Regulator Input Voltage (REGIN) | 4.0 V – 5.25 V |
|---|---|
| Regulator Output Voltage (Vpp) | 3.0 V – 3.6 V |
| Supply Current (USB active) | 25 mA |
| Self‑powered Supply Voltage | 3.0 V – 3.6 V |
| USB‑bus Powered Supply Voltage | 4.0 V – 5.25 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package Type | 28‑pin QFN (MLP‑28) |
| Maximum UART Baud Rate | 1 Mbps |
| Number of GPIO Signals | 4 |
The CP2103 can be self‑powered from 3.0 V to 3.6 V or USB‑bus powered from 4.0 V to 5.25 V.
The CP2103 supports UART baud rates up to 1 Mbps.
The device provides four general‑purpose I/O signals.
It is supplied in a 28‑pin QFN (MLP‑28) lead‑free package.