CP2102(6-pin) USB 2.0 to TTL UART serial converter Module

CP2102 (6-pin) USB 2.0 to TTL UART Serial Converter is an essential bridge component that simplifies the process of connecting TTL-level serial devices, such as microcontrollers and embedded systems, directly to a PC’s USB port. Built around the highly reliable Silicon Labs CP2102 single-chip USB to UART bridge, this compact module offers a highly integrated solution that includes the USB transceiver, oscillator, and UART in a small footprint. Consequently, it requires minimal external components, resulting in a clean and efficient design. The 6-pin interface provides standard connectivity points—including 3.3V, 5V, TXD, RXD, GND, and DTR/RTS—making it highly compatible with popular platforms like Arduino, ESP8266, and Raspberry Pi. Therefore, developers widely choose the CP2102 module for programming, debugging, and general serial communication tasks.

Key Features:

• Integrated Transceiver: Features an on-chip USB 2.0 full-speed transceiver, eliminating the need for external crystal components and providing reliable data transfer up to 12 Mbps.
• High Baud Rate Support: The converter supports data rates ranging from 300 bps up to an impressive 1 Mbps, catering to both slow and high-speed communication needs.
• Selectable Power Output: Provides both 3.3 V and 5 V output power rails, allowing the user to select the appropriate voltage for powering the target board.
• Driver Support: Silicon Labs provides robust driver support for all major operating systems, including Windows, macOS, and Linux, ensuring plug-and-play functionality.
• Hardware Handshaking: Includes DTR/RTS or CTS/DSR signals, which facilitate flow control for advanced serial communication protocols.

Technical Specifications:

• Chipset: Silicon Labs CP2102
• USB Standard: USB 2.0 Full Speed (12 Mbps)
• Serial Protocol: UART (Asynchronous Serial Data)
• Baud Rate Range: 300 bps to 1 Mbps
• Output Voltage Options: 3.3 V and 5 V DC selectable (Via internal jumper or dedicated pin)
• Maximum Output Current: ≈ 500 mA (Depending on host USB port capabilities)
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: Small Form Factor Module
• Connector Interface: USB Type A Male (PC side) and 6-Pin Header (TTL side)
• LED Indicators: Features indicator LEDs for Power (PWR), Transmit (TXD), and Receive (RXD) activity.
• Protection: Includes integrated transient suppression diodes on the USB lines.

Dimensions:

• Module Length: ≈ 42 mm
• Module Width: ≈ 16 mm
• Header Pitch: 2.54 mm (Standard)
• Weight: ≈ 4 g (Extremely lightweight)

Pinout and Wiring:

• GND: Connect to the ground pin of the target device. (Essential for voltage reference.)
• TXD (Transmit): Connect this pin to the RXD (Receive) pin of the target device.
• RXD (Receive): Connect this pin to the TXD (Transmit) pin of the target device.
• VCC (5V/3.3V): Provides the selected power voltage to the target device.
• 3V3/5V (Jumper Select): Select the desired logic level (TTL voltage) for TXD/RXD signals. (Note: Some modules use a jumper to select VCC.)
• DTR/RTS: Data Terminal Ready / Request to Send. Furthermore, use this pin for automatic reset/programming of microcontrollers (e.g., Arduino/ESP boards).

Datasheet Reference:

• Download Silicon Labs CP2102/9 Datasheet

Commonly Used in:

• Microcontroller Development: Primarily used as the programming and debugging interface for 3.3V and 5V microcontrollers lacking native USB (e.g., ATmega, PIC).
• SBC Configuration: Configuring network settings or accessing the console on devices like Raspberry Pi or router firmwares.
• GPS Modules: Establishing a serial connection to read NMEA data from various GPS units.

Applications:

• Firmware Uploading: Flashing new firmware onto development boards like Arduino Pro Mini or ESP-01 modules.
• Data Logging: Acting as a reliable interface for capturing real-time sensor data from TTL devices to a computer.
• Legacy Device Interfacing: Connecting older serial-only industrial or diagnostic equipment to modern computers.

Equivalent Models:

• FTDI FT232RL: This is a highly popular alternative USB to serial chip, known for its extensive driver support and flexibility.
• CH340G: A common, lower-cost alternative often found in budget modules, however, it generally offers a simpler feature set than the CP2102.
• PL2303HX: Another established USB to serial solution, suitable for applications where baud rate requirements are moderate.

Package Includes:

• 1 x CP2102 (6-pin) USB 2.0 to TTL UART Serial Converter Module