How to Use CP2102 UART Module to Program Arduino Pro Mini?
CP2102N USB TO UART EVALUATION K
CP2102 UART module is the upgraded version of RS-232 Communicator introduced by Silicon Labs. This article will talk about how to use CP2102 UART Module to Program Arduino Pro Mini. Welcome your RFQ

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CP2102 Pinout

CP2102 Pinout
Pin Name | Function |
VCCIO | Positive Power Supply pin |
GND | Ground pin |
RST | Reset pin |
TXD | UART Serial Transmission pin |
RXD | UART Serial Reception pin |
CTS | Active low Clear-to-Send input pin. It supports the Xon/Xoff handshake mechanism. |
RTS | Active low Ready-to-Send output pin It supports the Xon/Xoff handshake mechanism. |
DSR | Active low Data Set Ready input pin. It shows that it is ready to accept the data.. |
DTR | Active low Data Terminal Ready output pin. It shows that the terminal is ready for data transfer. |
DCD | Active low Data Carrier Detect input pin. It indicates when a good carrier is received from the modem. |
SUSPEND | Active high USB suspend state pin |
SUSPEND | Active low USB suspend state pin |
RI | Active low Ring Indicator input pin. When it changes its state, a hardware interrupt is produced. |
CP2102 Description
Silicon Labs introduced the CP2102 UART module, which is an updated version of the RS-232 Communicator. It's a USB to UART Bridge with a single CP2102 chip that runs at a full USB speed of 12Mbps. The CP2102 has an inbuilt high-performance serial data transmitter, as well as suspend/resume signals for chip energy control and external circuitry. The module enables handshaking and handles command requests from the USB host to control the asynchronous serial UART port's activity.
It also includes a 1024-byte PROM and a 48-MHz internal oscillator. Two voltage regulators and matching pull-up resistors are built within the device. The CP2102 is compatible with existing COM ports and Windows/Linux/Mac OS-X/OS-9. It does, however, necessitate the use of drivers to initiate serial connections.
CP2102 Feature
CP2102 UART module is integrated with a high-speed transceiver.
CP2102 has a 12Mbps full-speed USB Specification 2.0 compliant.
The module is embedded with two voltage regulator circuits i.e. 3.3V and 3.45V and a reset circuit.
For the power control, the module is integrated with Suspend pins.
It supports the XOn/XOff handshake mechanism.
CP2102 is compatible with existing drivers and COM ports.
The module requires no external pull-up resistors.
CP2102 Application
Data Communication
Debug Purposes
Microcontroller programming
Prototypes
CP2102 Block Diagram
The following figure shows the block diagram of CP2102:

CP2102 Block Diagram
How to Use CP2102 UART Module to Program Arduino Pro Mini?
How does data transmission happen?
The USB port is used to connect the tiny chipset to the computer. The microcontroller unit's RX and TX signals are connected to the module's RX and TX signals. The modules connect to the host PC through a serial port. The information is sent from the host PC to the module, which converts it to UART signals that are sent to the microcontroller through the UART protocol.
Interfacing Arduino Pro Mini
This USB to serial converter chip can be used to program Arduino pro mini and other Arduino modules that do not include an integrated USB programmer.
Install CP2102 UART Module Drivers
You must first install drivers before using this module. When you connect this USB module to a computer's USB port, the necessary drivers are automatically installed. However, if drivers aren't installed automatically, you'll have to do it manually. The first step is to install drivers in order to get things up and running. To install the drivers, follow the procedures below.
Software and Tools > CP210x Windows Drivers > Download and Install
Open Device Manager and check the COM port.
If it is detected, it is ready to be used. Open Arduino IDE > Tools > Board > Select Arduino Mini Pro. Then go to Tools > Serial Port > Select COM port.
CP2102 Conecting Diagram
The CP2102 Connecting figure is shown below:

CP2102 Connecting Diagram
Arduino Pro Mini | CP2102 Module |
VCC | VCCIO |
GND | GND |
RXI | TXD |
TX0 | RXD |
DTR | DTR |
Specifications
- TypeParameter
- Factory Lead Time2 Weeks
- Published2016
- Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - TypeInterface
- Function
The parameter "Function" in electronic components refers to the specific role or purpose that the component serves within an electronic circuit. It defines how the component interacts with other elements, influences the flow of electrical signals, and contributes to the overall behavior of the system. Functions can include amplification, signal processing, switching, filtering, and energy storage, among others. Understanding the function of each component is essential for designing effective and efficient electronic systems.
USB 2.0 to UART (RS232) Bridge - Utilized IC / Part
Utilized IC / Part is a parameter that refers to the extent to which an integrated circuit (IC) or electronic component is being used or consumed within a system or application. It typically indicates the percentage or ratio of the component's capabilities that are being utilized in a given scenario. This parameter is important for assessing the efficiency and performance of the component, as well as for determining if the component is being underutilized or overburdened in a particular application. Monitoring and optimizing the utilization of ICs and electronic parts can help improve overall system reliability, efficiency, and cost-effectiveness.
CP2102N - Supplied Contents
Supplied Contents in electronic components refers to the items or materials that are included with the component when it is purchased. These contents can vary depending on the specific component and manufacturer, but typically include things like user manuals, installation guides, cables, connectors, and any additional accessories needed for the component to function properly. The supplied contents are important for ensuring that the user has everything they need to set up and use the electronic component correctly. It is recommended to carefully check the supplied contents upon receiving a new electronic component to make sure that nothing is missing and to familiarize oneself with the included materials for optimal use.
Board(s) - Evaluation Kit
An Evaluation Kit is a collection of hardware and software components designed to help engineers and developers assess and test the functionality of a particular electronic component or system. It typically includes a development board, sample code, utilities, and documentation to facilitate development and prototype testing. Evaluation Kits enable users to quickly prototype applications, evaluate performance characteristics, and determine compatibility with other systems. They are commonly used in the design and development phases of electronic projects to simplify the integration of complex components.
Yes - REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
No SVHC - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
Non-RoHS Compliant
CP2102 Manufacturer
Silicon Labs (NASDAQ: SLAB) is a leading provider of silicon, software and system solutions for the Internet of Things, Internet infrastructure, industrial control, consumer and automotive markets. Resolving the electronics industry's toughest problems, providing customers with significant advantages in performance, energy savings, connectivity, and design simplicity. Backed by world-class engineering teams with unsurpassed software and mixed-signal design expertise, Silicon Labs empowers developers with the tools and technologies they need to advance quickly and easily from initial idea to final product.
Datasheet PDF
- Datasheets :
Trend Analysis
What is CP2102?
The CP2102 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS-232 designs to USB using a minimum of components and PCB space. ... An evaluation kit for the CP2102 (Part Number: CP2102EK) is available.
What is a USB to UART bridge?
Silicon Labs USB to UART Bridges are high-performance controller interface ICs that offer a complete plug and play interface solution. ... The USB-to-UART bridges consist of user-programmable custom baud rates of up to 2Mbps and support all modem interface signals.
How do I use Arduino as UART?
Arduino has one or more UART pins depending on the board. For our project, we will use an Arduino Uno which has only one UART interface found on pin 0 (RX0) and pin 1 (TX0). The Arduino pins 0 and 1 are also used for communicating with the Arduino IDE via the USB.
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