CP2102 Bridge Driver: Alternative, Pinout and Datasheet
3V~3.6V USB 2.0 UART Controllers Interface ICs CP2102 28 Pins Bridge, USB to UART 28-VFQFN Exposed Pad









3V~3.6V USB 2.0 UART Controllers Interface ICs CP2102 28 Pins Bridge, USB to UART 28-VFQFN Exposed Pad
CP2102 is a highly integrated USB to UART bridge driver. This article mainly introduce its alternatives, pinout, datasheet and other detailed information about Silicon Labs CP2102.

Arduino Mini Pro + CP2102 USB to TTL - Tutorial
CP2102 Description
The CP2102 is a highly integrated USB to UART bridge controller, which provides a simple solution for updating RS-232 Design to USB uses the least components and PCB space. CP2102 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM or EPROM, and asynchronous serial data bus(UART) has complete modem control signals in a compact 5 x 5 mm QFN-28 package. Other external USB Components are not required.
CP2102 Pinout

Pin Description

CP2102 CAD Model
Symbol

Footprint

3D Model

CP2102 Features
•The stable and reliable chipset CP2102.
•USB specification 2.0 is compatible with full speed 12Mbps.
•Standard USB Type A male header and TTL 6-pin connector.
•Exchange information and modem interface signals throughout the process
•Baud rate: 300 bps to 1 Mbps.
•Byte receiving buffer; 640 byte transmission buffer.
•Support hardware or X-On/X-Off exchange process.
•Work with existing COM port PC applications
Specifications
- TypeParameter
- Factory Lead Time6 Weeks
- Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Tin - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
28-VFQFN Exposed Pad - Number of Pins28
- Supplier Device Package
The parameter "Supplier Device Package" in electronic components refers to the physical packaging or housing of the component as provided by the supplier. It specifies the form factor, dimensions, and layout of the component, which are crucial for compatibility and integration into electronic circuits and systems. The supplier device package information typically includes details such as the package type (e.g., DIP, SOP, QFN), number of pins, pitch, and overall size, allowing engineers and designers to select the appropriate component for their specific application requirements. Understanding the supplier device package is essential for proper component selection, placement, and soldering during the manufacturing process to ensure optimal performance and reliability of the electronic system.
28-QFN (5x5) - Weight67.75536mg
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
-40°C~85°C - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tube - Published1997
- Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Not For New Designs - 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) - Max Operating Temperature
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
85°C - Min Operating Temperature
The "Min Operating Temperature" parameter in electronic components refers to the lowest temperature at which the component is designed to operate effectively and reliably. This parameter is crucial for ensuring the proper functioning and longevity of the component, as operating below this temperature may lead to performance issues or even damage. Manufacturers specify the minimum operating temperature to provide guidance to users on the environmental conditions in which the component can safely operate. It is important to adhere to this parameter to prevent malfunctions and ensure the overall reliability of the electronic system.
-40°C - Voltage - Supply
Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.
3V~3.6V - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
CP2102 - 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.
Bridge, USB to UART - Operating Supply Voltage
The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related.
3.3V - Number of Channels1
- Interface
In electronic components, the term "Interface" refers to the point at which two different systems, devices, or components connect and interact with each other. It can involve physical connections such as ports, connectors, or cables, as well as communication protocols and standards that facilitate the exchange of data or signals between the connected entities. The interface serves as a bridge that enables seamless communication and interoperability between different parts of a system or between different systems altogether. Designing a reliable and efficient interface is crucial in ensuring proper functionality and performance of electronic components and systems.
UART - Max Supply Voltage
In general, the absolute maximum common-mode voltage is VEE-0.3V and VCC+0.3V, but for products without a protection element at the VCC side, voltages up to the absolute maximum rated supply voltage (i.e. VEE+36V) can be supplied, regardless of supply voltage.
3.6V - Min Supply Voltage
The minimum supply voltage (V min ) is explored for sequential logic circuits by statistically simulating the impact of within-die process variations and gate-dielectric soft breakdown on data retention and hold time.
3V - Operating Supply Current
Operating Supply Current, also known as supply current or quiescent current, is a crucial parameter in electronic components that indicates the amount of current required for the device to operate under normal conditions. It represents the current drawn by the component from the power supply while it is functioning. This parameter is important for determining the power consumption of the component and is typically specified in datasheets to help designers calculate the overall power requirements of their circuits. Understanding the operating supply current is essential for ensuring proper functionality and efficiency of electronic systems.
20mA - Number of Ports
A port is identified for each transport protocol and address combination by a 16-bit unsigned number,.
1 - Nominal Supply Current
Nominal current is the same as the rated current. It is the current drawn by the motor while delivering rated mechanical output at its shaft.
26mA - Current - Supply
Current - Supply is a parameter in electronic components that refers to the maximum amount of electrical current that the component can provide to the circuit it is connected to. It is typically measured in units of amperes (A) and is crucial for determining the power handling capability of the component. Understanding the current supply rating is important for ensuring that the component can safely deliver the required current without overheating or failing. It is essential to consider this parameter when designing circuits to prevent damage to the component and ensure proper functionality of the overall system.
20mA - Data Rate
Data Rate is defined as the amount of data transmitted during a specified time period over a network. It is the speed at which data is transferred from one device to another or between a peripheral device and the computer. It is generally measured in Mega bits per second(Mbps) or Mega bytes per second(MBps).
1 Mbps - Protocol
In electronic components, the parameter "Protocol" refers to a set of rules and standards that govern the communication between devices. It defines the format, timing, sequencing, and error checking methods for data exchange between different components or systems. Protocols ensure that devices can understand and interpret data correctly, enabling them to communicate effectively with each other. Common examples of protocols in electronics include USB, Ethernet, SPI, I2C, and Bluetooth, each with its own specifications for data transmission. Understanding and adhering to protocols is essential for ensuring compatibility and reliable communication between electronic devices.
USB - Number of Transceivers1
- USB
USB stands for Universal Serial Bus, which is a common interface used for connecting various electronic devices to a computer or other host device. It allows for the transfer of data, power, and communication between devices. USB ports are found on a wide range of devices such as computers, smartphones, printers, cameras, and more. The USB standard has evolved over the years to include different versions with varying data transfer speeds and power delivery capabilities. Overall, USB has become a widely adopted and versatile standard for connecting and interacting with electronic components.
USB 2.0 - Standards
The parameter "Standards" in electronic components refers to established criteria or specifications that ensure interoperability, safety, and performance across various electronic devices and systems. These standards are often set by recognized organizations and describe the characteristics, dimensions, and testing methods for components. Adherence to these standards helps manufacturers produce compatible and reliable products, facilitates communication between devices, and ensures compliance with regulatory requirements. Standards play a crucial role in the consistency and quality of electronic components in the industry.
USB 2.0 - Height880μm
- Length5mm
- Width5mm
- 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.
Unknown - Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
CP2102 Example System Diagram

CP2102 Typical Connection Diagram

CP2102 Alternative

CP2102 Applications
1. Debugging purposes in development
2. Microcontroller and PC communication
3. Programming related uses
CP2102 Package

Package Drawing

Package Dimensions
CP2102 Manufacturer
Silicon Laboratories, Inc. (Silicon Labs) is a fabless global technology company that designs and manufactures semiconductors, other silicon devices and software, and sells them to Internet of Things (IoT) infrastructure, industrial automation, consumer and electronic products Electronic design engineers and manufacturers in the field. The global automotive market.
Its headquarter is located in Austin, Texas, USA. The company focuses on microcontrollers (MCU), wireless system-on-chips (SoC), timing devices, digital isolation devices, sensors, and broadcast equipment. The company also produces software stacks, including firmware libraries and protocol-based software, and a free software development platform called Simplicity Studio.
Trend Analysis
Datasheet PDF
- Datasheets :
1.What is CP2102?
SiLabs' CP2102 chip is a single-chip USB to UART bridge IC. It requires minimal external components. CP2102 can be used to migrate traditional serial port-based devices to USB. Hobbyists can use it as a powerful tool for making various PC interface projects.
2.Do I need external pull-up resistors for UART lines in CP2102?
TXD is described as "asynchronous data output". It can be push-pull (no pull-ups required) or open drain (pull-ups required). But RST is described as "open drain". This means that any output not explicitly described will be push-pull. Therefore, no pull-up is required on TXD. On the other hand, RXD is an input. Whether it needs to be pulled up does not depend on the CP2102, but on what it is connected to. In a typical application, CP2102 TXD and RXD lines will be connected to RS232 transceivers, such as MAX232. MAX232 uses push-pull output, no pull-up is required.
3.How do I solve CP2102 detection problem in windows 8.1?
Try to connect CP2102 to a laptop or PC without an esp module. It should list the device on the device manager. If this does not solve the problem, please try to connect the CP2102 to the USB port on the laptop (this solution is only available for laptops)
4.What is a CP2102 driver?
CP2102 is Silicon Labs' USB to UART IC. UART stands for Universal Asynchronous Receiver/Transmitter. It is not a communication protocol like SPI and I2C, but a physical circuit in a microcontroller, or an independent IC. The main purpose of UART is to send and receive serial data. One of the best things about UART is that it only uses two wires to transfer data between devices.
5.What is the difference between CP2102 and CP2101?
The main reason is that the size of the internal EEPROM is different, CP2101 is 512 bytes, and the latter is 102 bytes. EEPROM is used to store product manufacturer ID, product ID, serial number, power supply parameter version number and product description. Programming via USB is of little significance to ordinary users.
6.What is the difference between CP2102 and MAX232?
CP2102 is USB to RS232 MAX232 is the standard RS232 level and TTL level conversion
7.What are the characteristics of CP2102?
(1). Built-in USB transceiver, no external circuit device is needed (2). Contains a clock circuit, no external circuit device is required (3). Built-in power-on reset circuit (4). On-chip voltage regulation can output 3.3V voltage (5). Meet the requirements of USB2.0 specification (6). The SUSPEND pin supports USB status suspend (7). Asynchronous serial data bus is compatible with all handshake and modulator interface signals (8). The supported data format is data bit 8, stop bit 1, 2 and check bit (9). Connotation of 512-byte receive buffer and 512-byte transmit buffer (10).Support hardware or X-ON/X-OFF handshake
8.Can USB program the MCU through CP2102?
No, CP2102 does not have an external crystal oscillator, and the frequency does not meet the requirements of the microcontroller, so it cannot.
9.How can one computer use multiple CP2102 devices?
Just change the vid and pid names in the eeprom in the chip to different names. If there are two CP2102, just change one of them. Just let the PC distinguish the difference between the two. The vid and pid in the driver also need to be modified accordingly.
10.Which pin of the microcontroller is connected to the DTR of the CP2102?
You can see how many wires are used for the serial control of the single-chip microcomputer, 4 wires DTR connects to the DSR of the single-chip microcomputer, and 2 wires DTR connects to the CTS of the single-chip microcomputer
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