CH340G USB to Serial Converter Documentation

Component Name

CH340G USB to Serial Converter

Overview

The CH340G USB to Serial Converter is a popular and widely used component in the Internet of Things (IoT) and embedded systems. It is a compact, low-cost, and highly reliable device that enables communication between a computer's USB port and a serial device, such as a microcontroller, robot, or other serial-enabled device.

Functionality

The CH340G USB to Serial Converter is designed to convert USB signals to serial signals, allowing users to communicate with serial devices using a standard USB connection. The converter is based on the CH340G chip, which is a USB to serial bridge controller that implements the USB 2.0 protocol. The device acts as a virtual serial port, allowing the computer to communicate with the serial device as if it were connected directly to a serial port.

Key Features

USB 2.0 Compliance: The CH340G USB to Serial Converter is fully compliant with the USB 2.0 standard, supporting data transfer rates of up to 480 Mbps.
Serial Communication: The converter supports serial communication protocols such as RS-232, RS-485, and RS-422, with a maximum baud rate of 2 Mbps.
Auto-Baudrate Detection: The CH340G chip can automatically detect the baud rate of the connected serial device, eliminating the need for manual configuration.
Hot Swapping: The converter supports hot swapping, allowing users to connect and disconnect devices without shutting down the system.
Low Power Consumption: The CH340G USB to Serial Converter has a low power consumption of approximately 100 mA, making it suitable for battery-powered devices.
Compact Design: The converter is available in a compact, 18-pin SSOP package, making it ideal for use in space-constrained applications.
Operating System Support: The CH340G USB to Serial Converter is compatible with Windows, macOS, and Linux operating systems.
LED Indicators: The converter features LED indicators for power, data transmission, and data reception, providing visual feedback on the communication status.
ESD Protection: The device has built-in electrostatic discharge (ESD) protection, ensuring the converter is protected against static electricity damage.

Applications

Microcontroller Development: The converter is often used to communicate with microcontrollers, such as Arduino, Raspberry Pi, and ESP32, for development, testing, and debugging.
Industrial Automation: The CH340G is used in industrial automation applications, such as robotic control systems, data acquisition systems, and serial-enabled devices.
IoT Projects: The converter is commonly used in IoT projects, such as smart home automation, wearable devices, and environmental monitoring systems.
Serial-enabled Devices: The CH340G is used to connect serial-enabled devices, such as GPS modules, Wi-Fi modules, and Bluetooth modules, to a computer or other USB-enabled devices.

The CH340G USB to Serial Converter is widely used in various applications, including

Technical Specifications

Dimensions

18-pin SSOP package, 18mm x 12mm x 2.5mm

Conclusion

The CH340G USB to Serial Converter is a reliable and versatile component that enables easy communication between a computer and serial devices. Its compact design, low power consumption, and hot-swapping capabilities make it an ideal choice for a wide range of applications, from microcontroller development to industrial automation and IoT projects.

Pin Configuration

CH340G USB to Serial Converter Pinout Explanation
The CH340G USB to Serial Converter is a widely used module for converting USB signals to serial communication signals, allowing devices to communicate with microcontrollers, serial devices, and other peripherals. The module has a total of 12 pins, which are explained below:
Pin 1: VCC (Power Supply)
Description: Provides power to the CH340G module.
Voltage: Typically 5V, but can be operated at 3.3V or 5V depending on the application.
Connection: Connect to a 5V power source, such as a USB port or a voltage regulator.
Pin 2: GND (Ground)
Description: Ground pin for the module.
Connection: Connect to the ground of the power source and other devices in the circuit.
Pin 3: TXD (Transmit Data)
Description: Serial data transmit pin.
Connection: Connect to the receive pin (RX) of the microcontroller or serial device.
Pin 4: RXD (Receive Data)
Description: Serial data receive pin.
Connection: Connect to the transmit pin (TX) of the microcontroller or serial device.
Pin 5: DTR (Data Terminal Ready)
Description: Data terminal ready pin, used for flow control.
Connection: Connect to the DTR pin of the microcontroller or serial device, if available.
Pin 6: RTS (Request to Send)
Description: Request to send pin, used for flow control.
Connection: Connect to the RTS pin of the microcontroller or serial device, if available.
Pin 7: CTS (Clear to Send)
Description: Clear to send pin, used for flow control.
Connection: Connect to the CTS pin of the microcontroller or serial device, if available.
Pin 8: DCD (Data Carrier Detect)
Description: Data carrier detect pin, used to detect the presence of a carrier signal.
Connection: Connect to the DCD pin of the microcontroller or serial device, if available.
Pin 9: RI (Ring Indicator)
Description: Ring indicator pin, used to detect the presence of an incoming call.
Connection: Connect to the RI pin of the microcontroller or serial device, if available.
Pin 10: NC (Not Connected)
Description: Not connected pin, reserved for future use.
Connection: Leave unconnected.
Pin 11: 3V3 (3.3V Power Output)
Description: 3.3V power output pin, can be used to power external devices.
Connection: Connect to the power input of an external device, if required.
Pin 12: USB_DP (USB Data Plus)
Description: USB data plus pin, used for USB communication.
Connection: Connect to the USB data plus pin of a USB connector.
Connection Structure:
To connect the pins of the CH340G module to a microcontroller or serial device, follow this structure:
VCC (Pin 1) -> 5V Power Source
GND (Pin 2) -> Ground
TXD (Pin 3) -> RX (Microcontroller/Serial Device)
RXD (Pin 4) -> TX (Microcontroller/Serial Device)
DTR (Pin 5) -> DTR (Microcontroller/Serial Device) (if available)
RTS (Pin 6) -> RTS (Microcontroller/Serial Device) (if available)
CTS (Pin 7) -> CTS (Microcontroller/Serial Device) (if available)
DCD (Pin 8) -> DCD (Microcontroller/Serial Device) (if available)
RI (Pin 9) -> RI (Microcontroller/Serial Device) (if available)
3V3 (Pin 11) -> Power Input (External Device) (if required)
USB_DP (Pin 12) -> USB Data Plus (USB Connector)
Note: The connections may vary depending on the specific microcontroller or serial device being used. Always refer to the datasheet of the device being connected to ensure correct pin connections.

Code Examples

CH340G USB to Serial Converter Documentation

Overview

The CH340G USB to Serial Converter is a widely used IoT component that enables communication between a USB port and a serial device, such as a microcontroller, Arduino board, or other serial peripherals. This converter is based on the CH340G chip, which provides a high-speed USB interface and a serial communication interface.

Pinout

The CH340G USB to Serial Converter typically has the following pinout:

| Pin | Function |
| --- | --- |
| VCC | Power supply (3.3V or 5V) |
| GND | Ground |
| RX | Receive data |
| TX | Transmit data |
| DTR | Data Terminal Ready (optional) |
| RTS | Request to Send (optional) |

Code Examples

### Example 1: Using CH340G with Arduino

In this example, we will demonstrate how to use the CH340G USB to Serial Converter to communicate between an Arduino board and a computer.

Hardware Connection:

Connect the CH340G VCC pin to the Arduino 5V pin
 Connect the CH340G GND pin to the Arduino GND pin
 Connect the CH340G RX pin to the Arduino TX pin (Digital Pin 1)
 Connect the CH340G TX pin to the Arduino RX pin (Digital Pin 0)

Software:

Open the Arduino IDE and create a new sketch
 Include the `Serial` library
 Initialize the serial communication at a baud rate of 9600
 Send a string "Hello, World!" to the serial port

```cpp
#include <Serial.h>

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("Hello, World!");
  delay(1000);
}
```

Computer Side:

Connect the CH340G to a computer using a USB cable
 Open a serial terminal software (e.g., PuTTY, Tera Term, or Serial Monitor in Arduino IDE)
 Set the baud rate to 9600
 You should see the string "Hello, World!" printed on the serial terminal

### Example 2: Using CH340G with Python on Raspberry Pi

In this example, we will demonstrate how to use the CH340G USB to Serial Converter to communicate between a Raspberry Pi and a serial device.

Hardware Connection:

Connect the CH340G VCC pin to the Raspberry Pi 3.3V pin
 Connect the CH340G GND pin to the Raspberry Pi GND pin
 Connect the CH340G RX pin to the Raspberry Pi TX pin (GPIO 14)
 Connect the CH340G TX pin to the Raspberry Pi RX pin (GPIO 15)

Software:

Install the `pyserial` library using pip: `pip install pyserial`
 Import the `serial` library
 Open the serial port at a baud rate of 9600
 Send a string "Hello, Raspberry Pi!" to the serial port

```python
import serial

# Open the serial port
ser = serial.Serial('/dev/ttyUSB0', 9600)

while True:
    # Send a string to the serial port
    ser.write(b"Hello, Raspberry Pi!
")
    # Wait for 1 second
    time.sleep(1)
```

Serial Device Side:

Connect the serial device to the CH340G
 Configure the serial device to operate at a baud rate of 9600
 You should see the string "Hello, Raspberry Pi!" printed on the serial device

Note: Make sure to replace `/dev/ttyUSB0` with the actual device file of the CH340G USB to Serial Converter on your system.

CH340G USB to Serial Converter

Component Name

Operating Temperature

Power Supply

Data Transfer Rate

Serial Baud Rate

Connectivity

Dimensions

Pin Configuration

Code Examples

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Saved Addresses

CH340G USB to Serial Converter

Component Name

Operating Temperature

Power Supply

Data Transfer Rate

Serial Baud Rate

Connectivity

Dimensions

Pin Configuration

Code Examples