The "CH340N" is a USB-to-serial converter chip that is commonly used for communication between microcontrollers and USB-enabled devices. It is a part of the CH340 series produced by WCH (Winchiphead), a Chinese company specializing in integrated circuits for USB solutions.
Package Type:
The CH340N comes in SOP-16 (Small Outline Package) and SSOP-20 (Shrink Small Outline Package) variants. The pin count can vary depending on the specific package used.
Pin Function and Specifications
Below is the pin function table for the CH340N in the SOP-16 package (16 pins). The pin-out will be different for larger packages like SSOP-20, so it’s important to match the pin count with the exact part number.
Pin Number Pin Name Pin Function Description 1 VCC Power supply (5V or 3.3V depending on the configuration of the CH340N). 2 TXD Transmit data (serial output to a connected device). 3 RXD Receive data (serial input from a connected device). 4 GND Ground pin. 5 DTR Data Terminal Ready. Used for flow control in serial communication. 6 RTS Request to Send. Used for flow control in serial communication. 7 VCC Power supply pin (duplicate). 8 NC No connection. 9 VBUS USB bus voltage (connected to the USB VBUS pin). 10 USB- USB negative signal. 11 USB+ USB positive signal. 12 VCC Power supply pin (duplicate). 13 SUSPEND Suspend state pin (used for USB power management). 14 RESET Reset pin (used to reset the device). 15 GND Ground pin (duplicate). 16 VCC Power supply (5V or 3.3V, duplicate).FAQ: 20 Common Questions about CH340N
What is the CH340N? The CH340N is a USB-to-serial converter chip manufactured by WCH, commonly used for communication between USB devices and microcontrollers. How does the CH340N work? The CH340N converts USB signals to UART ( Universal Asynchronous Receiver Transmitter ) signals, enabling devices with UART interface s to communicate over USB. What is the maximum voltage that can be supplied to VCC pin of CH340N? The CH340N can operate with a VCC of 5V or 3.3V depending on the specific version. How many pins does the CH340N have in the SOP-16 package? The CH340N in the SOP-16 package has 16 pins. Can the CH340N be used with both Windows and Linux? Yes, the CH340N is compatible with both Windows and Linux operating systems with the correct drivers installed. What are the flow control pins available in CH340N? The CH340N includes DTR (Data Terminal Ready) and RTS (Request to Send) for hardware flow control. What is the function of the RESET pin on the CH340N? The RESET pin is used to reset the device, which is crucial for restarting operations after initialization. Can I connect the USB+ and USB- pins directly to the microcontroller? No, the USB+ and USB- pins on the CH340N should be connected to the USB port for communication. Is the CH340N compatible with 3.3V systems? Yes, the CH340N can operate with a 3.3V supply, but ensure that the logic levels on the RXD and TXD pins are appropriately matched with the microcontroller.How can I use the CH340N for serial communication?
The TXD and RXD pins of the CH340N should be connected to the RX and TX pins of the microcontroller for serial communication.What is the purpose of the SUSPEND pin?
The SUSPEND pin is used for power management, indicating when the device is in a suspended USB state to reduce power consumption.Does the CH340N support USB 3.0?
The CH340N supports USB 2.0. It does not support the higher data rates of USB 3.0.What is the operating temperature range for the CH340N?
The typical operating temperature range for the CH340N is between -40°C and +85°C.Can I use the CH340N without any external components?
The CH340N typically requires external components such as a capacitor on the VBUS and a crystal oscillator for clock generation.Is the CH340N available in other packages apart from SOP-16?
Yes, the CH340N is also available in packages like SSOP-20.Can the CH340N be used in Arduino projects?
Yes, the CH340N is commonly used in Arduino clones for USB-to-serial communication.What are the advantages of using CH340N?
Low cost, reliable performance, and support for multiple operating systems make the CH340N a popular choice for USB-to-serial communication.How can I troubleshoot issues with the CH340N?
Ensure the correct driver is installed, check USB connection integrity, and confirm the voltage levels on the pins.What is the maximum baud rate supported by the CH340N?
The maximum baud rate supported by the CH340N is up to 2 Mbps.Can the CH340N be used for other communication protocols apart from UART?
The CH340N is specifically designed for UART communication; it does not support other protocols like SPI or I2C directly.The above description and FAQ provide a detailed overview of the CH340N's functionality and common inquiries regarding its usage.
