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WCH CH340C product image
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WCH CH340CRoHS

Manufacturer
WCHAsian Brands
MPN
CH340C
LCSC Part #
C84681
Packaging
SOP-16
Customer #
Key Attributes
USB to Serial Port chip
Datasheetpdf iconWCH CH340C
In-Stock: 39,991
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QtyUnit PriceTotal Amount
1+$ 0.5857$ 0.59
10+$ 0.4979$ 4.98
50+$ 0.4344$ 21.72
100+$ 0.3824$ 38.24
500+$ 0.3661$ 183.05
1,000+$ 0.358$ 358.00
Standard Packaging50/Full Tube
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Interface/Interface Controllers
ManufacturerWCH
PackagingSOP-16
Operating Temperature-20℃~+70℃
Voltage - Supply3.3V;5V
Number of ports-
Applications FunctionTransceiver
Data Rate2Mbps
USB ProtocolUSB 2.0
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Introduction

AI Translation

CH340 is a USB bus adapter chip, can realize USB to serial port or USB to print port. In serial port mode, CH340 provides commonly used MODEM contact signals, which are used to expand asynchronous serial ports for computers, or directly upgrade ordinary serial port devices to the USB bus.

Features

AI Translation
  • Full-speed USB device interface, compatible with USB V2.0.
  • Simulation of standard serial ports, used to upgrade original serial port peripherals, or add additional serial ports through USB.
  • The serial port application program under the Windows operating system on the computer side is fully compatible, no need to be modified.
  • Hardware full-duplex serial port, built-in transceiver buffer, supports communication baud rate of 50bps~2Mbps.
  • Support commonly used MODEM contact signals RTS, DTR, DCD, RI, DSR, CTS
  • Provide RS232, RS485, RS422 interfaces by adding level conversion devices.
  • CH340R supports IrDA specification SIR infrared communication, and baud rate from 2400bps to 115200bps.
  • Built-in firmware, and software compatible with CH341, you can use the VCP driver of CH341 directly.
  • Support 5V and 3.3V supply voltage.
  • CH340C/N/K/E/X/B has a built-in clock, requires no external crystal. CH340B also has a built-in EEPROM for configuring the serial number.
  • SOP-16, SOP-8 and SSOP-20, ESSOP-10, MSOP-10 lead-free packages are available, RoHS compatible.

Product FAQ

  • 1. What are the key features and operating specifications of the WCH CH340C USB-to-UART converter?
    The WCH CH340C is a USB 2.0 Full-Speed USB-to-UART bridge IC that converts USB communication into standard asynchronous serial (UART) signals. The CH340C features an integrated clock generator, eliminating the need for an external 12MHz crystal and associated capacitors. It supports UART communication rates from 50bps up to 2Mbps and operates with either a 3.3V or 5V supply, depending on the circuit configuration. The device is available in compact surface-mount packages and can also support RS232, RS485, and RS422 interfaces when used with appropriate external level-conversion circuitry.
  • 2. Can the CH340C communicate with microcontrollers?
    Yes. The CH340C is designed to interface with devices that provide a standard UART interface. It converts USB communication from a host computer into UART transmit (TXD) and receive (RXD) signals, enabling programming, debugging, and serial data communication. The datasheet includes reference circuits for connecting the CH340C to MCU serial ports for USB-to-UART communication.
  • 3. Why would a designer choose the CH340C instead of another USB-to-UART bridge IC?
    The CH340C integrates a USB-to-UART interface with a built-in clock generator, eliminating the need for an external 12MHz crystal and associated capacitors. This reduces external component count and simplifies circuit design. The device supports USB 2.0 Full-Speed communication and UART data rates up to 2Mbps, making it suitable for a wide range of USB-to-serial applications.
  • 4. Which PCB layout practices help ensure reliable USB communication with the CH340C?
    For reliable USB operation, decoupling capacitors should be placed as close as possible to the CH340C power pins. The USB D+ and D− signal lines should be routed closely together, and ground wiring or copper should be provided alongside the USB data lines where practical to help reduce external interference. Following these PCB layout recommendations helps support reliable USB communication.
  • 5. How does the integrated clock generator benefit CH340C designs?
    The CH340C includes an integrated clock generator, eliminating the need for an external 12MHz crystal and associated capacitors. This reduces the number of external components required in the design and simplifies the clock circuitry while maintaining USB Full-Speed operation.