CH340C is a USB bus conversion chip, it can realize USB to UART interface or USB to printer interface.
CH340C, CH340E, and CH340B have built-in crystal, no external crystal.
CH340C provides a common MODEM liaison signal, used to expand the UART interface of the computer or upgrade the common serial device to a USB bus directly.
Full-speed USB device interface, compatible with USB V2.0.
Hardware full duplex serial UART interface, built-in transmit-receive buffer, supports communication baud rate varies from 50bps to 2Mbps.
Supports common MODEM liaison signal RTS, DTR, DCD, RI, DSR, and CTS.
Emulate standard UART interface, used to upgrade the serial peripherals, or expand UART interface via USB bus.
Through external level conversion chip provide further RS232, RS485, RS422 interface, etc.
Original serial applications are compatible, without any modification in the Windows operation system.
Software compatible with CH341, use the driver of CH341 directly.
Support 5V and 3.3V power supply even 3V.
Supported Low Power Consumption Mode.
Pin Assignments:
Specifications:
Type: USB-to-Serial Transceiver IC
USB Standard: USB 2.0 Full-Speed (12 Mbps)
Serial Protocol: UART (Universal Asynchronous Receiver Transmitter)
Max UART Baud Rate: 2 Mbps
Package Type: SOP-16
Operating Voltage(VCC): 3.3V to 5.0V
Current Consumption: 8 mA at 5V
I/O Voltage Levels: 3.3V and 5.0V logic levels.
ESD Protection: Up to ±6 kV (HBM)
Data Rate:
USB: Full-Speed (12 Mbps)
UART: Up to 2 Mbps (Programmable baud rate from 50 bps to 2 Mbps)
Flow Control Signals: Hardware flow control (RTS/CTS, DTR/DSR).
MODEM Signal Support: RTS, DTR, DCD, RI, DSR, CTS.
USB Data Lines:
D+ (UD+): USB data positive
D- (UD-): USB data negative
UART Interface Pins: TXD, RXD, and additional MODEM control signals.
Driver Support: Compatible with CH341 driver for Windows, Linux, and macOS platforms.
Crystal Oscillator: Internal oscillator integrated, no external crystal required.
Operating Temperature Range: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C
Input Voltage: 0V to VCC
Output Current:
High Level: 4 mA
Low Level: 8 mA
Applications:
Upgrading serial peripherals to USB connectivity.
Expanding UART interfaces via USB in embedded systems.
Implementing USB-to-RS232, RS485, or RS422 conversions with external level-shifting components.
Developing USB-based communication interfaces in microcontroller projects.
Specifications:
Specifications: