【产品】串口I/O独立供电的USB总线转接芯片CH343，支持CTS和RTS硬件自动流控

时间： 2022-05-19 来源：沁恒

技术问答

沁恒推出的CH343是一个USB总线转接芯片，实现USB转高速异步串口，同时支持115200bps及以下通讯波特率的自动识别和动态自适应，提供了常用的MODEM联络信号，用于为计算机扩展异步串口，或者将普通的串口设备或者MCU直接升级到USB总线。

特点

全速USB设备接口，兼容USB V2.0。

内置固件，仿真标准串口，用于升级原串口外围设备，或者通过USB增加额外串口。

计算机端Windows操作系统下的串口应用程序完全兼容，无需修改。

支持免安装的操作系统内置CDC类驱动程序或者多功能高速率的VCP厂商驱动程序。

硬件全双工串口，内置独立的收发缓冲区，支持通讯波特率50bps～6Mbps。

可选自动识别和动态自适应在115200bps及以下的常用通讯波特率。

串口支持5、6、7或者8个数据位，支持奇校验、偶校验、空白、标志以及无校验。

支持常用的MODEM联络信号RTS、DTR、DCD、RI、DSR、CTS。

支持CTS和RTS硬件自动流控。

支持半双工，提供正在发送状态TNOW支持RS485切换。

通过外加电平转换器件，支持RS232接口。

USB端支持5V电源电压和3.3V电源电压。

串口I/O独立供电，支持5V、3.3V、2.5V、1.8V电源电压。

内置上电复位，内置时钟，无需外部晶振。

CH343P内置EEPROM，可配置芯片VID、PID、最大电流值、厂商和产品信息字符串等参数。

芯片内置Unique ID(USB Serial Number)。

提供SOP16和ESSOP10及QFN16无铅封装，兼容RoHS。

封装

注：CH343K/CH343P的底板是0#引脚GND，是可选但建议的连接；其它GND是必要连接。
CH343的USB收发器按USB2.0全内置设计，UD+和UD-引脚不能串接电阻，否则影响信号质量。

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