【应用】内置软件固件的USB总线转串口芯片CH340G用于数据采集设备，可兼容USB2.0

时间： 2022-06-29 来源：世强

技术问答

数据采集设备需要通过无线或有线的方式将数据发送给上位机，无线可通过蓝牙传输，有线则通过USB直接跟上位机通信，对于不带USB的MCU，可以使用CH340G通过串口UART转换成USB。沁恒CH340G是一个USB总线转串口芯片，实现USB转串口或者USB转打印口，兼容USB2.0，内置软件固件，支持2.8~3.6V电源电压，使用简单。

一、CH340G的应用框图

上图是CH340G应用数据采集设备的框图，MCU提供一个串口UART接口给到CH340G，通过CH340G转换成USB直接跟上位计算机通信，也可以通过蓝牙无线通信。

二、CH340G的封装和引脚定义如下

CH340G芯片因为没有内置时钟发生器，所以正常工作时需要外部向XI和XO引脚之间连接一个12MHz的晶体用来提供时钟信号，并且分别为XI和XO引脚对地连接振荡电容。如果想节约成本不想额外连接晶体，可以选用CH340C/N/K/E/B系列。

三、CH340G的应用参考电路

上图是CH340G的应用参考设计图，从图中可以看出CH340G和MCU通过TTL串口直接连接，并且跟MCU统一供电，整个电路除了CH340G的时钟发生电路之外无其他额外电路，操作简单。

四、CH340G的优点：

1、供电电压范围宽，2.8V~3.6V；

2、全速USB设备接口，兼容USB2.0；

3、支持USB设备挂起以节约功耗；

4、内置了USB上拉电阻，所以UD+和UD-可以直接连接到USB总线上；

5、内置了独立的收发缓冲区，支持最高2000000波特率；

6、串口发送信号的波特率误差小于0.3%；

7、在Windows操作系统下，驱动程序能仿真标准串口，绝大部分原串口应用程序完全兼容。

综上所述，沁恒微CH340G在硬件上是标准SOP-16封装，兼容USB2.0，内置固件，波特率误差小等优点，操作简单，性价比高，是数据采集设备应用或者其他USB转串口应用场景的优秀选择。

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