【应用】沁恒高速USB转接芯片CH347T用于测试板，单一3.3V供电，采用TSSOP-20无铅封装

时间： 2023-02-23 来源：世强

技术问答

在很多产品应用中，我们需要将单片机的数据传输到PC端进行数据处理分析，通常情况下最常用的就是串口了，但熟悉硬件开发的都知道串口有个最大的问题就是传输速度不高，这时就需要采用总线转换了。高速USB转换芯片 CH347T就能解决这个问题，480Mbps高速USB设备接口，且提供多种总线转换模式，异步串口、同步串口和JTAG接口，可操纵不同器件设备。

测试板需要跟外部PC机进行通讯，需要用到不同的接口和串口设置，某客户测试板产品需要将SPI接口和UART串口数据传输到外机，需要先转换为USB接口，本文介绍了客户采用沁恒的CH347T高速USB总线转换芯片应用于测试板接口转换。CH347是一款高速USB总线转接芯片，通过USB总线提供异步串口、I²C同步串行接口、SPI同步串行接口和JTAG接口等。

沁恒CH347参数及优势：

>480Mbps高速USB设备接口，外围元器件只需晶振和电容。

>内置EEPROM，可配置工作模式、芯片VID、PID、最大电流值、厂商和产品信息字符串等参数。

>单一3.3V供电。

>提供TSSOP-20无铅封装，兼容RoHS。

>多种工作模式，适应高速USB转接应用需求。

>可根据行业批量需求进行功能性定制。

注意，CH347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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