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TUSB2551A: 如何成功连接电脑并传输数据

Part Number: TUSB2551A
Other Parts Discussed in Thread: TUSB2551

想问下TUSB2551A连接到电脑上提示:

        未知USB设备(设备描述符请求失败)  

具体是什么原因,管脚电压点过都符合我的设想

  

具体设定: