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主控linux系统与TUSB8020B概率性出现不能识别问题

Other Parts Discussed in Thread: TUSB8020B

你好!

        目前项目正在用TUSB8020B做扩展应用,测试发现主控偶尔不能识别TUSB8020B的现象,有时出现概率较高,有时出现概率很低,以下是电路设计原理图,请协助检查分析。

3.3V电源电路:

1.1V电源电路:

示波器测试信号:

1、上电时序:

      蓝色为3.3V,黄色为1.1V,3.3V早于1.1V上电。手册上说这2个电源并无严格的时序要求,请问是否有影响?

2、复位信号,目前看波形并无异常,复位时间大于3ms:

3、其他存在的问题:1.1V和3.3V电源为加磁珠,另外USB_VBUS电源输入未加滤波电容。