This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TUSB2046B使用咨询

问题描述:插上电脑没有任何反应

原理图是参照TI官方提供的参考设计图,2046-PlainSelfPower.pdf,最终电路图见附件

  • 看了下您的电路,需要确认两点:

    1,上行端口的DP是否通过1.5Kohm电阻上拉了?附件电路中没有加,如果没有的话,建议加上。

    2. 是否保证正确的上电时序?按照datasheet中描述的时序是否满足?可以示波器测量下:

    Generally, a reset with a pulse width between 100 μs and 1 ms is recommended after 3.3-V VCC reaches its 90%. Clock signal has to be active during the last 60 μs of the reset window.

  • 谢谢回复,确实在 DP0 加上了 1.5K 的上拉电阻就可以了。