CYUSB3014 unable to be detected by PC

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LiZh_4600321
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Level 1

hello,

I used CYUSB3014 in my design and referenced the design of a third-party development board. After connecting to the PC with a cable, the device manager of the PC cannot find the device, and the measured voltage and crystal clock output are normal, but compared with the development board, it is found that when the PC is not connected, the DP pin of the development board is high ( 3.3V), and the discipline on my board is about 0.6V. What could be the cause of this problem?

Attachment here is the schematic (the clock uses X2, Y2 is not soldered).

我在设计中使用了CYUSB3014,参考了第三方的开发板设计。用线缆连接到PC后,PC的设备管理器无法发现设备,测量电压和晶振时钟输出都正常,但与开发板对比发现,在未连接PC时,开发板的DP管脚为高电平(3.3V),而我的板子上该管教是0.6V左右,产生该问题的原因可能是什么?

附件是我设计的原理图(时钟采用了X2,Y2未焊接)。

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YiZ_31
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pastedImage_0.png

你这里电容电感的顺序设计反了。

非常感谢,检查了几遍一直没注意到这个地方,还想请问一下有什么补救方法,以及为什么这个去耦电容影响这么大

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YiZ_31
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通常来说不会导致板子直接不能识别,建议你再检查是否有器件贴错的情况。你也可以比较DP到地的阻抗是否和我们的开发板有差异。

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我检查了一下,没有器件错贴的情况,也测量了dp管脚对地的阻抗,和开发板均对比是1兆欧左右,还可能是什么原因呢?

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