CYUSB3014 boot issue

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LiZh_4600321
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hello,

        I used CYUSB3014 in my design, but  it fails to boot from USB. When debugging, I found that the voltage of the DP pin is not pulled up to 3.3V, but about 0.6V? The crystal oscillator does not vibrate when it is powered on, but it starts to vibrate after the chip reset. I used both VBUS and VBATT to power the USB module. The VBATT voltage is 5V. Is there any problem with this design?

        This question has troubled me for a long time, looking forward to any reply!

您好,

       我的设计中使用了CYUSB3014,但现在它无法从USB引导启动。调试时,发现DP管脚的电压没有拉高到3.3V,而是0.6V左右?晶振上电时不起振,但在芯片复位后起振,我同时使用了VBUS和VBATT给USB模块供电,VBATT电压为5V,这样设计有没有问题?

        这个问题困扰了我很久,期待任何回复!

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1 Solution

Hi,

U16是一个静电保护器件,接在它两端的是USB3.0高速信号线。

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YiZ_31
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你的晶振规格可以发一下吗

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您好,

        晶振我使用的是19.2MHz,我尝试了使用26Mhz的有源晶振来排除时钟的影响,DP管脚的电压还是这样。下图是我使用的无源晶振的手册。调试时我还尝试了将开发板上的晶振换到我的板子上,结果一样,很困惑。启动模式的配置电阻和时钟的配置电阻我都检查了很多次,都是符合芯片手册的说明的,这种情况下我还应该考虑哪些方面的原因呢?

        谢谢!

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YiZ_31
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Hi,

我又看了一遍你的原理图,你能否解释下U16是个什么器件,为什么同样的SS_DP SS_DP信号会接到两个USB口?

Regards,
Eddie

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Hi,

U16是一个静电保护器件,接在它两端的是USB3.0高速信号线。

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YiZ_31
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从USB信号的角度来说,是不允许这样同时连接至两个USB口的设计的,USB信号需要在长度和阻抗上保持匹配。你也可以从这方面找找原因。

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