Hi,all
My hardware platform is MX6DL, through the I2S connect SGTL5000, the problem is as long as the oscilloscope probe connect the I2S TXC line, the sound immediately have a lot of noise. If the oscilloscope probe disconnected from txc, and sometimes can return to normal, and sometimes can not return to normal. I also test that connect 0 ohm, 22 ohm, 50 ohm, 100 ohm between MX6DL 's TXC and SGTL5000' s TXC,all are no effect.
Please help , thanks!
Note: The oscilloscope probe is only connected to TXC pin,not connected to TXD pin. But TXC pin waveform is good, TXD pin waveform is not good.
我的硬件平台是MX6DL,通过I2S接的是SGTL5000,现在的问题是,只要用示波器探头接触到I2S的TXC线路,原本播放正常的声音,立刻有很大的噪音,如果把TXC上的示波器探头断开,有时候能回复正常,有时候不能回复正常,我也在MX6DL与SGTL5000之间I2S的TXC脚串接0欧姆,22欧姆,50欧姆,100欧姆,都试过了,都没有效果,请工程师给帮忙分析一下,谢谢!!
注:TXC脚的波形是不错的,反倒是没有接触示波器探头的TXD脚波形倒是出问题了
Hello Haohua,
一般来说,载板子上有无线通信模块时,产生高频干扰的可能性比较的。你可以试试,在I2S接口受干扰的线上,对地接一个15P-22PF的电容,看看是不是可以滤掉干扰。
Have a great day,
TIC weidong sun
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谢谢,weidong sun 的回复,我们曾经试过,在TXC接入30p到gnd,没有效果。
从波形看好像是TXD脚的高电平有时候被拉低一下,但是还没有被拉下来。