用MEMS振荡器替换16MHz水晶

嗨，谢谢你的回应。我们已经使用了PCB安装屏蔽，但环境足够苛刻，这是不够的。我可以上传PCB的图像，在那里您可以看到屏蔽和常规布局的寄存器如果如果有帮助，那么如果有帮助。

你好，

Here is a PDF of the layout. The device is powered by a small 3.6V rechargable battery for measuring a thermocouple in a high voltage environment with extreme EMI.

你好，

I have tested boards with both ground designs as I have encountered advice both for and against the grounding ring. We did not notice a difference in performance in the harsh environment between the two.

Do you have suggestions of what to do with unused GPIO and LFxtal pins?

Thanks,

Ansel.

1. I do not know for certain that the oscillator is causing issues. The code running on the 14585 is based off the DSPS example and periodically samples an ADC (via the easy_timer) and notifies a receiver with the value, it has been well tested on this project and others and has never encountered issues. (answered further in 5.)

2。这个水晶。16MHz, 18pF, 80ohm, 30ppm。Has been used on other 14585 designs without issue (standard industrial environment)

3.屏蔽不会将迹线覆盖到天线？我不认为这是必要的，因为它是被地面平面敏感的。

4. This desgn is used for laboratory testing with close proximity of transmitter and receiver and does not require exceptional performance to warrant the cost of impedance control or measurement.

该委员会在非EMI环境中工作，并具有中度EMI。连接到P0_0的放大器测量具有快速变化的共模电压的差分热电偶信号。当CMV在0到10kV之间发生变化时，14585的函数按预期函数，可连接并输出正确的数据。如果CMV更改〜10kV，则14585将停止广告，广告但不发送任何通知，或广告，但是直接从接收器断开重新连接 - 在EMI清除直到EMI。CMV迅速增加并减少，每微秒速率的多kV速率，并且发生在大约15Hz。

我不知道精确的频率或力量。我相信在子GHz范围内很好，但我们没有设备测量它。

This is the most recent layout. As this is not a design for series production, we are able to relatively quickly make changes and test new layouts.

Thanks!

Ansel.

好的，哇，我完全忽略了，而Digikey的抵抗价值不正确也没有帮助。这个水晶appears to be more suitable。I will look at changing it when we next revise the boards.

当14585在以前的设计中，我没有尝试修剪水晶。

Thanks!

你好，

除非我错了，否则数据表表示部件号ECS-160-10.-36q-aes-tr表示电容应该10 pfthis version. Otherwise the resistance, shunt capacitance, and tolerance are all within the reccomended range?

Thanks!