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我正在开发一个PIC32毫米微控制器的应用程序。在MCU,我在RB11启用了外部中断,在RA4管脚启用了Change On Notification中断(因为RA4管脚没有外部中断)。我们发现,有时RA4引脚会锁定到高电平或低电平,并且永远不会再次触发中断,除非我们关掉电源并再次打开电源。外部中断引脚不存在这个问题。当我们进行中级EFT测试(1kV)时,我们也可以模拟这个问题。然后我在这个引脚上添加了一个T.V.S,当我们再次进行EFT测试(测试多次)时,问题就消失了。我们感到惊讶的是,我们认为微芯片具有良好的EMC性能。我想问的是,通知模块的变化是否更加脆弱?需要采取什么预防措施?
以上来自于百度翻译 以下为原文 I am developing an application with the PIC32MM MCU. At the MCU I have both enabled the external interrupt at RB11 and Change On Notification interrupt at RA4 pin (because the RA4 pin does not have external interrupt). We found that sometimes the RA4 pin will lock to high or low level and never trigger the interrupt again, except we switch off the power and switch on the power again. The external interrupt pin does not have this problem. Also we can simulate this issue when we do a mid-level EFT test (1kV). Then I added a T.V.S at this pin, and the issue gone when we do the EFT again (tested several times). We are surprised as we thought Microchip is good at EMC performance. I want to ask is the Change On Notification module is more fragile? What precaution need to take? |
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4个回答
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你希望芯片能处理1KV不受保护吗?数据表怎么说?没有CPU会自行处理这个问题,设计者(你)必须保护它。
以上来自于百度翻译 以下为原文 You expect the Chip to handle 1KV unprotected? What does the Datasheet say? No CPU will take that on its own the designer (you) Must protect it. |
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是的,我预料到了。1kV EFT实际上不高(工业级生产线2kV)。大多数MCU具有可承受1kV EFT测试的内部保护。请注意,它是EFT,而不是正常的1K电压。我们已经做了很多类似的应用。用一个简单的EMC滤波器,在低1kVEFT测试中不会有问题。事实上,我们已经有X2和Y2电容器作为EMC滤波器。必须提到的是,我们在同一个应用程序中使用了另一个品牌MCU,没有问题。(PIC32MM MCU是替代方案,我们计划替换它)。而且,正如前面提到的,外部中断引脚和所有其他引脚都没有问题,只有“通知更改”引脚有这个问题,这就是为什么我想知道“通知更改”是否更脆弱,需要采取特殊的预处理小心。
以上来自于百度翻译 以下为原文 Yes I expected that. 1kV EFT is actually not high (Industrial grade product requires 2kV). Most MCU has internal protection which can withstand 1kV EFT test. Please be noticed that it is EFT, not a normal 1k voltage. We have made a lot of similar application. With a simple EMC filter, it should not have problem on a low 1kV EFT test. In fact, we have X2 and Y2 capacitors as the EMC filter already. I have to mention that we have used another brand MCU on the same application without problem. (The PIC32MM MCU is the alternative we planned to replace it). Also, as mentioned the external interrupt pin and all other pins do not have problem, only the "change-on-notification" pin has this problem, that is why I wonder if the "change-on-notification" is more fragile and need to take special precaution. |
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我们还有金属氧化物压敏电阻器。此外,我必须说明1kVEFT并不直接应用于单片机,而是应用于主电源。
以上来自于百度翻译 以下为原文 And we have Metal-oxide varistor as well. Besides, I have to clarify that the 1kV EFT is not apply to the MCU directly, it is applied to the main power supply. |
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数据表怎么说?通知的更改覆盖了大部分端口。你觉得哪一个别针特别?你肯定不是你的PCB不是一个额外的苛刻的一个引脚。PICS对来自负电压的闭锁非常敏感。你没有列出你的零件号,所以我看不到你的芯片。或者是别针。其他人也不能。我不为Microchip工作,这是我的期望。和你的不同。如果不在数据表中,您需要输入支持票才能找到答案。
以上来自于百度翻译 以下为原文 What does the data sheet say? Change on notification covers most of the ports. Which pin do you feel is special? And you are sure it is not you pcb that is not being extra harsh on the one pin. PICs are very sensitive to latchup from negative voltages. You did not list your part number so I can't look you chip. Or the pin. Nor can any one else. I do not work for microchip these are my expectations. Which are different from yours. If it is not in the data sheet you would need to enter a support ticket to find the answer. |
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