PIC18LF4520任何ESD/EMI是否会损坏闪存或ERAM存储器

大家好，我设计了一个救援电路，它将产生复位脉冲（50毫秒脉冲接地脉冲），如果控制器停止工作超过3秒。我使用PIC18LF45 20，它的MCLR引脚被绑定到VDD的电阻，救援电路的输出通过电阻连接到MCLR引脚。GrimWord正确设置MCLR重置，我用软件模拟检查了它，它正在工作。但是几天后，现场控制器中的连续工作被挂起了一些（可能是EMI／ESD）和救援电路开始产生复位脉冲，但是控制器没有被复位，好像MCLR配置改变为RE3输入。我还没有去掉电源来理解这个问题，可能是如果我去掉电源并重新连接它可能会开始。我希望我能解释这个问题。如果有任何人知道MCLR问题，请告诉我，谢谢。



      以下为原文

    Hello all,
I have designed a rescue circuit which will generate reset pulse (50 ms pulse ground pulse) if controller is stop working for more than 3 sec.I am using PIC18LF4520, Its MCLR pin is tied to VDD with resistance and  rescue circuit's output is connected to MCLR pin through a resistance.Configuration word properly set for MCLR reset and I checked this using software simulation and it was working. But after few days continuous working in the field controller got hanged some how (may be EMI/ESD) and rescue circuit started generating reset pulses but controller is not getting reset as if MCLR configuration is changed to  RE3 Input. I have not removed the power supply yet to understand the problem, may be if I remove power and reconnect it may start. I hope i could explain the problem. If any body knows MCLR issue, pl let me know.
Thanks in advance

如果你正在闩锁，重置脉冲不会清除它。最有可能的原因是GPIO引脚被拉到地面或VDD之上。你的信号可能有些过冲。



      以下为原文

    If you're getting latch-up, a reset pulse won't clear it.
The most likely cause of that would be GPIO pins being pulled below ground or above Vdd.
You may have some overshoot on some of your signals.
 
 

谢谢您的宝贵答复。有可能因为EMI／ESD而有过冲吗？我已经把ESD二极管从NXP输出。MCLR有可能被锁存吗？有什么解决办法吗？再次感谢您的回复



      以下为原文

    Thanks for your valuable reply.Is it possible to have overshoot because of EMI/ESD? I have put ESD diode at output from NXP. Is it possible that MCLR gets latched up? ANy solution for this?
Thanks again for reply

我不知道你的问题是什么，没有更好的描述你的板。你能发布它的示意图吗？特别是，我们需要看到任何PIC引脚连接到任何“板外”信号，以及哪些组件在PIC和“外部世界”之间。它不是MCR PIN T。如果你把坏的电压放进去，它会把整个PIC芯片锁起来。



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    I hjave no idea what your problem could be without a better description of your board.
Can you post a schematic of it.
In particular, we need to see any PIC pins that are connected to any "off board" signals, and what components you have between the PIC and the "outside world".
 
It's not the MCLR pin that latches up, it the whole PIC chip if you put bad voltages into it.
 
 

谢谢你的帮助，可惜我不能把示意图放进去，但我会尽力解释的。它是一种医疗监护装置。电路被封装在一个带有电池（3伏电源）的金属外壳中。它有3行从它，这些不是直接连接到控制器，而是一个ASIC。控制器将驱动ASIC。您认为EMI／ESD会影响电压电平吗？我希望你能提出一些看法。再次感谢。



      以下为原文

    Thanks for your help,
Unfortunately schematic I can not put, but I will try to explain it. Its a medical monitoring device. Circuit is enclosed in a metallic case with battery (3 V supply) . It is having 3 lines out of it and these are not directly connected to controller but to an ASIC. Controller will drive an ASIC. 
Do you think EMI/ESD can affect the voltage levels? I hope you can put some of your views on it.
Thanks again

您好，如果有人可以把我的观点放在我最后一篇关于PIC控制器闩锁的描述的基础上……谢谢你们的帮助，可惜的是，我不能放，但我会解释一下。它是一种医疗监护装置。电路被封装在一个带有电池（3伏电源）的金属外壳中。它有3行从它，这些不是直接连接到控制器，而是一个ASIC。控制器将驱动ASIC。您认为EMI／ESD会影响电压电平吗？我希望你能提出一些看法。再次感谢。



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    Hello, if any one can put their views on my last post regarding Latch up of PIC controller based on description given as below...........
 
Thanks for your help,
Unfortunately schematic I can not put, but I will try to explain it. Its a medical monitoring device. Circuit is enclosed in a metallic case with battery (3 V supply) . It is having 3 lines out of it and these are not directly connected to controller but to an ASIC. Controller will drive an ASIC. 
Do you think EMI/ESD can affect the voltage levels? I hope you can put some of your views on it.
Thanks again

嗨，你怎么知道配置词被破坏了：A/你的设备没有被保护，当你读回PIC时，你会发现它们包含不同于原始ONB/你的“假设”配置词是根据应用程序行为而改变的。你的应用程序中的机翼：1 /一个BooLoad 2/一个编写内部闪存（EEPROM）的代码



      以下为原文

    Hi,
 
How do you know that configuration words are corrupted :
a/ your device is not protected and when you read back the PIC you see that they contain a different value than original one
b/ you "suppose" that configuration words are changed based on the application behaviour
 
Do you have any of the following in your application :
1/ a bootloader
2/ a piece of code that writes the internal FLASH (not EEPROM)
 
Regards

你好，不，它没有引导加载程序或闪存写代码。我得到的信息是，当PIC芯片的电压高于或低于电源电压时，整个PIC芯片会被锁存，然后通过MCLR，它也不能复位，但是电源和重新连接将启动电路。我在电路中使用一个线圈（3.3毫安，100欧姆），它通过电容器连接到PIC引脚。它被用作TX /RX天线。线圈一端连接到VDD（3VDC），另一端通过CAPA连接到两个不同的引脚。在TX /RX过程中，它有超过信号的信号，但使用次数很多，控制器工作正常。有时会产生问题吗？等待答复谢谢



      以下为原文

    Hello,
No it is not having boot loader or Flash writing code. I got info that whole PIC chip gets latched up when its pins get voltage above or below supply, then thru MCLR also it can  not be reset but remove supply and reconnect will start the circuit.I am using a coil in my circuit (3.3 mH ,100 ohms) it is connected to PIC pins through capacitor. It is used as TX/RX antenna. one end of Coil is connected to VDD (3Vdc) and other end connected to two different pins thru capa. It is having signals beyond supply at the time of TX/RX process but so many times it is used and controller works properly. Can it create problem sometimes??
Awaiting reply
Thanks  

我甚至不知道“锁上”是什么意思，你是说芯片复位了吗？你将不得不张贴一些东西。一幅图片描绘了1000个单词。



      以下为原文

    I don't even know what, "latched up" means.
Do you mean the chip is resetting?
 
You are going to have to post something.
A picture paints a 1000 words.

我认为这意味着图片锁定和反应迟钝。；）



      以下为原文

   
I think it means the PIC locked up and is unresponsive. ;)
 

后×2。芯片停止工作，复位脉冲不工作，只有电源移除使它重新运行。



      以下为原文

   
Post#2. Chip stops working, reset pulse does not work, only power removal gets it going again.
https://en.wikipedia.org/wiki/Latch-up
 

可以是代码。



      以下为原文

    Could be code.

他们说MCLR是启用的，但拉低PIN不重置PIC。



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    They say MCLR is enabled, but pulling that pin low is not resetting the PIC.
 

他什么也不会表现，所以说不出话来。



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    He won't show nothing so it's impossible to say.

谢谢你的意见。它的闩锁或悬挂。MCLR配置正确，但把MCLR低，不复位控制器，即没有从任何引脚输出。虽然32 kHz的晶体运行用于Time1，内部CLK用于系统。Time1 CLK（32.768 kHz）驱动ASIC，也用于Time1和Time3。RTC是使用Time3实现的。在输出端，NXP ESD二极管（共阳极双二极管）连接，可能在某些CKT中，这些二极管是弱的。断开电源然后再连接它启动控制器。在许多CKTS中它工作，但一些CKTS出现问题。



      以下为原文

    Thanks for your views. Its kind of latchup or hang. MCLR is configured properly, but putting MCLR low , is not reseting controller, ie no output from any pin. though 32 khz crystal is running used for timer1 and internal clk is used for system. Timer1 clk (32.768 Khz) is driving the ASIC and also it is used for timer1 and timer3 . RTC is implemented using timer3. At output terminals NXP ESD diodes (common anode double diode) are connected, may be in some ckt these diodes are weak.
After disconnecting power and then reconnecting it starts the controller.
In Many ckts it is working but some ckts are giving problem.

在数据表或PACIT文档中，它显示了如何连接MCLR。您可以使用WDT进行重置。



      以下为原文

    In the datasheet or pickit docs it shows how to wire MCLR.
You could have done a reset with WDT.

MCLR连接是可以的。我怀疑WDT可以复位控制器在闩锁的情况下。此外，我不能再生闩锁条件来验证。任何想法，产生闩锁，以便使用WDT我可以确认，这可以解决这个问题。谢谢。



      以下为原文

    MCLR connection is OK. I doubt WDT can reset controller in case of latch up . Moreover I am not able to regenerate latch up condition to verify. Any idea to generate latch up so that using wdt I can confirm that this can solve the problem.
Thanks   

绝对不可能。更容易的代码。



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    Absolutely no idea.
More likely buggy code.

我建议消除所有多余的东西，并从一个简单的脉冲开始显示芯片工作。如果你有过ESD或者把PIN放在VDD之上或者太远低于VSS，那么你可能有“Brice”它可能已经死了。回到基础。使用一个定时器或一些好的和基本的LED闪光灯，然后从那里开始工作。



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    I would recommend eliminating all the superfluous stuff and start with a simple pulse to show the chip works. If you have had an esd or have taken the pins too far above vdd or too far below vss, then you may have 'bricked' it - it may be dead.
 
Go back to basics. Get an led flashing using one of the timers or something nice and basic and then begine working from there.