将其他电路与ICSP CLK隔离的最小电阻值是多少？

你对设备进行编程并查看它是否有效。



      以下为原文

    You program the device and see if it validates.

肖特基二极管将完成这项工作。来自IRR的V＆U-VUT——PRGDAT1



      以下为原文

    A Schottky diode will do the job.
 
 
  |<----VOUT from IRR
  |
--------PRGDAT1
 
 

嗨，在14引脚的封装上，没有那么多引脚可供选择。也许有人已经猜到，在调试期间，您可能没有外部Vref。在我看来，至少对于一些芯片、模拟参考、AVdd、AVss和模拟外设可以位于一端，或者位于同一端。封装的rner，连同ICSP，假定在生产中是不活动的，而更嘈杂的电机控制外围设备在另一端有连接。我不知道如何安排编程工具的连接，因此这可能不实用：如果ICSP连接是5或6引脚SIP，PICkit 3样式，在ICSPCLK旁边放置一个Vref的管脚在L位置，当程序员断开连接时，在ICSPCLK和Vref管脚之间安装一个跳线。缺点可能是，如果这样做的轨迹更长，或者循环区域更多，那么可能会拾取更多的噪声。



      以下为原文

    Hi,
On a 14 pin package, there isn't that many pins to choose from.
 
A guess may be that someone have figured that you may be able to go without external Vref during debugging.
Seem to me, that at least for some chips, analog reference, AVdd, AVss and analog peripherals may be located in one end, or corner of the package, together with ICSP that presumably will be inactive in production,
while more noisy motor control peripherals have connections at the other end.
 
I do not know how you arrange connection of the programming tool, so this might not be practical:
 
If ICSP connection is 5 or 6 pin SIP, PICkit 3 style, place a pin for Vref next to ICSPCLK in a L position,
and mount a jumper between ICSPCLK and Vref pin when programmer have been disconnected.
 
Disadvantage may be that if this make longer traces, or more loop area, it may pick up more noise.
 
Regards,
   Mysil

你不需要跳线。肖特基二极管将隔离电路并停止进入芯片的数据进入您使用的设备。我在PRGDATA上使用了红外器件。大约4V的下降。10BQ030.皮卡2页第31页。裁判。



      以下为原文

    You don't need jumpers.  A Schottky diode will isolate the circuit and stop data going into the chip from going into the device you are using.
 
I've used infrared devices on prgdata.
Roughly a .4v drop. 10BQ030.
 
On page 31 of Pickit 2. ref.
 
 

嗨，我不认为功率肖特基二极管的0.4V下降是无论如何可以接受的，当原始海报投资使用精确的电压基准为Vref+输入到ADC和DAC。如果基准电压是4.096V，10位ADC和10位DAC的分辨率是4毫伏。



      以下为原文

    Hi,
I don't think a 0.4 V drop in a power schottky diode will be anyway acceptable,
when Original Poster invest in using a precision voltage reference for Vref+ input to ADC and DAC.
 
Resolution of 10-bit ADC and 10-bit DAC is 4 millivolt if reference voltage is 4.096 V.
 
   Mysil

谢谢你的想法，Mysil，我是相同或类似的。任何精密的电压基准都不再精确，如果它漂浮在电阻器的错误端。在这种情况下，唯一的解决办法是减少引脚到接地的电容器的潜在噪声，正如您建议的连接后编程。我茫然不知如何使用任何二极管作为解决方案。回到现在的问题-什么最小电阻值我可以摆脱使用？我知道电源3可以处理相当大的电流来拉压针高和低。精密电压基准源可以达到20mA。



      以下为原文

    Thanks for your thoughts Mysil, I am of the same or similar in opinion.
 
Any precision Voltage reference is no longer precision if it's left floating around at the wrong end of the resistor. In this case the only solution is to reduce potential noise with a capacitor at the pin to ground, as you suggest connected post programming.
I'm at a loss to comprehend how to use any diode as solution.
 
Back now to the question - What minimum  resistor value could I get away with using?
I know the Promate 3 can handle quite high currents to pull-push pins high and low. The precision voltage reference can source sink 20mA.