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Well, I looked all over and I guess ESD + resistor is indeed the best option. I'll use an ESD protection IC, very small and very chip. Can't go wrong with it. The zener diode to limit voltage at the IC pin is also interesting, but a short on that output would burn both the diode and the pin. But...
I understand. But unfortunately due to backwards compatibility it has to be serial communications but without RS232 voltage levels, and 3.3V levels instead. But I'm worried about putting the MCU IO pins on a connector to the outside world, even with ESD protection diodes. So I was looking for...
Hello everyone,
I'm looking for an IC to allow an MCU to safely communicate with external equipment via serial, but instead of RS232 voltage levels it's simply 3.3V (0V / 3.3V logic levels). Does anyone know of any? All I can find are regular buffer/drivers, and the closest I found are CAN...
What I read is that characteristic impedance is very hard to measure, and is only measured with expensive instruments. Is that true?
It does seen kinda simple: measure the capacitance of the cable (charge it with constant current, then discharge it with constant current), and measure the...
Hmmm... now I understand it! Thanks very much!
But just to make it absolutely clear:
1) The inductance (L) and capacitance (C) per unit length of an entire cable can indeed be obtained by measuring the inductance and capacitance of that entire cable and then dividing it by the cable's length...
Oh believe me, I've seen so many videos and read so many documents online trying to understand this. Most talk about an infinite array of inductors and capacitors, and most show inductors also on the bottom segment of the line (the video you posted shows inductors only on the top segment).
But...
2) But does the characteristic impedance of the differential pair changes a lot due to the ground plate?
3) That's something I don't understand. I thought characteristic impedance depended on the capacitances. So, will that wire's characteristic impedance change if I increase its length?
I...
Hello!
I'm routing a PCB that has a gigabit Ethernet, and that requires differential pairs with a target characteristic impedance. So I went studying about characteristic impedance, as it's something I never had to consider before, and although I understand it a little better now I still have a...
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