One day. I am writing in my training journal.
"Electricity isn't something that goes away once you use it; it's something that's always flowing.
If you don't connect a device or board to ground, there is no way for the current to escape, so it just keeps flowing through the conductors.
If that happens, the circuit will short-circuit..." When I was typing the sentence, I received a no-no from a senior.
Senior: "That's not a short circuit. It's an open circuit."
Me - "What do you mean by open?"
Senior: "It means that electricity is not flowing. It's not connected, so electricity doesn't flow.
I "Oh..."
Let me briefly explain these two phenomena,
- Short: A state in which the power supply and ground are directly connected without any intervention.
- Open: A state in which the power supply and ground are not connected.
In open, no current flows, so devices and circuits do not operate.
But short is a state in which the power supply and ground are connected without any resistance.
From Ohm's law "current = voltage ÷ 0 Ω = ∞", an infinite current is flowing.
In other words, a large current flowing into the transmission line could damage the power supply source or cause damage to peripheral components.
Altera's FPGAs and CPLDs also have Absolute Maximum Ratings.
In a nutshell, it is "the value at which the device will break if this value is exceeded.
It is called "Absolute Maximum Ratings.
The absolute maximum ratings vary depending on the type of power supply, so it is necessary to check the absolute maximum ratings one by one.
These values vary by device family, but the table above is for the Cyclone® IV.
For example, if the I/O voltage level is 3.3 V, 3.3 V will be supplied by mistakenly connecting VCCINT (power supply for internal core) to VCCIO (power supply for I/O). When I carefree mumbled that I had learned one more thing, a senior said to me
"If you break both of the devices that we provided you for the production training, you'll have to pay for them yourself from now on."
He left with these words.
I had to make a strong vow to check the soldering and wiring before I turned on the power!
I couldn't help but vow to myself, "...I'll check the soldering and wiring before I turn on the power!"
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