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No matter what electronic eda Tools , In addition to building circuit schematics 、pcb layout outside , Another part of the work is symbol library and encapsulation Library . Pay attention to , All our development is in lceda Accomplished , You can learn according to what you have learned eda Tools , Flexible choice .
For symbol libraries , Here you can explain , It mainly uses symbols to represent specific electronic components . such as , Junior high school physics book , Use a square to represent the resistance , The capacitance is represented by two vertical lines , Use wavy lines to represent inductance , These belong to the category of symbols . Symbols only represent physical meaning , It is the abstraction of specific devices , It's purely functional . So now that there is a capacitor 、 resistance 、 Inductance these symbols , Why draw your own symbol library .
There are only two reasons ,（1） There are too many kinds of components now , It is still increasing every year , Take chips for example , Every chip company has its own chip topology , The physical meaning of each family is usually incompatible ,pin Yes pin Compatibility is only a small part ;（2）eda Its own symbols are very limited , Far from keeping up with the development of electronic devices .
For example, when we need a new chip , If eda No corresponding symbol library , You can draw a , It's not a particularly complicated thing , According to the chip Manual of the chip ,