Hardware development notes (9): basic process of hardware development, making a USB to RS232 module (8): create asm1117-3.3v package library and associate principle graphic devices

Preface

   With the schematic diagram , Can design hardware PCB, In the design PCB There is also a coordinated priority action , Mapping encapsulation , The components of the schematic library are designed by us . In order to better describe the packaging design process , This article describes a process for creating asm1117-3.3V encapsulation , Connect the components of the schematic diagram to the pin package .

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Schematic packaging analysis

  

• Serial number 1：USB Port packaging , see datasheet establish
• Serial number 2：COM encapsulation , Use dip2.54,2dip
• Serial number 3：ASM1117-3.3V encapsulation , see datasheet establish
• Serial number 4：COM encapsulation , Use dip2.54,3dip
• Serial number 5： Capacitor package , choose 0603 establish
• Serial number 6：CH340G encapsulation , see datashee establish
• Serial number 7： Crystal oscillator package , see datasheet establish
• Serial number 8：MAX232 Component packaging , see datasheet establish
• Serial number 9：CON encapsulation , Use dip2.54,5dip
     above , Actually com There is a universal ,0603 These are also general standard packages .

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establish ASM1117-3.3V encapsulation

ASM1117-3.3V Package dimension drawing of

  

establish Pad Pad （ Rectangle ,SMT Patch pad ,123 Pin ）

  
  
  
  

establish Pad Pad （ Rectangle ,SMT Patch pad ,4 Pin ）

  
  
  

establish SOT-223 encapsulation

  
  
  
  
  
  
  

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Schematic Association encapsulation

Step one ： Open the schematic project

  
  

Step two ： Double click the component to add the package