Hardware development notes (10): basic process of hardware development, making a USB to RS232 module (9): create ch340g/max232 package library sop-16 and associate principle primitive 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 CH340G and MAX232 Chip package creation （SOP-16）, And the components of the schematic diagram are associated with the pin package .

 

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 .

 

establish CH340G encapsulation

CH340G Package size

  
  
  

establish Pad Pad （ Rectangle ,SMT Patch pad , Common pins ）

  
  
  
  

establish Pad Pad （ Rectangle with rounded corners ,SMT Patch pad , First pin ）

   Continue to new ：
  
  
  

establish SOP-16 encapsulation

  
  
  
  
  
  
  
  
  
  

 

Schematic Association encapsulation

Step one ： Open the schematic project

  
   

Step two ： Double click the component to add the package

  
  

 

establish MAX232 encapsulation

MAX232 encapsulation

  Max232 Two kinds of , A kind of dip, A kind of so, Found in CH340G Of sop-16 It's the same .
   

establish SOP-16 encapsulation

  SOP-16 Encapsulated with the previous CH340G It's the same , So we are not creating here , Just use it directly .

 

Schematic Association encapsulation

Step one ： Open the schematic project

  
   

Step two ： Double click the component to add the package