Hardware development notes (6): basic process of hardware development, making a USB to RS232 module (5): creating USB package library and associating principle graphic devices

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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 USB encapsulation , establish DIP Pad , Connect the components of the schematic diagram to the pin package .
   The USB Is a fully defined set of packages ,DIP With fixing column .

Schematic packaging analysis

  

• Serial number 1：USB Port packaging , see datasheet establish
• Serial number 2：CON encapsulation , Use dip2.54,2dip
• Serial number 3：ASM1117-3.3V encapsulation , see datasheet establish
• Serial number 4：CON 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 USB Male port packaging

USB Package dimension drawing of the port

  
   Which is on the pin 0.92 Of pin, We can use it directly 1.0 Of pin, Therefore, the pin pad can be used in general ：
  

establish Pad Pad （ circular , Fixed pad / It can also be used as a pin ）

  
  
  
  
   Here is the final size of the copper layer to be coated , The extra blue is copper , The new building pad You need to set this before you get the blue one , Blue is the area of subsequent welding .

Create component packaging

  
  
  
  
  
  
   Put the first pad ：
  
  
  
   When you continue to put in , Find out grid The interval is too small , Change the spacing between pins to facilitate wiring （ The interval is 2mm）：
  
  
   Continue to add 2,3,4 Pin No （ here 1 and 2,3 and 4 Between for 2.5mm,2 and 3 Between for 2mm）：
  
   Then place 2 A fixed pad ：
  
  
  
  
  
  
   Then start to draw the shape ：
  
  
  
  
   Error saving “Symbol is missing a refdes.”, Because I created it myself （ Wizard not used , So no , Add the following ：
  
  
   Saved successfully ：
  

Schematic Association encapsulation

Step one ： Open the schematic project

  
  

Step two ： Double click the component to add the package

  
  

Last one ：《 Hardware development notes （ 5、 ... and ）： Basic process of hardware development , To make a USB turn RS232 Module （ Four ）： establish CON Connect device packages and associate principle primitive devices 》
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This article is original , Reprint please indicate the source of the original
This article blog address ：https://hpzwl.blog.csdn.net/article/details/125369228