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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
2022-07-06 20:42:00 【51CTO】
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 .
<br>
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 .
<br>
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
<br>
Schematic Association encapsulation
Step one : Open the schematic project
Step two : Double click the component to add the package
<br>
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 .
<br>
Schematic Association encapsulation
Step one : Open the schematic project
Step two : Double click the component to add the package
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