日志
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1、[backcolor=white][font=宋体]搜索“[/font][/backcolor][backcolor=white]sim900a_[/backcolor][backcolor=white][font=宋体]硬件设计手册[/font][/backcolor][backcolor=white].pdf[/backcolor][backcolor=white][font=宋体]”，根据文档中第[/font][/backcolor][backcolor=white]53[/backcolor][backcolor=white][font=宋体]页中的描述，绘制[/font][/backcolor][backcolor=white]SIM900A[/backcolor][backcolor=white][font=宋体]模块的原理图原件库[/font][/backcolor][backcolor=white][/backcolor]
2、[backcolor=white][font=宋体]按照标准的文件组织结构建立[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]设计的工程文件[/font][/backcolor][backcolor=white][/backcolor]
3、[backcolor=white][font=宋体]绘制原理图，添加元件，连线[/font][/backcolor][backcolor=white][/backcolor]
4、[backcolor=white][font=宋体]绘制原理图，添加封装并对器件统一命名[/font][/backcolor][backcolor=white][/backcolor]
5、[backcolor=white][font=宋体]原理图导入[/font][/backcolor][backcolor=white]PCB[/backcolor]
6、[backcolor=white][font=宋体]根据型材壳的外形绘制[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]形状，电路板的宽度必须与型材壳中电路板安装槽的宽度一致，电路板的长度根据实际情况调整，最大不要超过[/font][/backcolor][backcolor=white]120mm[/backcolor]
7、[backcolor=white][font=宋体]设定[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]设计规则：最小线宽[/font][/backcolor][backcolor=white]10mil[/backcolor][backcolor=white][font=宋体]，最小线间距[/font][/backcolor][backcolor=white]15mil[/backcolor][backcolor=white][font=宋体]，最小覆铜间距[/font][/backcolor][backcolor=white]15mil[/backcolor][backcolor=white][font=宋体]，最小过孔[/font][/backcolor][backcolor=white]35/20mil[/backcolor][backcolor=white][font=宋体]，推荐[/font][/backcolor][backcolor=white]40/24mil[/backcolor]
8、[backcolor=white][font=宋体]对[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]原件布局，可以双面放置器件，预留固定孔[/font][/backcolor][backcolor=white][/backcolor]
9、[backcolor=white][font=宋体]完成[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]布线，双面布线[/font][/backcolor][backcolor=white][/backcolor]
10、[backcolor=white][font=宋体]添加泪滴、[/font][/backcolor][backcolor=white]mark[/backcolor][backcolor=white][font=宋体]点，标识信息，覆铜[/font][/backcolor][backcolor=white][/backcolor]
2、[backcolor=white][font=宋体]按照标准的文件组织结构建立[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]设计的工程文件[/font][/backcolor][backcolor=white][/backcolor]
3、[backcolor=white][font=宋体]绘制原理图，添加元件，连线[/font][/backcolor][backcolor=white][/backcolor]
4、[backcolor=white][font=宋体]绘制原理图，添加封装并对器件统一命名[/font][/backcolor][backcolor=white][/backcolor]
5、[backcolor=white][font=宋体]原理图导入[/font][/backcolor][backcolor=white]PCB[/backcolor]
6、[backcolor=white][font=宋体]根据型材壳的外形绘制[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]形状，电路板的宽度必须与型材壳中电路板安装槽的宽度一致，电路板的长度根据实际情况调整，最大不要超过[/font][/backcolor][backcolor=white]120mm[/backcolor]
7、[backcolor=white][font=宋体]设定[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]设计规则：最小线宽[/font][/backcolor][backcolor=white]10mil[/backcolor][backcolor=white][font=宋体]，最小线间距[/font][/backcolor][backcolor=white]15mil[/backcolor][backcolor=white][font=宋体]，最小覆铜间距[/font][/backcolor][backcolor=white]15mil[/backcolor][backcolor=white][font=宋体]，最小过孔[/font][/backcolor][backcolor=white]35/20mil[/backcolor][backcolor=white][font=宋体]，推荐[/font][/backcolor][backcolor=white]40/24mil[/backcolor]
8、[backcolor=white][font=宋体]对[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]原件布局，可以双面放置器件，预留固定孔[/font][/backcolor][backcolor=white][/backcolor]
9、[backcolor=white][font=宋体]完成[/font][/backcolor][backcolor=white]PCB[/backcolor][backcolor=white][font=宋体]布线，双面布线[/font][/backcolor][backcolor=white][/backcolor]
10、[backcolor=white][font=宋体]添加泪滴、[/font][/backcolor][backcolor=white]mark[/backcolor][backcolor=white][font=宋体]点，标识信息，覆铜[/font][/backcolor][backcolor=white][/backcolor]
