[{"title":"( 2 个子文件 302KB ) 4X4矩阵键盘原理图PCB工程文件测试例程","children":[{"title":"4X4矩阵键盘原理图PCB工程文件测试例程","children":[{"title":"矩阵键盘DXP资料.zip <span style='color:#111;'> 96.99KB </span>","children":null,"spread":false},{"title":"矩阵键盘相关程序 仿真.zip <span style='color:#111;'> 216.16KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]