介绍串行时钟芯片DS1305的功能、结构及其利用DS1305设计的电源开关电路，可使数据采集系统平时处于关闭状态。定时开启时系统上电，进行数据采集；一次工作结束时关闭开关，系统断电-introduced DS 1350 serial clock chip function DS 1350 and the use of structural design of the power switch circuits, data acquisition system can normally closed. Timing opened electrical systems, data acquisition; A working off switch at the end, the system power outages