DS1302是低功耗实时时钟芯片，它可以对年、月、日、周、时、分、秒进行计时，且具有闰年补偿等多种功能。主要特点是采用串行数据传输，可为掉电保护电源提供可编程的充电功能，并且可以关闭充电功能(DS1302 is a low-power real-time clock chip. It can schedule time, month, day, week, time, minute and second, and has multiple functions such as leap year compensation. The main feature is serial data transmission, which can provide programmable charging function for the power failure protection power, and can turn off the charging function.)