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TPS659039电源管理芯片的RTC功能如何外接纽扣电池

你好,我在使用tps659039电源管理芯片的时候,需要用到它的RTC功能,但是系统断电时,该功能仍需保持。因此需要增加纽扣电池给RTC供电,请问该如何使用?