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am335x RTC供电问题

Other Parts Discussed in Thread: TPS65217

am335x上的datasheet上写明RTC的POWER需要在1.71V到1.89V之间,但市面上基本上没有1.8V的纽扣电池,而且普通的纽扣电池在使用过程中电压会越来越低,很难满足RTC的要求,如果我想用am335x内部的RTC,应该如何给它供电?