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在最优化的情况下，根据AN5170 imx6ul 电源耗电手册，VDD_SNVS的耗电是22uA@3SNVS的实测耗电是22uA@3.3V

由于SNVS的最低工作电压为2.4V，对于一个CR2032的电池，放电到2.4V时最大的可用容量大概为200mAh，该容量在室温下最多能让该RTC坚持一年的时间。

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