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实时时钟芯片,rtc,RTC,总线IIC,内置晶振,外置晶振,校时内部外部, VBAT脚,精度RTC,32K输出, INT输出, 温度补偿, SRAM,管脚可容,VDD,内置谐振电容,事件时间截,数字补偿,数据保护锁,数据校验功能

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