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带 I²C接口的实时时钟/日历芯片
带31字节非易失性静态RAM的串行实时时钟芯片
带56字节RAM的I²C串行实时时钟芯片
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I²C
SPI
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带备用电池的 56 字节非易失性 RAM 自动掉电检测及电源切换电路
带世纪标志 12C总线从地址 警和定时器 掉电检测器
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0~80
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