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你好，5509A上的RTC需要怎么供电呢？在断电的情况下，需要几伏的电压呢？有没有技术文档可以参考？
谢谢
可以看一下数据手册第81页开始的电气特性表，RDVDD，RCVDD管脚供电要求，不同的主频需要不同的电压。http://www.ti.com/lit/ds/symlink/tms320vc5509a.pdf
