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How to use AT24C02

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In the I2C bus, AT24C02 is used as a memory, the function is to store passwords. 

But I don't really understand that what is the meaning of the device address.At presentm,it is used to connect with MCU. 

Who can tell me something about the stored password? And how do the AT24C02 and single chip microcomputer coordinate work? 

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