The AT24C02 chip is an EEPROM device with an IIC interface. The so-called EEPROM is an electrically erasable programmable read only memory, which is a kind of ROM. It is a read-only memory, that is, power-down can continue to store data, while at the same time can be erased and rewritten under the action of ordinary voltage, which greatly facilitates the development of the single-chip microcomputer, and now many ROMs on the computer Is the EEPROM used.