In actual applications, the data stored in the RAM of the microcontroller is lost after power failure. The data stored in the FLASH of the microcontroller cannot be changed at will, that is, it cannot be used to record the changed values. However, in some occasions, we do need to record certain data, and they often need to be changed or updated. The data cannot be lost after a power failure. For example, the degree of our household electricity meter and the channel memory in the TV are generally Use EEPROM to save data, the feature is that it will not be lost after power failure. The device used on our board is 24C02, which is an EEPROM with a capacity of 2Kbits, which is 256 bytes. Under normal circumstances, EEPROM has a life span of 300,000 to 1 million times, that is, it can be repeatedly written 300 to 1 million times, and the number of reads is unlimited.
24C02 is a device based on the I2C communication protocol, so from now on, our I2C and our EEPROM will be integrated. But everyone must be clear, I2C is a communication protocol, it has strict communication timing logic requirements, and EEPROM is a device, but this device samples the I2C protocol interface to connect to the microcontroller, there is no necessary connection between the two, EEPROM Other interfaces can be used, and I2C can also be used on many other devices.
Electronic Components Transformer
Transformer is a device that USES the principle of electromagnetic induction to change the ac voltage. Its main components are primary coil, secondary coil and iron core.The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), etc.According to use can be divided into: power transformer and special transformer (electric furnace change, rectifier, power frequency transformer, voltage regulator, mining, audio transformers, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.).The circuit symbol T is often used as the beginning of the number. Examples: T01, T201, etc.
Electronic Components Transformer, Electrical Transformer, AC Transformer, 12V Transformer
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