1/25/2024 0 Comments Flash eeprom transistor schematic![]() Normally this is how data will be read/written byte by byte. First the address of the location to which the data must be read/written should be specified followed by the data. Once the communication is successful, the MCU can be programmed to read/write data to the EEPROM by calling the right register values. Data can be read from the EEPROM at all conditions irrespective of the status of the WP pin. Normally this pin will be grounded (logic 0) when the protection is note needed. Else the data written on the EEPROM will remain as such. The data can be written or erased on the EEPROM only if the WP pin is held low (logic 0). The Write Protect WP (pin 7) is provided for improving data security in the IC. In the above diagram we have connected the three pins to the GPIO pins so that we can cascade more than one EEPROM IC if required. These three pins are useful only if more than one I2C device or EEPROM is connected to the same microcontroller, else three pins can be grounded directly. Other than that we have three chip select pins namely A0, A1, and A2. This will keep the bus at high state during idle condition. Also like all I2C communication we have pulled the SCK and SDA line high using two pull-up resistors or while 4.7k. The Serial Clock SCK (pin 6) is connected to the Serial clock pin of the microcontroller and the Serial Data SDA (pin 5) is connected to the Serial Data pin of the microcontroller. To interface it with a MCU just power the IC (usually with 3.3V or 5V) and connect the communication lines as shown below. The 24LC512 EEPROM IC communicates with help of I2C protocol. Read the 24LC512 datasheet at the bottom to know more about the IC. So if you are looking for an EEPROM IC with storage of 512KB and works on I2C then this IC might be the right choice for you. ![]() Also the Read current for the IC is only 40uA which makes it ideal for battery operated applications. The IC works with help of 2-wire protocol ( IIC/ I2C) and hence it is easy to interface with most of the MCU’s and consumes less number of pins. ![]() Each IC comes with a storage space of 512Kb and can be cascaded with 8 similar IC if expansion is required. It has a wide operating voltage range from 1.7V to 5.5V, which makes it ideal to be used both for 3.3V systems and 5V systems. Then the information can be retrieved or over-written when required. As we know EEPROM stands for Electrically Erasable Programmable Read-Only Memory, we can store information on this IC and it will remain there even when the power is turned off just like your pen drive. The 24LC512 is a 512 Kilo Bit, 8-pin EEPROM IC. Note: Complete technical information can be found in the 24LC512 Datasheet linked at the bottom of this page. Available in 8-pin DIP, SOIJ, SOIC and TSSOP packages.If connected to Vss write is enabled, if connected to Vcc write is disabled. User configured Chip Select pins, useful during cascading ![]()
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