Can a EEPROM be used as an external device?
If your design requires more EEPROM capacity then you can add an external EEPROM. As EEPROMs operate on a bit level they are usually designed to use serial data, in other words, data that is transmitted one bit at a time. This has lead to the development of many I2C-based EEPROM devices.
How to use serial EEPROM for storing data?
In a previous How-To, we looked at how an Arduino Mega 2560 can be used to interface with a Parallel EEPROM memory chip. In this How-To, we will look at how an Arduino can use an I2C serial EEPROM for storing and retrieving data. If playback doesn’t begin shortly, try restarting your device. Full screen is unavailable. Learn More
What’s the difference between EEPROM and other memory types?
Compared to the aforementioned memory types an EEPROM has a very small amount of storage, in fact, EEPROM capacities are commonly measured in Bits as opposed to Bytes. Since they only store a small amount of data they don’t consume a great deal of current, making them ideal for battery and low-powered applications.
How long does an EEPROM last at room temperature?
While EEPROM technology is constantly improving todays EEPROMs can retain data for about 10 years at room temperature before it becomes corrupted. Rewriting that data will start the counter again, prolonging the life of the EEPROM.
Which is cheaper EEPROM or SPI flash memory?
At higher capacities, SPI flash is way cheaper than eeprom, with capacities in the 1-32 megabit range. Main difference is it is block, not byte eraseable and 3.3v only. ALways SPI, not I2C, but I2C gets too slow for large memories anyway.
Which is better internal or external EEPROM for Arduino?
Another advantage with many I2C EEPROMs is that they have a larger write-cycle tolerance than the 100,000 writes you are limited to with the Arduino internal EEPROM. We will start our EEPROM experiments using the internal EEPROM in the Arduino.