EEPROM 2 click released.

EEPROM 2 click

EEPROM 2 click has 32 times more memory than the first EEPROM click, 256 KB to be exact. It carries ST’s M95M02 chip that’s specified for more than 4 million write cycles. The communication with the microcontroller is done through the mikroBUS™ SPI interface.

The chip also has the capability to write up to a page of memory in a single write cycle. So instead of writing byte by byte, retrieving the new address every time like a conventional EEPROM chip would do, this one can start from a given address and subsequent bytes will be shifted down until the end of the 256 byte page.

And now, a short and simplified history of EEPROM in three prefix letters.


First there were ROM chips, which had to be programmed in the factory during production. The P was added in 1956 when a guy named Wen Tsing Chow figured out how to burn individual bits off. So manufacturers could ship chips with all bits set to 1, and by burning out individual connections you’d set certain bits to 0 until the final configuration — the firmware — was permanently loaded. So now it was programmable.


The E was added thanks to Dov Frohman from Intel, in 1972. This is when chips started having tiny windows through which you would shine a UV light to erase everything. So the chips were now both programmable and erasable. Albeit you had to remove them from the circuit every time you needed to reconfigure.


Finally in 1977 they figured out how to erase the bits without UV and without having to remove the chips. A certain Eli Harari is credited with adding that second E — which, as you know, stands for electrically. Electrically Erasable Programmable Read Only Memory.

Okay, now on to the product page for more details about this particular EEPROM module and this click board. For code, go to Libstock.


Yours sincerely,

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