3.3.4 Dual Serial EEPROM

The SAMA7G54-EK board embeds two Microchip 24AA025E48 serial Electrically-Erasable Programmable Read-Only Memories (EEPROMs).

The 24AA025E48 features 2048 bits of serial EEPROMs organized as 256 words of eight bits each and is accessed via an I²C-compatible (2-wire) serial interface. In addition, the 24AA025E48 incorporates an easy and inexpensive method to obtain a globally unique MAC or EUI address (EUI-48). For more information about the 24AA025E48, refer to the product web page.

An EUI-48 address can be assigned as the actual physical address of a system hardware device or node, or it can be assigned to a software instance. Such addresses are factory-programmed by Microchip and unique. They are permanently write-protected in an extended memory block located outside the standard 2-Kbit memory array.

Each EEPROM has a specific I²C address and is connected to the same TWI bus interface.

• EEPROM1 (U12) I²C address: 1010_010[R/W]
• EEPROM2 (U13) I²C address: 1010_011[R/W]