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Most AVRs have a small EEPROM which can be used to save variables, configuration setting etc. Like Chip Atmega32u4 Xadow Main Board used has 1K Bytes Internal EEPROM. If you want more storage for your Xadow project, this module is designed for you! This module supplies two extra 32K byte for your project. The Xadow Storage can be powered by 3.3V. And it is compatible with Xadow system.
Note: This module is not compatible with any other Xadow version 2 or RePhone modules.
Xadow is a though small but perfectly formed Arduino(TM) compatible board series containing several modules. It's a kit extremely suitable for space-sensitive projects such as wearable devices & arts designs, which have higher request on size, weight and flexible cascade connection.
Xadow Storage eagle file
Serial EEPROM AT24C256C Datasheet