The Memory Plug is a small board with 1 to 4 EEPROM memory chips. With M24M01’s from STMicroelectronics, the board can have up to 512 Kbyte of memory (4x 1 Mbit).
An I2C bus running at 3.3V is used as interconnect, with all the power and signal lines brought out to to both sides of the board to allow daisy-chaining with other I2C-conforma