2Kbit I²C EEPROM for config storage
The STMicroelectronics M24C02-WMN6TP is a 2Kbit serial EEPROM organized as 256 x 8 bits, accessed over an I²C bus at up to 400 kHz. It stores calibration data, device serial numbers, or small configuration tables — the kind of non-volatile scratchpad a microcontroller needs to remember across power cycles.
Write-cycle timing and page writes
The write cycle time for a word or page is 5 ms. The 900 ns access time applies to the read cycle; at 400 kHz the bus period is 2.5 µs, so the EEPROM keeps up without wait states.