Single-wire EEPROM for GPIO-constrained designs
The Microchip 11AA020-I/SN is a 2Kbit serial EEPROM that communicates over a single-wire bus, freeing up I2C or SPI pins on the host MCU.
Write-cycle timing and firmware scheduling
Each word or page write takes 5ms, so the firmware must either poll the device or insert a delay before the next write attempt. This is typical for serial EEPROMs in this density class, but worth budgeting in the scheduler if the application writes calibration data or configuration parameters during normal operation.
No external level shifting is needed when the host MCU runs at 3.3V or 5V, which simplifies the BOM on mixed-voltage boards.