Meaning
High-speed memory retention technology stores critical configuration and state data without requiring continuous power or lengthy write cycles. By utilizing non-volatile FRAM persistence, a connected microcontroller preserves its system state instantly before entering the lowest power-down mode. This technology combines the speed of random-access memory with the data preservation of flash storage.
Hardware designs utilize this feature to secure system logs and network keys during sudden power failures.
Write Speed
Rapid data storage prevents information loss during unexpected voltage drops in harvester-powered systems. The rapid write cycles of non-volatile FRAM persistence require only a few nanoseconds, which is orders of magnitude faster than standard flash memory. This execution speed allows the firmware to save the entire stack state before the power supply falls below the operational threshold.
The system can then resume operations immediately when power returns, bypassing the initialization sequences that consume valuable boot energy and delay sensor sampling.
Energy Efficiency
Low operating currents during memory operations improve the efficiency of energy-constrained sensor nodes. Because non-volatile FRAM persistence does not require a high-voltage charge pump to write data, the current drawn during memory updates is minimal. This reduction in current prevents voltage dips on the main supply line during critical processing phases.
Sensor nodes can write data more frequently without risking battery instability.
Memory Wear
Endurance ratings of ferroelectric memory exceed those of traditional flash and EEPROM by many orders of magnitude. This high write endurance makes non-volatile FRAM persistence suitable for continuous data logging. A device can record sensor readings frequently without degrading the storage cells.
