LamaPLC: External FRAM memory module

FRAM (Ferroelectric RAM or F-RAM) memory modules combine the fast write speeds and near-infinite endurance of RAM with the data persistence of traditional non-volatile storage (like Flash or EEPROM).

Key Advantages of FRAM Modules Over Flash/EEPROM

• No Erase Cycle Required: Unlike Flash memory, which forces you to erase an entire sector before writing, FRAM allows instant, bit-level or byte-level random writes.
• Astronomical Endurance: Supports up to 10¹⁴ (100 trillion) write cycles, which is millions of times higher than standard EEPROM or Flash.
• Ultra-Low Power: Consumes minimal energy during write operations because it doesn't require high-voltage charge pumps

The MB85RC256 Non-Volatile FRAM Board is a high-performance memory breakout module built around Fujitsu's MB85RC256V memory chip. It bridges the gap between RAM and EEPROM, offering non-volatile data persistence combined with instantaneous byte-level write speeds and extreme endurance.

• Memory Capacity: 256 Kilobits (Kb), which translates to exactly 32 Kbytes (KB).
• Memory Organization: 32,768 words × 8 bits (byte-addressable from 0x0000 to 0x7FFF).
• Operating Voltage: 2.7V to 5.5V (fully compatible with 3.3V and 5V microcontrollers like Arduino, STM32, and ESP32).
• Communication Interface: Two-wire I²C Fast Mode Plus.
• Max Clock Speed: Up to 1.0 MHz.Read/Write Endurance: 1 Trillion (10¹²) to 10 Trillion (10¹³) cycles per byte.
• Data Retention: 95 years at +55°C, or up to 200+ years at +35°C.
• Power Consumption: 200 µA maximum active operating current (at 1 MHz), and ~27 µA standby current.

No Write Delay (Instantaneous Commit)

Traditional EEPROM or Flash memory requires an internal “charge pump” to burn data into the cells, forcing a 5ms to 10ms wait delay per write cycle. The MB85RC256 writes instantly at bus speed. It does not require a write-polling routine, completely eliminating data loss risk during sudden mid-write power failure.

I²C Addressing Flexibility

The device features a base binary slave address of 1010 (or 0x50). By hardwiring the address pins (A0, A1, A2) to either VCC or GND, you alter the final 3 bits of the address structure:

• All pins to GND: I²C Address is 0x50 (Default).
• All pins to VCC: I²C Address shifts to 0x57.

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