STMicroelectronics X-NUCLEO-EEPRMA2

Overview

X-NUCLEO-EEPRMA2 from STMicroelectronics is an Arduino UNO R3–compatible expansion board for evaluating I²C (M24xx series) and SPI (M95xx series) EEPROMs, supporting up to 1 Mbit I²C and 4 Mbit SPI memory densities, with on-board solderable footprints for multiple EEPROM packages including SO8N, TSSOP, DFN8, and WLCSP, used in industrial sensor calibration and manufacturing traceability storage.

For engineers reviewing the X-NUCLEO-EEPRMA2 datasheet, X-NUCLEO-EEPRMA2 pinout, X-NUCLEO-EEPRMA2 application, or X-NUCLEO-EEPRMA2 equivalent, this board enables rapid validation of external non-volatile memory interfaces across STM32 Nucleo platforms including NUCLEO-F401RE and NUCLEO-L053R8, with pre-integrated firmware support and hardware-selectable bus routing.

Technical Context

The board implements dual-bus memory evaluation capability: I²C interface routed to CN6/CN7 Arduino headers with configurable write-protect (WC) and pull-up resistors, and SPI interface routed to CN5/CN8 with dedicated MOSI/MISO/SCLK/CS/HOLD/WE pins, supporting both standard and high-speed modes per M24xx and M95xx device families.

Hardware design includes selectable VCC sourcing (3.3 V from Nucleo or external supply), jumper-configurable EEPROM selection (U5/U6/U7/U8/U9), and test points for current measurement and signal probing-enabling precise characterization of read/write timing, endurance, and power consumption under real MCU control.

Key Specifications

Availability

X-NUCLEO-EEPRMA2 is available at Aetrix Electronics and suitable for industrial sensor calibration, manufacturing traceability systems, and embedded device configuration storage requiring stable component supply and long-term firmware maintainability.

Supply support for X-NUCLEO-EEPRMA2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, analog ICs, MEMS, power devices, and development tools for industrial, automotive, and consumer applications.

X-NUCLEO-EEPRMA2 belongs to ST's Nucleo expansion board product line, engineered to accelerate prototyping of external memory interfaces for STM32-based embedded systems with standardized mechanical and electrical interoperability.

FAQ

Does X-NUCLEO-EEPRMA2 require external power?

No - it draws 3.3 V power directly from the host Nucleo board via Arduino UNO R3 connectors. An optional external 3.3 V supply can be applied through J6 for isolated current measurement or higher load testing, controlled by solder bridge SB1.

Which EEPROM packages are supported out-of-the-box?

The board supports SO8N (U5, U8), TSSOP (U6, U8), DFN8 (U7), and WLCSP (U9) packages. Each position includes matching decoupling capacitors, pull-up/pull-down resistors, and dedicated VCC/GND routing per device family requirements.

Can I use X-NUCLEO-EEPRMA2 with non-ST MCUs?

Yes - its Arduino UNO R3 and Morpho pinouts are electrically generic. Users must ensure voltage-level compatibility (3.3 V logic), correct I²C/SPI peripheral mapping, and adapt ST's provided firmware or develop custom drivers for non-STM32 platforms.

Is there hardware-level write protection for EEPROMs?

Yes - I²C devices use the WC (Write Control) pin routed to CN6 pin 7, configurable via jumper JP1; SPI devices use the WPn (Write Protect) pin accessible at U6/U8/U9 footprints and controllable via jumpers JP3/JP4/JP5 for selective sector protection.