## Electronic Specifications of the M95M01-R The **M95M01-R** is a high-performance, 1-Mbit (128 KB) Serial SPI (Serial Peripheral Interface) EEPROM manufactured by STMicroelectronics. It is designed for low-voltage applications requiring reliable non-volatile memory storage. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 1 Megabit (1,048,576 bits) | | **Organization** | 131,072 words of 8 bits each (128 KB) | | **Interface** | SPI (Serial Peripheral Interface) | | **Operating Voltage ($V_{CC}$)** | 1.8 V to 5.5 V | | **Clock Frequency** | Up to 16 MHz (at 4.5V) / 5 MHz (at 1.8V) | | **Page Size** | 256 Bytes | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Pins Description The device typically comes in an 8-pin package (SO8 or TSSOP8). The pinout functions are as follows: | Pin Name | Type | Description | | :--- | :--- | :--- | | **S** | Input | **Chip Select:** Activates the device when pulled Low. | | **D (MOSI)** | Input | **Serial Data Input:** Used to transfer data into the device. | | **Q (MISO)** | Output | **Serial Data Output:** Used to transfer data out of the device. | | **C (SCK)** | Input | **Serial Clock:** Provides the timing for serial communication. | | **W** | Input | **Write Control:** Provides hardware write protection. | | **HOLD** | Input | **Hold:** Pauses communication without deselecting the device. | | **$V_{CC}$ / $V_{SS}$** | Power | Supply Voltage / Ground. | --- ### 3. Core Features and Performance * **Write Cycle Time:** A byte or a full page (256 bytes) can be written in under **5 ms**. * **Endurance:** High reliability with **4 million write cycles**. * **Data Retention:** Guaranteed for **200 years** at room temperature. * **Status Register:** Includes a status register to monitor "Write In Progress" (WIP) and set write protection blocks. * **Low Power Consumption:** * Active read current: 2 mA (max at 5 MHz). * Standby current: 5 µA (max). --- ### 4. Software Implementation (Basic SPI) To communicate with the M95M01-R, the master device must send an instruction code. Common instructions include: ```c // Standard SPI Opcode Examples for M95M01-R #define WREN 0x06 // Write Enable #define WRDI 0x04 // Write Disable #define RDSR 0x05 // Read Status Register #define WRSR 0x01 // Write Status Register #define READ 0x03 // Read from Memory Array #define WRITE 0x02 // Write to Memory Array ``` --- ### 5. Application Areas * **Industrial:** Parameter storage for sensors and actuators. * **Medical:** Patient data logging in portable devices. * **Consumer Electronics:** Firmware updates and configuration storage in smart devices.