The **M95M01-RMW6TP** is a high-density, high-performance Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by **STMicroelectronics**. It is widely used in industrial and consumer electronics for non-volatile data storage. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 1 Megabit (128 Kbytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 10 MHz | | **Operating Voltage** | 1.8V to 5.5V | | **Package Type** | SO8N (150 mil width) | | **Write Cycles** | 4 million cycles (per byte) | | **Data Retention** | 40 Years | | **Operating Temp** | -40°C to +85°C | --- ### 2. Functional Electronic Components The internal architecture of the chip consists of several critical stages: #### A. The Memory Array The core is a **1-Mbit EEPROM array** organized as 131,072 bytes. It uses floating-gate technology to retain data even after power is removed. #### B. SPI Control Logic The chip communicates via a 4-wire SPI bus: * **S (Chip Select):** Activates the device. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Sends data out. * **C (Serial Clock):** Synchronizes data transfer. #### C. Write Protection Logic To prevent accidental data corruption, the chip includes: * **W (Write Protect) pin:** A hardware pin to lock the memory. * **Status Register:** Contains software bits (BP0, BP1) to protect specific blocks of memory. * **WEL Bit:** A "Write Enable Latch" that must be set before any write operation. #### D. Charge Pump Since the internal floating-gate cells require a higher voltage to "tunnel" electrons during a write cycle than the 1.8V-5.5V supply, the chip includes an internal **Charge Pump** to boost the voltage internally for programming operations. --- ### 3. Pinout Configuration (SO8N) | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S** | Chip Select | | 2 | **Q** | Serial Data Output | | 3 | **W** | Write Protect | | 4 | **VSS** | Ground | | 5 | **D** | Serial Data Input | | 6 | **C** | Serial Clock | | 7 | **HOLD** | Pause serial communication without resetting | | 8 | **VCC** | Supply Voltage | --- ### 4. Typical Application Circuit When integrating this part into a PCB design: * **Decoupling:** A 100nF ceramic capacitor should be placed close to the **VCC** and **VSS** pins to filter power noise. * **Pull-up Resistors:** It is common practice to place a pull-up resistor on the **S (Chip Select)** line to ensure the chip remains disabled during microcontroller boot-up.