## Technical Overview of M95320-RMB6TG The **M95320-RMB6TG** is a high-performance, low-voltage Serial Peripheral Interface (SPI) EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. It is designed for applications requiring non-volatile storage with high reliability and low power consumption. ### Key Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 20 MHz (at 4.5V - 5.5V); 5 MHz (at 1.8V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +85°C | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### Internal Electronic Architecture 1. **Memory Array:** Organized as 4,096 words of 8 bits each. It uses specialized floating-gate transistors to retain data without power. 2. **Control Logic:** Handles the decoding of SPI instructions (WREN, WRDI, RDSR, WRSR, READ, WRITE). 3. **Write Protection:** Includes a hardware Write Protect ($\bar{W}$) pin and software-defined block protection bits within the Status Register. 4. **Page Buffer:** Features a 32-byte page write buffer, allowing multiple bytes to be written in a single internal write cycle (typically 5ms). ### Pin Configuration (UFDFPN8) | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1 | $\bar{S}$ | Chip Select (Active Low) | | 2 | Q | Serial Data Output | | 3 | $\bar{W}$ | Write Protect | | 4 | $V_{SS}$ | Ground | | 5 | D | Serial Data Input | | 6 | C | Serial Clock | | 7 | $\bar{HOLD}$ | Pause Serial Communication | | 8 | $V_{CC}$ | Supply Voltage | --- ### Key Operational Features * **SPI Protocol:** It operates as a slave device. Data is latched on the rising edge of the clock (C) and shifted out on the falling edge. * **Hold Function:** The $\bar{HOLD}$ pin allows the master to pause communication without resetting the Chip Select ($\bar{S}$), which is useful when sharing the SPI bus with other high-priority peripherals. * **Status Register:** A 1-byte register used to check the progress of write operations (WIP bit) and manage write-enable status (WEL bit). ### Application Use-Cases * **Parameter Storage:** Storing calibration data or user preferences in consumer electronics. * **Device Configuration:** Holding boot-up settings for microcontrollers or FPGAs. * **Medical & Industrial:** Due to the high endurance (4M cycles), it is ideal for logging sensors that update frequently.