The **M95080-RDS3T** is a 8-Kbit serial SPI (Serial Peripheral Interface) EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. It is designed for low-power and low-voltage applications. --- ### ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (1,024 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Package Type** | TSSOP8 (3x4.4 mm) | | **Operating Temperature** | -40°C to +125°C (Grade 3) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### ## Key Features & Components ### 1. SPI Protocol Support The device operates in SPI modes 0 and 3. It communicates using four main signals: * **S (Chip Select):** Activates the device. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Sends data to the host controller. * **C (Serial Clock):** Synchronizes data movement. ### 2. Write Protection The M95080-RDS3T includes several hardware and software protections to prevent accidental data corruption: * **W Pin (Write Protect):** A physical pin used to freeze the Status Register. * **HOLD Pin:** Allows the master to pause communication without deselecting the device. * **WIP (Write In Progress) Bit:** A status bit that indicates if an internal write cycle is currently active. ### 3. Block Protection The memory can be software-protected in segments (None, Quarter, Half, or Whole memory) via the Status Register bits. --- ### ## Common Applications * **Automotive Systems:** Storing calibration data and error logs (thanks to the high temperature range). * **Consumer Electronics:** Configuration settings for smart devices. * **Industrial Control:** Parameters for PLCs and sensor modules. * **Medical Devices:** Storing patient settings or device history. --- ### ## Sample Instruction Set To interact with the chip, the controller sends 8-bit opcodes: ```c // Standard SPI Opcodes for M95080 WREN = 0x06; // Write Enable WRDI = 0x04; // Write Disable RDSR = 0x05; // Read Status Register WRSR = 0x01; // Write Status Register READ = 0x03; // Read from Memory Array WRITE = 0x02; // Write to Memory Array ```