The **M95080-RBN3T** is a specific variant of an Electrically Erasable Programmable Read-Only Memory (EEPROM) chip manufactured by **STMicroelectronics**. It is commonly used in automotive and industrial applications for non-volatile data storage. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (1,024 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 5 MHz (at 2.5V - 5.5V) / 2 MHz (at 1.8V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 3) | | **Package** | PSSOP8 (TSSOP8) | | **Write Cycles** | More than 4 million cycles | | **Data Retention** | More than 200 years | --- ### 2. Part Number Breakdown (M95080-RBN3T) Understanding the suffix helps identify the exact physical and electrical properties: * **M95**: SPI family of EEPROMs. * **080**: Density (8 Kbit). * **-R**: Range of supply voltage (1.8V to 5.5V). * **BN**: Package code for **PSSOP8** (also known as TSSOP8, 169 mil width). * **3**: Temperature range (-40°C to +125°C). * **T**: Tape and Reel packaging (for automated SMT assembly). --- ### 3. Core Features #### SPI Protocol Support The device supports high-speed communication using four signals: 1. **S (Chip Select):** Activates the device. 2. **D (Serial Data Input):** Receives instructions and data. 3. **Q (Serial Data Output):** Sends data to the microcontroller. 4. **C (Serial Clock):** Synchronizes data transfer. #### Data Protection * **W (Write Protect):** A hardware pin to prevent unauthorized write operations. * **HOLD:** Allows pausing communication without deselecting the device. * **Status Register:** Contains bits to lock specific blocks of memory (Quarter, Half, or Whole) as Read-Only. #### Efficiency * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single cycle (typically < 5ms). * **Low Power Consumption:** Optimized for battery-operated devices during standby mode. --- ### 4. Typical Application Circuit ```mermaid graph LR MCU[Microcontroller] -- SCK --- CLK[M95080 CLK] MCU -- MOSI --- SI[M95080 SI] MCU -- MISO --- SO[M95080 SO] MCU -- CS --- S[M95080 S] VCC(3.3V) --- VCC_PIN[M95080 VCC] GND --- GND_PIN[M95080 GND] ``` ---