The **M95320-RMB3P** is a specific variant of a serial SPI (Serial Peripheral Interface) EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. --- ### 1. General Specifications The part number can be broken down to understand its core electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage** | 1.8V to 5.5V (Low voltage range) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | --- ### 2. Key Electronic Features * **Write Protection:** Includes a hardware Write Protect (`W#`) pin and a software-defined Status Register to prevent accidental data overwriting. * **Endurance:** High reliability with up to **4 million write cycles**. * **Data Retention:** Rated for more than **200 years**, making it ideal for long-term configuration storage. * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single instruction cycle. * **Self-Timed Write Cycle:** The internal write cycle is automatically timed (typically 5ms), freeing up the MCU for other tasks during the physical write process. --- ### 3. Pinout Configuration (UFDFPN8) The device typically follows the standard SPI EEPROM pinout: | Pin | Name | Description | | :--- | :--- | :--- | | 1 | `S#` | Chip Select (Active Low) | | 2 | `Q` | Serial Data Output (MISO) | | 3 | `W#` | Write Protect | | 4 | `Vss` | Ground | | 5 | `D` | Serial Data Input (MOSI) | | 6 | `C` | Serial Clock | | 7 | `HOLD#` | Pause Serial Communication | | 8 | `Vcc` | Supply Voltage | --- ### 4. Part Number Decoder (M95320-RMB3P) The suffix provides critical information regarding the physical and electrical environment: * **M95**: Family (SPI Serial Access EEPROM) * **320**: Density (32 Kbit) * **-R**: Operating Voltage (1.8V to 5.5V) * **MB**: Package (UFDFPN8, 2x3mm) * **3**: Temperature Range (-40°C to +125°C / Automotive Grade 1 or High-End Industrial) * **P**: Sustainability (RoHS compliant, Halogen-free) ---