The **M95320-RMB3P/PC** is a specific variant of the M95320 series, which is a high-performance **32-Kbit Serial SPI Bus EEPROM** (Electrically Erasable Programmable Read-Only Memory). It is manufactured by STMicroelectronics. --- ### 1. General Specifications This device is designed for non-volatile data storage where high reliability and byte-level flexibility are required. | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 10 MHz (20 MHz in newer versions) | | **Operating Voltage** | 1.8V to 5.5V (indicated by the "-R" suffix) | | **Operating Temp** | -40°C to +125°C (Automotive Grade 1 equivalent) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | --- ### 2. Part Number Breakdown (M95320-RMB3P/PC) To understand the electronic capabilities, we must decode the suffix: * **M95320**: Base Part Number (32 Kbit SPI EEPROM). * **-R**: Range of voltage (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (2x3 mm). * **3**: Temperature range (-40 to +125 °C). * **P or G**: RoHS compliant / Halogen-free. * **PC**: Often refers to "Process Code" or specific factory programming/packaging variations (e.g., Tape & Reel). --- ### 3. Key Electronic Features * **SPI Modes**: Supports SPI Bus Modes 0 and 3. * **Write Protection**: * **Hardware Protection**: Using the Write Protect ($\overline{W}$) pin. * **Software Protection**: Configurable via the Status Register (Block protection). * **High Endurance**: * **4 Million write cycles**: Extremely high durability for frequent data logging. * **200 Years data retention**: Reliable for long-term storage. * **Byte/Page Write**: Allows writing a single byte or a full page (up to 32 bytes) in one cycle. --- ### 4. Pin Configuration (UFDFPN8) The device typically follows the standard SPI EEPROM pinout: | Pin | Name | Description | | :--- | :--- | :--- | | 1 | $\overline{S}$ | Chip Select (Active Low) | | 2 | Q | Serial Data Output (MISO) | | 3 | $\overline{W}$ | Write Protect | | 4 | $V_{SS}$ | Ground | | 5 | D | Serial Data Input (MOSI) | | 6 | C | Serial Clock | | 7 | $\overline{HOLD}$ | Pause Serial Communication | | 8 | $V_{CC}$ | Supply Voltage | --- ### 5. Common Applications * **Automotive Systems**: Storing calibration data and odometer readings. * **Consumer Electronics**: Storing user settings and configuration parameters. * **Industrial**: Parameter storage for sensors and motor controllers.