The **M95320-RMB3T** is a specific variant of the M95320 family, which consists of Electrically Erasable Programmable Read-Only Memory (EEPROM) devices. These are commonly used for parameter storage in embedded systems. --- ## 1. Device Overview The M95320-RMB3T is a **32-Kbit (4096 x 8 bits)** serial EEPROM. It is designed to interface with microcontrollers via the **SPI (Serial Peripheral Interface)** bus. ### Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4 KB) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | UFDFPN8 (MLP8) | | **Write Cycles** | 4 million cycles (approx.) | | **Data Retention** | 200 Years | --- ## 2. Part Number Breakdown (Decoding) The suffix **-RMB3T** provides specific details about the physical and electrical characteristics: * **M95320**: Base part number (32 Kbit SPI EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (Ultra-thin Fine pitch Dual Flat No-lead, 2x3 mm). * **3**: Temperature Range 3 (-40 to +125 °C), suitable for automotive or industrial use. * **T**: Tape and Reel packing. --- ## 3. Pin Configuration The device usually comes in an 8-pin layout. The standard SPI pinout functions are: | 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. Key Operational Features ### SPI Protocol The device operates using a set of standard instructions: * **WREN:** Set Write Enable Latch. * **READ:** Read data from memory. * **WRITE:** Write data to memory (supports Page Write up to 32 bytes). * **RDSR/WRSR:** Read/Write Status Register. ### Data Protection * **Hardware Protection:** Via the `W#` pin. * **Software Protection:** Users can configure "Block Protect" bits in the Status Register to make portions of the memory (Quarter, Half, or Whole) read-only. ---