The **M95320-RBN3G** is a high-performance, electrically erasable programmable read-only memory (**EEPROM**) manufactured by STMicroelectronics. It is commonly used for data logging, configuration storage, and parameter settings in embedded systems. --- ## 1. Technical Specifications Below are the primary technical parameters for the M95320-RBN3G: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | PDIP8 (Plastic Dual In-line Package) | | **Write Cycles** | 4 Million cycles (typical) | | **Data Retention** | 200 Years | --- ## 2. Pin Configuration (PDIP8) The device uses a standard 8-pin layout for SPI communication: | Pin Number | 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#** | Hold (Suspends communication) | | 8 | **Vcc** | Supply Voltage | --- ## 3. Key Operational Features * **SPI Modes:** Supports SPI Bus Modes 0 (0,0) and 3 (1,1). * **Block Protection:** Features a Write Guard strategy where a portion (or all) of the memory array can be software-protected against write instructions. * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in one cycle. * **Self-Timed Write Cycle:** The internal write cycle is self-timed, typically taking around 5ms. * **ESD Protection:** Enhanced Electrostatic Discharge protection (up to 4000V Human Body Model). --- ## 4. Part Number Breakdown The suffix **RBN3G** provides specific manufacturing details: * **R**: Operating voltage range (1.8V to 5.5V). * **BN**: Package type (PDIP8). * **3**: Temperature range (-40°C to +125°C). * **G**: ECOPACK2 (RoHS compliant/Green). --- ## 5. Typical Application Circuit When connecting this EEPROM to a microcontroller (MCU), pull-up resistors are typically recommended on the **S#** and **HOLD#** lines to prevent floating states during MCU reset. ```cpp // Example: Arduino SPI Initialization for M95320 #include const int CS_PIN = 10; void setup() { pinMode(CS_PIN, OUTPUT); digitalWrite(CS_PIN, HIGH); SPI.begin(); // M95320 supports high speed, but start lower for stability SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0)); } ```