## Technical Overview: M95320-RBN6G The **M95320-RBN6G** is a low-voltage, 32-Kbit serial SPI (Serial Peripheral Interface) EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. It is widely used for parameter storage, configuration data, and small-scale data logging in embedded systems. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbits (4096 x 8 bits) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | Up to 20 MHz (at 4.5V - 5.5V) | | **Page Size** | 32 Bytes | | **Write Cycle Time** | 5 ms (Maximum) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | PDIP8 (Plastic Dual In-line Package) | --- ### 2. Pin Configuration (PDIP8) The device typically follows the standard SPI EEPROM pinout: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S#** | Chip Select (Active Low) | | 2 | **Q** | Serial Data Output (MISO) | | 3 | **W#** | Write Control / Protect | | 4 | **Vss** | Ground | | 5 | **D** | Serial Data Input (MOSI) | | 6 | **C** | Serial Clock | | 7 | **HOLD#** | Pause Serial Communication | | 8 | **Vcc** | Supply Voltage | --- ### 3. Core Features * **SPI Protocol:** It uses a four-wire synchronous bus, allowing for high-speed data transfer compared to $I^2C$. * **Block Protection:** Users can software-write-protect portions of the memory array (Quarter, Half, or Entire memory) via the Status Register. * **Byte and Page Write:** Supports writing a single byte or a full page (32 bytes) in one cycle, improving efficiency. * **Low Power Consumption:** Optimized for battery-powered applications with low active and standby currents. * **Self-Timed Write Cycle:** Once a write command is sent, the chip manages the internal erasure and programming automatically. --- ### 4. Part Number Decoding (RBN6G) * **M95320:** 32 Kbit SPI EEPROM. * **-R:** Operating Voltage range of 1.8V to 5.5V. * **BN:** PDIP8 Package (Plastic Dual In-line). * **6:** Industrial Temperature range (-40°C to +85°C). * **G:** ECOPACK2 (RoHS compliant, Lead-free, Halogen-free). --- ### 5. Common Applications ```cpp // Example: Basic SPI Instruction Set for M95320 #define WREN 0x06 // Write Enable #define WRDI 0x04 // Write Disable #define RDSR 0x05 // Read Status Register #define WRSR 0x01 // Write Status Register #define READ 0x03 // Read from Memory #define WRITE 0x02 // Write to Memory ``` 1. **Consumer Electronics:** Storing user settings in smart home devices. 2. **Industrial:** Calibration data and error logs for sensors. 3. **Medical:** Patient settings or device usage history. 4. **Prototyping:** The PDIP8 package is breadboard-friendly, making it popular for Arduino/ESP32 development.