The **M95640-RDL6** is a high-performance serial SPI (Serial Peripheral Interface) EEPROM manufactured by STMicroelectronics. It is commonly used for non-volatile data storage in industrial and consumer electronics. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | Up to 20 MHz (at 4.5V - 5.5V) | | **Package Type** | UFDFPN8 (MLP8) - 2x3 mm | | **Temperature Range** | -40°C to +85°C | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### 2. Pin Configuration (UFDFPN8) The device typically follows a standard SPI pinout for 8-pin packages: 1. **S# (Chip Select):** Activates the device when pulled low. 2. **Q (Serial Data Output):** Data is shifted out on the falling edge of the clock. 3. **W# (Write Protect):** Hardware protection against write operations. 4. **Vss:** Ground. 5. **D (Serial Data Input):** Commands and data are shifted in on the rising edge of the clock. 6. **C (Serial Clock):** Provides the timing for data synchronization. 7. **HOLD# (Hold):** Pauses serial communication without deselecting the device. 8. **Vcc:** Supply voltage. --- ### 3. Core Functional Features * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single cycle. * **Write Protection:** * **Software Protection:** Via a status register (Block Protect bits). * **Hardware Protection:** Using the `W#` pin to prevent changes to the status register. * **Low Power Consumption:** Optimized for battery-powered devices with low standby current (typically < 2µA at 1.8V). * **High-Speed Communication:** The 20 MHz clock speed allows for rapid data retrieval, essential for boot-loading applications. --- ### 4. Part Number Breakdown (M95640-RDL6) Understanding the suffix helps in sourcing and design: * **M95:** SPI family of EEPROMs. * **640:** 64 Kbit density. * **-R:** Operating voltage range (1.8V to 5.5V). * **DL:** Package code for **UFDFPN8** (Ultra-thin Fine pitch Dual Flat No-lead). * **6:** Industrial temperature range (-40°C to 85°C). --- ### 5. Implementation Example To read data from the M95640 using an MCU (like Arduino or STM32), the following SPI command structure is used: ```c // Standard SPI Instruction Set #define WREN 0x06 // Write Enable #define WRDI 0x04 // Write Disable #define RDSR 0x05 // Read Status Register #define READ 0x03 // Read Data from Memory #define WRITE 0x02 // Write Data to Memory ```