The **M95640-RDL6TP** is a high-performance, electrically erasable programmable read-only memory (**EEPROM**) manufactured by STMicroelectronics. It is commonly used in automotive and industrial applications for non-volatile data storage. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Package Type** | MLP / DFN8 (2x3 mm) | | **Operating Temperature** | -40°C to +85°C | | **Write Cycles** | 4 million cycles (at 25°C) | | **Data Retention** | 200 Years | --- ## 2. Key Features and Functions ### SPI Protocol Support The device operates using the SPI bus protocol, supporting the four standard signals: * **S (Chip Select):** Activates the device. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Transfers data out of the device. * **C (Serial Clock):** Synchronizes data movement. ### Data Protection The M95640-RDL6TP includes several mechanisms to ensure data integrity: 1. **Write Protect (W):** A hardware pin to freeze the status register. 2. **HOLD Pin:** Allows the CPU to pause communication without deselecting the device. 3. **Software Protection:** Block protection bits in the Status Register allow the user to protect 1/4, 1/2, or the entire memory array. --- ## 3. Package and Ordering Information The "RDL6TP" suffix provides specific details about the physical implementation: * **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 to 85°C). * **TP:** Tape and Reel packaging. --- ## 4. Typical Application Circuit When integrating this part into a PCB design, the following connections are standard: ```c // Typical Pin Configuration for M95640 Pin 1: S (Chip Select) <-- Connected to MCU GPIO Pin 2: Q (Data Out) --> Connected to MCU MISO Pin 3: W (Write Prot) <-- Tied to VCC (if not used) Pin 4: VSS --- Ground Pin 5: D (Data In) <-- Connected to MCU MOSI Pin 6: C (Clock) <-- Connected to MCU SCK Pin 7: HOLD <-- Tied to VCC (if not used) Pin 8: VCC --- Power Supply (1.8V - 5.5V) ```