The **M95128-RMB3TP/P** is a high-performance, electrically erasable programmable read-only memory (EEPROM) manufactured by **STMicroelectronics**. It is commonly used in automotive and industrial applications due to its reliability and high endurance. --- ### ## Technical Specifications | Parameter | Details | | :--- | :--- | | **Memory Size** | 128 Kbit (16,384 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### ## Key Features 1. **SPI Bus Compatibility:** It operates in SPI modes 0 and 3, allowing for high-speed data transfers using four signals: Chip Select ($\bar{S}$), Serial Clock (C), Serial Data Input (D), and Serial Data Output (Q). 2. **Byte and Page Write:** It supports byte-level writing and page-level writing (up to 64 bytes in a single cycle), which optimizes programming time. 3. **Write Protection:** Includes a hardware Write Protect ($\bar{W}$) pin and software-programmable block protection to prevent accidental data overwriting. 4. **Low Power Consumption:** Designed for energy-sensitive applications, featuring a deep power-down mode and low active currents. --- ### ## Pin Configuration (UFDFPN8) The device typically follows the standard 8-pin layout for SPI EEPROMs: | Pin | Name | Function | | :--- | :--- | :--- | | 1 | $\bar{S}$ | Chip Select (Active Low) | | 2 | Q | Serial Data Output | | 3 | $\bar{W}$ | Write Protect | | 4 | $V_{SS}$ | Ground | | 5 | D | Serial Data Input | | 6 | C | Serial Clock | | 7 | $\bar{HOLD}$ | Hold (Pauses communication) | | 8 | $V_{CC}$ | Supply Voltage | --- ### ## Programming Example (Generic SPI) To interact with this chip, a microcontroller would typically send an instruction byte followed by the 16-bit address. ```c // Example: Write Enable Instruction (0x06) void EEPROM_WriteEnable() { CS_Low(); // Pull Chip Select low SPI_Transfer(0x06); // Send WREN opcode CS_High(); // Release Chip Select } ``` ---