The **M95128-RMB3G/A** is a high-performance, high-reliability Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by STMicroelectronics. It is specifically designed for applications requiring robust non-volatile storage and low power consumption. --- ### ## 1. Key Technical Specifications The following table outlines the primary electrical and functional characteristics of this specific part: | Feature | Specification | | :--- | :--- | | **Memory Size** | 128 Kbit (16,384 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at VCC > 4.5V) | | **Supply Voltage (VCC)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 1) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### ## 2. Core Electronic Components & Architecture The device is composed of several internal blocks that manage data flow and storage: * **Memory Array:** Organized as 16,384 words of 8 bits each. * **SPI Control Logic:** Handles the communication protocol, supporting SPI modes 0 and 3. It manages commands like `READ`, `WRITE`, `WREN` (Write Enable), and `RDSR` (Read Status Register). * **Write Latches:** A 64-byte page buffer that allows for efficient "Page Write" operations, reducing the total programming time. * **Error Correction Code (ECC):** This specific series often includes internal hardware ECC to enhance reliability against single-bit failures. * **Status Register:** A volatile register used to monitor the progress of write operations and to set block protection (write-protection) settings. --- ### ## 3. Pinout Configuration The M95128-RMB3G/A typically utilizes an 8-pin layout: | Pin Name | Function | Description | | :--- | :--- | :--- | | **S** | Chip Select | Activates the device when pulled low. | | **D (MOSI)** | Serial Data In | Data input for instructions and addresses. | | **Q (MISO)** | Serial Data Out | Data output for read operations. | | **C (SCK)** | Serial Clock | Synchronizes data movement. | | **W** | Write Control | Hardware protection against unauthorized writes. | | **HOLD** | Hold | Pauses communication without resetting the chip. | | **VCC / VSS** | Power / Ground | Supply voltage and reference ground. | --- ### ## 4. Application Context The "R" in the part number indicates a high-reliability process, and the "3" indicates **Automotive Grade 1** qualification (AEC-Q100). **Common Uses:** * **Automotive:** Storing calibration data for ECUs, odometer readings, or crash event data. * **Industrial:** Configuration storage for PLCs and sensors operating in harsh thermal environments. * **Medical:** Devices requiring long-term data integrity and high write endurance.