The **M95320-RMB3TG** is a specific variant of the 32-Kbit serial SPI (Serial Peripheral Interface) EEPROM manufactured by **STMicroelectronics**. It is designed for high-reliability applications, often found in automotive and industrial sectors. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics: | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4096 x 8 bits) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Max Clock Frequency** | 20 MHz (at VCC > 4.5V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +125°C | | **Write Endurance** | 4 Million cycles | | **Data Retention** | 200 Years | --- ### ## Key Electronic Components & Features The device architecture consists of several critical internal blocks: ### 1. SPI Interface Logic The chip uses a 4-wire interface consisting of: * **S (Chip Select):** Activates the device. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Sends data back to the host. * **C (Serial Clock):** Synchronizes data movement. ### 2. Status Register A non-volatile register that allows the user to: * Check if a "Write" cycle is in progress (WIP bit). * Enable or disable the Write Enable Latch (WEL). * Configure Block Protection (BP bits) to prevent accidental overwriting of memory sectors. ### 3. Write Protection (W#) & Hold (HOLD#) * **Hardware Write Protect:** When the `W#` pin is low, the status register becomes read-only, preventing changes to the memory protection settings. * **Hold Function:** The `HOLD#` pin allows the communication to be paused without deselecting the device, which is useful when sharing the SPI bus with other peripherals. ### 4. Memory Array Management The 32-Kbit memory is organized into **pages of 32 bytes**. During a write operation, up to 32 bytes can be written in a single instruction cycle, provided they reside on the same page. --- ### ## Package Breakdown: "RMB3TG" The suffix provides specific manufacturing details: * **R:** Range of voltage (1.8V to 5.5V). * **MB:** Package code for **UFDFPN8** (2x3 mm). * **3:** Temperature range 3 (-40°C to +125°C). * **TG:** Tape & Reel packing with "Green" (RoHS compliant) materials.