The **M95320-RMB3TG/PC** is a specialized Serial Peripheral Interface (SPI) EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. It is designed for high-reliability applications, often found in automotive and industrial sectors. --- ## 1. Technical Specifications The following table outlines the core technical parameters of the device: | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage** | 1.8V to 5.5V | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +125°C | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ## 2. Pin Configuration The device typically uses an 8-pin layout. Below is the functional breakdown of the pins: * **S (Chip Select):** Activates the device when held low. * **D (Serial Data Input):** Used to transfer data/opcodes into the device. * **Q (Serial Data Output):** Used to read data out of the device. * **C (Serial Clock):** Provides the timing for data synchronization. * **W (Write Protect):** Hardware protection to prevent unauthorized write operations. * **HOLD:** Pauses serial communication without deselecting the device. * **Vcc/Vss:** Power supply and Ground pins. --- ## 3. Key Electronic Features ### A. Block Protection The device includes a **Status Register** that allows the user to software-protect sections of the memory (Quarter, Half, or Whole memory) against Write instructions. ### B. High Reliability Part of the "Automotive Grade" lineage (indicated by the /PC or similar suffixes in ST nomenclature), these chips are designed to withstand extreme thermal cycling and provide high electromagnetic compatibility (EMC) performance. ### C. Byte and Page Write * **Byte Write:** Allows modification of a single byte. * **Page Write:** Allows writing up to 32 bytes in a single instruction cycle, significantly improving throughput for large data sets. --- ## 4. Part Number Breakdown Understanding the specific suffix of **M95320-RMB3TG/PC**: * **M95:** SPI family of EEPROMs. * **320:** 32 Kbit density. * **R:** Operating voltage range (1.8V to 5.5V). * **MB:** Package code for UFDFPN8 (2x3 mm). * **3:** Range 3 temperature (-40 to +125°C). * **TG:** Tape & Reel packing. * **PC:** Often denotes a specific manufacturing process or automotive-grade qualification level. ---