### M95320-RDL3G Overview The **M95320-RDL3G** is a high-performance **32-Kbit Serial SPI EEPROM** (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is widely used in automotive and industrial applications due to its reliability and low power consumption. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 1) | | **Package Type** | MLP / DFN8 (2x3 mm) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### Internal Electronic Components & Pins The device operates using a standard 4-wire SPI bus. Below is the functional breakdown of the pins: * **Chip Select ($\bar{S}$):** Activates the device when held low. * **Serial Data Input (D):** Receives instructions, addresses, and data. * **Serial Data Output (Q):** Transfers data out of the memory. * **Serial Clock (C):** Synchronizes data movement. * **Hold ($\bar{HOLD}$):** Pauses serial communication without deselecting the device. * **Write Protect ($\bar{W}$):** Provides hardware protection against unauthorized write operations. --- ### Operational Modes The M95320 supports the following SPI modes: 1. **Mode 0 (0,0):** Clock idle state is low. 2. **Mode 3 (1,1):** Clock idle state is high. #### Instruction Set Summary ```text WREN (0000 0110) - Set Write Enable Latch WRDI (0000 0100) - Reset Write Enable Latch RDSR (0000 0101) - Read Status Register WRSR (0001 0001) - Write Status Register READ (0000 0011) - Read Data from Memory WRITE (0000 0010) - Write Data to Memory ``` --- ### Applications * **Automotive:** Storing calibration data, odometer readings, and configuration settings in ECUs. * **Industrial:** Parameter storage in sensors and controllers. * **Consumer Electronics:** Firmware backup and configuration logs. ---