The **M95320-RDL6TG** is a specific variant of the 32-Kbit serial SPI (Serial Peripheral Interface) EEPROM manufactured by **STMicroelectronics**. It is widely used for parameter storage, configuration data, and small data logging in embedded systems. --- ## 1. Core Technical Specifications The part number encodes specific characteristics regarding its capacity, voltage, and packaging. | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes x 8 bits) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Clock Frequency** | Up to 20 MHz (at 4.5V - 5.5V) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V ("R" designation) | | **Package Type** | MLP / DFN8 (2x3 mm) | | **Operating Temperature** | -40°C to +85°C | | **Write Cycles** | 4 Million cycles (typical) | | **Data Retention** | 200 Years | --- ## 2. Key Electronic Features ### A. Hardware Protection The device includes physical pins to prevent accidental data loss: * **Write Protect ($\overline{W}$):** When held low, it prevents write operations to the status register. * **Hold ($\overline{HOLD}$):** Allows the microcontroller to pause communication without deselecting the device (useful when sharing the SPI bus). ### B. Memory Organization The 32 Kbits are organized as **4,096 bytes**. Data is written in "Pages": * **Page Size:** 32 bytes. * **Note:** If you write more than 32 bytes in a single instruction, the address rolls over to the beginning of the current page. ### C. Low Power Consumption Designed for battery-operated devices, it features: * **Standby Current:** Less than 2 µA (at 1.8V). * **Read Current:** 2 mA (at 5 MHz). --- ## 3. Part Number Breakdown: M95320-RDL6TG Understanding the suffix is critical for PCB design and procurement: | Segment | Meaning | | :--- | :--- | | **M95** | Family: SPI Serial Access EEPROM | | **320** | Density: 32 Kbit | | **-R** | Operating Voltage: 1.8V to 5.5V | | **DL** | Package: MLP8 / DFN8 (2x3mm, ultra-thin) | | **6** | Temperature: Industrial (-40°C to 85°C) | | **TG** | Packing: Tape & Reel / Green (RoHS compliant) | --- ## 4. Typical Application Circuit When integrating this part into a circuit, ensure the following connections: ```text (MCU) (M95320-R) SCK ------> Serial Clock (Pin 6) MOSI ------> Data In (Pin 5) MISO <------ Data Out (Pin 2) CS ------> Chip Select (Pin 1) VCC ------> 1.8V - 5.5V GND ------> Ground ``` * **Pull-up Resistors:** It is recommended to place a pull-up resistor (10kΩ) on the Chip Select ($\overline{S}$) line to ensure the chip is disabled during the MCU's power-up phase. ---