### M24C02-RDS3T Overview The **M24C02-RDS3T** is a 2-Kbit serial I²C (Inter-Integrated Circuit) EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is widely used for non-volatile data storage in consumer electronics and industrial applications. --- ### Technical Specifications The following table summarizes the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 2 Kbit (256 bytes x 8 bits) | | **Interface** | I²C Serial (Two-wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) | | **Package Type** | TSSOP8 (Thin Shrink Small Outline Package) | | **Temperature Range** | -40°C to +125°C (Grade 3) | | **Write Cycles** | 4 Million cycles | | **Data Retention** | 200 Years | | **Write Time** | 5 ms (Byte or Page Write) | --- ### Pin Configuration (TSSOP8) The device uses a standard 8-pin layout common to most I²C EEPROMs. 1. **E0, E1, E2 (Pins 1, 2, 3):** Chip Enable inputs. Used to define the device address on the I²C bus, allowing up to eight M24C02 devices to be connected to the same bus. 2. **VSS (Pin 4):** Ground. 3. **SDA (Pin 5):** Serial Data. This is a bidirectional pin used to transfer addresses and data into and out of the device. 4. **SCL (Pin 6):** Serial Clock. Used to synchronize all data transfers. 5. **WC (Pin 7):** Write Control. When connected to VCC, write operations are disabled (Read-only). When connected to VSS, write operations are enabled. 6. **VCC (Pin 8):** Supply Voltage. --- ### Key Features and Functionality #### 1. I²C Protocol The device operates as a slave on the I²C bus. It requires a specific 8-bit device code (`1010` for memory access) followed by the hardware address (E2, E1, E0) and a Read/Write bit. #### 2. Byte and Page Writing * **Byte Write:** The master sends the address and one byte of data. * **Page Write:** The device allows up to 16 bytes to be written in a single write cycle, significantly improving efficiency for bulk data storage. #### 3. Data Protection The **WC (Write Control)** pin provides hardware-level data protection. If the pin is pulled high, the entire memory becomes write-protected, preventing accidental data corruption or unauthorized changes. #### 4. Low Power Consumption The "RDS" variant is optimized for low power, making it suitable for battery-operated devices. It features a very low standby current. --- ### Common Applications * **Device Configuration:** Storing setup parameters, calibration data, or serial numbers. * **User Settings:** Saving user preferences in appliances or smart home devices. * **Firmware Metadata:** Storing version info or bootloader flags.