The **M24C02-RMB3TG/W** is a specific variant of the common 2-Kbit serial I2C EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. ### 1. Technical Specifications The table below summarizes the core electrical and physical parameters: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 2 Kbit (256 bytes x 8 bits) | | **Interface** | I2C (Two-Wire Serial) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode), 1 MHz (Fast Mode Plus) | | **Package Type** | UFDFPN8 (Ultra-Thin Fine Pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +125°C | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### 2. Part Number Breakdown The suffix code provides critical information about the packaging and grade: * **M24C02**: Base series (I2C EEPROM, 2 Kbit). * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (2x3 mm). * **3**: Temperature range 3 (-40°C to +125°C), often used in high-reliability or automotive-adjacent applications. * **TG**: Tape & Reel packing with Green/RoHS compliance. * **W**: Indicates the process technology/wafer variant (often specific to internal ST manufacturing enhancements). --- ### 3. Key Functional Features #### I2C Interface The device operates as a slave on the I2C bus. It requires a **Serial Clock (SCL)** and a **Serial Data (SDA)** line. It supports hardware addressing, allowing up to eight M24C02 devices to be connected to the same bus using three chip-enable pins (E0, E1, E2). #### Write Protection (WC) The **Write Control (WC)** pin provides hardware data protection: * If WC is tied to **Vcc**, the entire memory contents become write-protected (read-only). * If WC is tied to **GND**, the write operations are enabled. #### Memory Organization The 2048 bits are organized as 256 bytes. It supports: * **Byte Write**: Writing a single byte. * **Page Write**: Writing up to 16 bytes in a single instruction cycle. --- ### 4. Typical Application Circuit ```cpp // Logic representation of I2C connection [Microcontroller] [M24C02-R] SDA <--------------> SDA (Pin 5) SCL ---------------> SCL (Pin 6) GND ---------------| E0, E1, E2 (Pins 1, 2, 3 - Address 0x00) VCC ---------------> VCC (Pin 8) GND ---------------> WC (Pin 7 - Write Enabled) ```