## M24C32-RBN3TP Technical Overview The **M24C32-RBN3TP** is a high-performance, 32-Kbit (4096 x 8 bits) serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It is manufactured by STMicroelectronics and utilizes the $I^2C$ (Inter-Integrated Circuit) bus protocol. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4 KB) | | **Organization** | 4,096 words × 8 bits | | **Interface** | $I^2C$ (Two-wire) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) / 1 MHz (Fast Mode Plus) | | **Package Type** | PDIP8 (Plastic Dual In-line Package) | | **Temperature Range** | -40°C to +125°C | | **Write Cycles** | 4 Million cycles (Endurance) | | **Data Retention** | 200 Years | --- ### 2. Functional Description The device operates as a slave in the $I^2C$ protocol. It supports a wide supply voltage range, making it ideal for both low-power battery-operated devices and standard 5V industrial systems. #### Pin Configuration The M24C32-RBN3TP typically features 8 pins: * **E0, E1, E2:** Chip Enable inputs (used to set the device address and allow up to 8 devices on the same bus). * **SDA:** Serial Data (Bidirectional). * **SCL:** Serial Clock. * **WC:** Write Control (Hardware protection; if connected to $V_{CC}$, write operations are inhibited). * **$V_{CC}$ / $V_{SS}$:** Power supply and Ground. --- ### 3. Operating Features #### Write Operations The device supports two types of write modes: 1. **Byte Write:** Writing a single 8-bit byte to a specific address. 2. **Page Write:** Writing up to 32 bytes in a single instruction, provided they are within the same page boundary. #### Read Operations It supports: * **Current Address Read:** Reads the byte at the current internal address counter. * **Random Address Read:** Reads a byte from a specific user-defined address. * **Sequential Read:** Reads a stream of data by auto-incrementing the address. --- ### 4. Code Example (Pseudo-code for $I^2C$ Initialization) The following example demonstrates how a microcontroller might address the M24C32 using a standard library: ```c // Define the 7-bit I2C address (A0, A1, A2 tied to Ground) #define M24C32_ADDR 0x50 void writeEEPROM(uint16_t memAddress, uint8_t data) { I2C_Start(); I2C_SendAddress(M24C32_ADDR << 1 | 0); // Write mode I2C_SendData((uint8_t)(memAddress >> 8)); // MSB of address I2C_SendData((uint8_t)(memAddress & 0xFF)); // LSB of address I2C_SendData(data); I2C_Stop(); delay(5); // Wait for internal write cycle (tW) } ```