The **M24C64-RMB6P** is a specific variant of the 64-Kbit serial I2C Bus EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Key Technical Specifications The "RMB6P" suffix identifies the voltage range, package type, and temperature grade. | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | I2C (Serial 2-Wire) | | **Operating Voltage ($V_{CC}$)** | 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 +85°C | | **Write Cycles** | 4 million cycles (at 25°C) | | **Data Retention** | 200 Years | --- ### 2. Pin Configuration (UFDFPN8) The device typically follows the standard 8-pin EEPROM pinout: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1, 2, 3 | E0, E1, E2 | Chip Enable inputs (used to address multiple devices on the same bus) | | 4 | $V_{SS}$ | Ground | | 5 | SDA | Serial Data (Bidirectional) | | 6 | SCL | Serial Clock | | 7 | WC | Write Control (Hardware Write Protection) | | 8 | $V_{CC}$ | Supply Voltage | --- ### 3. Core Functional Features * **I2C Protocol:** It operates as a slave device. It requires a start condition, an 8-bit device select code (usually `1010xxx`), and generates an acknowledge bit after each byte. * **Write Protection (WC Pin):** * If tied to $V_{CC}$, the entire memory is write-protected (Read-only). * If tied to $V_{SS}$, the memory can be written to. * **Page Write Mode:** It supports writing up to **32 bytes** in a single write instruction, significantly speeding up data storage compared to byte-by-byte writing. * **Random and Sequential Read:** Supports reading from a specific address or streaming data sequentially across the entire memory map. --- ### 4. Part Number Decoder (RMB6P) Understanding the suffix helps in sourcing and PCB design: * **R:** Operating voltage range of **1.8V to 5.5V**. * **MB:** Package code for **UFDFPN8** (2x3 mm). This is a very small, leadless surface-mount package. * **6:** Industrial temperature range (**-40 to +85°C**). * **P:** Denotes **RoHS compliant** and Halogen-free (Green) packaging. --- ### 5. Application Circuit Example To interface this with a microcontroller (like an Arduino or STM32), follow this logic: ```c // Example pseudo-code for a Write Operation 1. Start Condition 2. Send Device Address (0xA0) + Write Bit 3. Send High Address Byte (0x00) 4. Send Low Address Byte (0x01) 5. Send Data Byte (0x55) 6. Stop Condition 7. Wait for Internal Write Cycle (max 5ms) ```