The **M24C01-RMB6TG** (often noted with suffix variations like /W) is a 1-Kbit serial I2C bus EEPROM (Electrically Erasable Programmable Memory). It is manufactured by STMicroelectronics and is designed for low-power, low-voltage applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (128 bytes x 8 bits) | | **Interface** | I2C (Two-Wire Serial) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode), 100 kHz (Standard) | | **Package Type** | UFDFPN8 (MLP8) - 2x3 mm | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | | **Write Time** | 5 ms (Byte or Page Write) | --- ### 2. Pin Configuration (UFDFPN8) The device typically uses an 8-pin layout. Below is the functional description: | Pin | Name | Type | Description | | :--- | :--- | :--- | :--- | | 1-3 | E0, E1, E2 | Input | Chip Enable (Address inputs to define I2C ID) | | 4 | Vss | Ground | 0V Reference | | 5 | SDA | I/O | Serial Data (Open-drain) | | 6 | SCL | Input | Serial Clock | | 7 | WC | Input | Write Control (Hardware Write Protection) | | 8 | Vcc | Power | Supply Voltage | --- ### 3. Core Functional Features #### A. Write Protection (WC Pin) The **WC** (Write Control) pin provides hardware protection. - If connected to **Vcc**, the entire memory is write-protected (read-only mode). - If connected to **Vss** (Ground), the write operations are enabled. #### B. Byte and Page Write The device supports both single-byte writing and **Page Write** (up to 8 bytes). Page writing is significantly more efficient as it reduces the overhead of sending the device address for every byte. #### C. The "/W" Suffix Meaning In STMicroelectronics nomenclature, the `/W` usually refers to a **specific process technology** or a variation in the manufacturing line (often involving the 180nm process) that ensures high reliability and specific voltage performance characteristics. --- ### 4. Typical Application Circuit To interface this chip with a microcontroller, pull-up resistors are required on the I2C lines: ```cpp // Typical I2C Pull-up values: // 4.7k Ohms for 100kHz // 2.2k Ohms for 400kHz [MCU] <----SDA----> [M24C01 Pin 5] (Pull-up to Vcc) [MCU] <----SCL----> [M24C01 Pin 6] (Pull-up to Vcc) ``` ---