The **24VL024HT/ST** is a specific variant of a serial Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by **Microchip Technology**. It is designed for low-power and low-voltage applications. --- ## 1. Technical Specifications The part number reveals specific details about the device's architecture and packaging: | Feature | Specification | |:---|:---| | **Memory Size** | 2 Kbit (organized as 256 x 8-bit) | | **Interface** | I²C™ (2-wire serial) | | **Operating Voltage** | 1.5V to 3.6V (Ultra-low voltage) | | **Clock Frequency** | 400 kHz (max) | | **Package Type** | SOT-23 (indicated by the /ST suffix) | | **Temperature Range** | High temperature/Industrial (-40°C to +125°C) | | **Write Cycles** | 1,000,000 erase/write cycles | | **Data Retention** | > 200 Years | --- ## 2. Key Features and Functions ### A. I²C Communication The device utilizes a standard 2-wire bus protocol. It acts as a **slave** device on the bus, requiring a Master (like a microcontroller) to initiate data transfers using a Start condition, Device Address, and Register Address. ### B. Hardware Write Protection The "H" in the part number often signifies specific hardware features. In many Microchip EEPROMs, this includes a **Write-Protect (WP)** pin that, when connected to VCC, prevents any write operations to the memory array, ensuring data integrity. ### C. Low Power Consumption This specific "VL" (Very Low voltage) series is optimized for battery-powered devices. * **Read current:** 400 µA (Typical) * **Standby current:** 100 nA (Typical) --- ## 3. Pinout Configuration (SOT-23) The /ST suffix usually corresponds to a 6-lead SOT-23 package. | Pin Number | Name | Function | |:---:|:---:|:---| | 1 | **SCL** | Serial Clock Input | | 2 | **VSS** | Ground | | 3 | **SDA** | Serial Data (Bi-directional) | | 4 | **WP** | Write-Protect Pin | | 5 | **VCC** | Power Supply (1.5V - 3.6V) | | 6 | **NC/A0** | No Connection or Address Input | --- ## 4. Usage Example To interface this part with an Arduino or similar microcontroller, you would typically use the `Wire.h` library. ```cpp #include #define EEPROM_ADDR 0x50 // Base I2C address for 24VL024 void setup() { Wire.begin(); // Example: Write the value 100 to memory address 0x05 Wire.beginTransmission(EEPROM_ADDR); Wire.write(0x05); // Register address Wire.write(100); // Data byte Wire.endTransmission(); delay(5); // Wait for internal write cycle } ``` ---