## AD5247BKS10-R2: Electronic Component Overview The **AD5247BKS10-R2** is a high-resolution, I2C-compatible **Digital Potentiometer** (DigiPOT) manufactured by Analog Devices. It is designed to replace mechanical potentiometers in electronic circuits for precise, automated adjustments. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Resistance** | 10 kΩ | | **Number of Steps** | 128 Positions (7-bit) | | **Interface** | I2C Serial Interface | | **Supply Voltage (VDD)** | 2.7 V to 5.5 V | | **Package Type** | 6-Lead SC70 | | **Temperature Range** | -40°C to +125°C | | **Wiper Resistance** | 50 Ω (typical) | --- ### 2. Functional Description The AD5247 acts as a variable resistor or a voltage divider. Unlike a mechanical knob, its resistance value is controlled by sending digital data over the **I2C bus**. #### Internal Architecture - **Resistor String:** A series of 128 resistors connected in a chain. - **Wiper (W):** A digital switch that connects to any node along the resistor string based on the binary value stored in the RDAC register. - **Terminals (A, B):** The fixed ends of the resistor string. --- ### 3. Pin Configuration (SC70-6) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **VDD** | Positive Power Supply | | 2 | **GND** | Ground | | 3 | **SCL** | Serial Clock Input (I2C) | | 4 | **SDA** | Serial Data Input/Output (I2C) | | 5 | **W** | Wiper Terminal (Variable output) | | 6 | **B** | Bottom Terminal of Resistor | *Note: In the AD5247, Terminal A is internally connected to VDD to save pin space in the small SC70 package.* --- ### 4. Common Applications 1. **LCD Contrast Control:** Adjusting the bias voltage for displays. 2. **Programmable Filters/Amplifiers:** Changing the gain of an Op-Amp by placing the DigiPOT in the feedback loop. 3. **Sensor Calibration:** Fine-tuning the offset or sensitivity of sensors. 4. **Power Supply Adjustment:** Controlling the output voltage of DC-DC converters. --- ### 5. Implementation Example (Conceptual) To set the resistance via I2C, a microcontroller sends a command byte followed by the data byte (0 to 127). ```cpp // Pseudocode for setting AD5247 to mid-scale (5k ohms) I2C.beginTransmission(0x2E); // Standard 7-bit I2C address I2C.write(0x00); // Instruction byte I2C.write(64); // 64 is mid-way for 128 steps I2C.endTransmission(); ``` ---