The **AD5247BKS100-R2** is a compact, high-resolution digital potentiometer manufactured by Analog Devices. It is designed to replace mechanical potentiometers in space-constrained applications, providing digital control over resistance levels via a micro-controller. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Resistor Type** | Volatile Digital Potentiometer | | **Resistance Value** | 100 kΩ | | **Resolution** | 128 Taps (7-bit) | | **Interface** | I²C Serial Interface | | **Supply Voltage** | 2.7 V to 5.5 V | | **Package** | 6-lead SC70 | | **Temperature Range** | -40°C to +125°C | --- ### 2. Functional Components The internal architecture of the AD5247 consists of three primary sections: 1. **I²C Interface & Logic**: This section handles communication with the host processor. It receives 7-bit data bytes that determine the position of the "wiper." 2. **Resistor Ladder**: A string of 128 individual resistive elements connected in series. The total nominal resistance across the string is 100 kΩ. 3. **Wiper Switches**: CMOS switches that connect the output terminal (W) to one of the tap points along the resistor ladder based on the digital input. --- ### 3. Pin Configuration | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | **W** | Wiper terminal (analog output) | | 2 | **GND** | Ground | | 3 | **SCL** | Serial Clock Input (I²C) | | 4 | **SDA** | Serial Data Input/Output (I²C) | | 5 | **VDD** | Positive Power Supply | | 6 | **B** | Bottom terminal of the resistor | *Note: The AD5247 is a "rheostat" configuration device, meaning it typically connects between the Wiper and the B terminal.* --- ### 4. Application Use Cases * **LCD Contrast Control**: Adjusting the bias voltage for displays. * **Programmable Filters**: Changing the cutoff frequency of analog filters. * **Gain Control**: Used in the feedback loop of Operational Amplifiers (Op-Amps) to set digital gain. * **Sensor Calibration**: Fine-tuning bridge sensors or offset voltages in precision circuits. --- ### 5. Implementation Example (Pseudo-Code) To set the resistance via I²C, the controller sends the device address followed by the instruction byte. ```python # Example: Setting the wiper to mid-scale (value 64) # Device Address for AD5247 is typically 0x2E (check datasheet for specific model suffix) I2C_Write(Address: 0x2E, Data: 0x40) ```