The **AD5246BKS5-R2** is a compact, digital potentiometer (digipot) manufactured by Analog Devices. It is designed to replace traditional mechanical potentiometers and variable resistors in space-constrained applications. --- ### ## Technical Specifications The table below summarizes the core technical parameters of the AD5246BKS5-R2: | Parameter | Specification | | :--- | :--- | | **Resistor Network** | 5 kΩ (End-to-end resistance) | | **Resolution** | 128 positions (7-bit) | | **Interface** | I²C-compatible serial interface | | **Supply Voltage** | 2.7 V to 5.5 V | | **Package** | 5-lead SC70 | | **Temperature Range** | -40°C to +125°C | | **Wiper Resistance** | 50 Ω (typical) | --- ### ## Key Electronic Components & Functions #### 1. Resistor String Architecture The device utilizes a string of 128 internal resistors connected in series. Switches (MOSFETs) are placed at each junction point. By selecting a specific switch via digital command, the "wiper" terminal connects to that specific point in the string, changing the resistance. #### 2. I²C Interface Logic The part contains a digital control logic block that interprets I²C signals. - **Address:** It has a hard-coded I²C address. - **Data Transfer:** It accepts a single byte of data to set the wiper position from 0 to 127. #### 3. Power-On Reset (POR) The AD5246 includes a Power-On Reset circuit. Upon initial power-up, the wiper is automatically set to the **mid-scale** position (position 64), ensuring a predictable state before the microcontroller sends the first command. --- ### ## Pin Configuration The SC70 package is extremely small, utilizing only 5 pins: 1. **VDD:** Positive power supply. 2. **GND:** Ground. 3. **SCL:** Serial clock input for I²C. 4. **SDA:** Serial data input/output for I²C. 5. **W:** Wiper terminal (the variable output). *Note: Unlike 3-terminal potentiometers, the AD5246 acts primarily as a variable resistor (rheostat) between the Wiper and the internal Ground/Reference.* --- ### ## Typical Application Circuit When integrating this part into a circuit, pull-up resistors are required for the I²C lines. ```cpp // Pseudocode for setting wiper to maximum resistance Wire.beginTransmission(AD5246_ADDRESS); Wire.write(0x7F); // Binary 01111111 (Position 127) Wire.endTransmission(); ```