Digital Potentiometer Board Module

Digital Potentiometer Board Module

This is a X9C103S DC 3-5V Digital Potentiometer Board Module for Arduino. The X9C103 is a digitally controlled (XDCP) potentiometer. It consists of a resistor array, wiper switch, control section and non-volatile memory. Wiper position is controlled via a 3-wire interface. The potentiometer is implemented by a resistor array consisting of 99 resistive elements and a wiper switching network. Between each element and at each end there are tap points that can be accessed for wiper connections. The wiper element position is controlled by the CS, U/D, and INC inputs. The wiper position can be saved in non-volatile memory and recalled on subsequent power ups.

DC3V-5V X9c103S digital potentiometer has his three sections: Input control, counter and decoding section. non-volatile memory; and resistor arrays.

The input control section works exactly like an up/down counter. The output of this counter is decoded to turn on a single electronic switch that connects a point on the register array to the wiper output. Under proper conditions, the contents of the counter can be saved in non-volatile memory and saved for future use. The resistor array consists of 99 individual resistors connected in series. Between the ends of the array and each resistor there is an electronic switch that transfers the potential at that point to the wiper.
The wiper behaves like a mechanical equivalent at one of the fixed terminals and does not move beyond its final position. This means that the counter will not jump when clocked to either extreme. The device's electronic switches operate in a make-before-break mode as the wiper changes tap positions. When the wiper moves to multiple positions, multiple taps are connected to the wiper during tIW (INC to VW/RW switching). Moving the wiper to multiple positions can temporarily significantly reduce the overall value of the device. When the unit is turned off, the last saved wiper position is retained in non-volatile memory. When power returns, the memory contents are recalled and the wipers are reset to their last saved values. An internal charge pump allows a wide voltage range (-5V to 5V) to be applied to his XDCP pin while maintaining the convenience of a single supply. A typical charge pump noise of 20 mV at 850 kHz should be considered when designing the application circuit.

The digital potentiometer module is accompanied by a test program. The program code is C language code and is written in sub-modules. The code includes: main function, display sub-function, button sub-function and header file of each module. You can use KEIL4 to open the source code for testing and learning. The digital potentiometer VL and ports correspond to the low and high end of the sliding rheostat, respectively, allowing the input voltage range from -5V to +5V.

Features:

• Digitally Controlled Resistance: Allows precise adjustment of resistance via a microcontroller.
  
• Three-Wire Interface: Uses a simple three-wire interface for control.
  
• Non-Volatile Memory: Retains the last resistance setting even after power is removed.
  
• 99 Resistance Steps: Provides 99 discrete resistance levels for fine-tuning.
  
• Compact Size: Small form factor suitable for various embedded applications.
  
• Wide Operating Voltage: Typically operates between 3V to 5V.

Applications:

• LED Dimming: Adjusts the brightness of LEDs in lighting applications.
  
• Audio Volume Control: Used in audio equipment for digital volume adjustment.
  
• Sensor Calibration: Helps in calibrating sensors by adjusting resistance values.
  
• Closed-Loop Gain Control: Used in feedback systems to control gain.
  
• Wheatstone Bridge Trims: Adjust resistance in Wheatstone bridge circuits for precise measurements.
  
• Current Source Control: Regulates current in various electronic circuits.
  
• Programmable Analog Filters: Tunes filters in analog signal processing.
  
• Automotive Electronics: Used in automotive systems for level adjustments.