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This is DC 3-5V X9C103S Digital Potentiometer Board Module for Arduino. The X9C103 module is digitally controlled (XDCP) potentiometers. This Arduino potentiometer module consists of a resistor array, wiper switches, a control section, and non-volatile memory. The wiper position is controlled by a three-wire interface. The potentiometer is implemented by a resistor array composed of 99 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal.
The position of the wiper element is controlled by the CS, U/D, and INC inputs. The position of the wiper can be stored in non-volatile memory and then be recalled upon a subsequent power-up operation.
There are three sections of the Dc3v-5v X9c103s digital potentiometer as the input control, counter, and decode section; the non-volatile memory; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. Under the proper conditions, the contents of the counter can be stored in non-volatile memory and retained for future use. The resistor array is comprised of 99 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper.
The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. The electronic switches on the device operate in a “make-before-break” mode when the wiper changes tap positions. If the wiper is moved several positions, multiple taps are connected to the wiper for tIW (INC to VW/RW change). The TOTAL value of the device can temporarily be reduced by a significant amount if the wiper is moved to several positions. When the device is powered-down, the last wiper position stored will be maintained in the non-volatile memory.
When power is restored, the contents of the memory are recalled and the wiper is reset to the value last stored. The internal charge pump allows a wide range of voltages (from -5V to 5V) applied to XDCP terminals yet given the convenience of the single power supply. The typical charge pump noise of 20mV at 850kHz should be taken into consideration when designing an application circuit.
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