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Description
A digital potentiometer (often called digipot) is an electronic component that mimics the functions of analog potentiometers. Through digital input signals, the resistance between two terminals can be adjusted, just as in an analog potentiometer.
This is the X9C103S Digital Potentiometer Module which is ideal for Arduino.
This module is a digitally controlled (XDCP) potentiometer that consists of a resistor array, wiper switches, a control section, and non-volatile memory. 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 DC 3v-5v X9c103s Digital Potentiometer as the input control, counter and decode section, the non-volatile memory and the resistor array.
The output of the 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. 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 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 œmake-before-break mode when the wiper changes tap positions.
If the wiper is moved several positions, multiple taps are connected to the wiper for ITW (INC to VW/RW change). 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 last stored value. 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.
Digital potentiometers are commonly used to allow a Microcontroller to control the calibration or adjustment of a device rather than having a human twiddle a potentiometer knob. This can be done automatically such as in the case where the Microcontroller is monitoring a voltage using ADC and adjusting the pot to hit a target voltage or in response to user input such as to control the volume of an audio amplifier.
Features
Chip: X9C103S
Input Voltage: 3V ~ 5V
Resistance: 10K
Potentiometer center tap between the 0-10k slide in total 100 (potentiometer wiper typical impedance 40 ohms)
VL and VH digital potentiometer sliding rheostat port corresponding to the low-end and high-end, allowing the input voltage range -5V to + 5V.
Interface: SPI
Pin Number: 8 Pins
Size: 27mm x 13mm