Digital potentiometers are a three terminal device, two fixed end terminals and one wiper terminal which is used to vary the resistance. The mechanical potentiometer is a threeterminal physical device while the electronic pot is at minimum an eightterminal integrated circuit. How to build a digital potentiometer circuit with a mcp41. Global digital potentiometer ic market by manufacturers. In some applications it is required to control a digital potentiometer that has an i2c interface, with a continuously varying analog signal. The mcp4xxx digital potentiometer daughter board allows the system designer to quickly evaluate the operation of microchip technology s mcp42xxx and mcp402x digital potentiometers. Midi will be smooth with a capacitor on the dac or pwm control voltage.
Ds1804 datasheet pdf digital potentiometer, ds1804 datasheet, ds1804 pdf, pinout, data, circuit, ic, manual, substitute, parts, schematic, equivalent. The mcp41010 is a singlechannel, 8bit digital potentiometer features 10k. Digital potentiometer ic market 2020 aiming on regional. Features single element 256position linear taper potentiometer supports potentiometer terminal working voltages up to 11v potentiometer terminal voltage independent of supply voltage potentiometer wiper position controlled and read over, resistor recommendations. How to use digital potentiometers to control light and. Ds1844 quad digital potentiometer maxim integrated. The principle can be applied for controlling any device with an i2c interface using an analog voltage, and hence can be used in various applications.
Singledual digital potentiometer with spi interface microchip. The mcp41xxx is a singlechannel device and is offered in an 8pin pdip or soic package. Addressable dual digital potentiomete maxim integrated. Renesas electronics america inc rochester electronics, llc texas. Ibs is an authorized distributor for many digital potentiometer ics manufacturers. The mcp42xxx are dual digital potentiometer devices that have the same characteristics as their single digital potentiometer devices mcp41xxx. The mcp42xxx contains two independent channels in a 14pin pdip, soic or tssop package. The big advantage is that they can be controlled in the closed loop. The digital potentiometer ic market research study includes significant data and also forecasts up to 2026 of the global market which makes the research report a. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Ad5292 digital potentiometer analog devices digikey. Microchip offers digital potentiometer devices with typical endtoend resistances of. The wiper settings are controlled through an i2ccompatible digital interface.
Using an analog voltage to control a digital potentiometer. Know about digital potentiometer pot abstract the digital pot is a mixed signal device. The digital potentiometer will give audible steps, its break before make and not smoothed between the steps, also it works on 5 volt, and cant take any higher voltages because of the gates inside. Digital potentiometer figure 2 is a block diagram of a digital potentiometer, or digipot, connected to a microcontroller mcu. A digital potentiometer or digipot operates like a traditional mechanical potentiometer pot, which is a variable resistor, except the digipot is an integrated chip ic that accepts signal input rather than the physical movement of a shaft or slide for adjustment. Global digital potentiometer ic market is segmented by application into digital potentiometer can be used in any application where in general a trimming potentiometer or presetresistor is used. Digital potentiometer ics are available at ibs electronics from industry leading manufacturers. The ev kit, max5388 ic consists of one digital potentiometer in a variableresistor configuration and one digital, programmed independently among 256 tap positions. The digital potentiometer has several benefits over a mechanical potentiometer, including compact size, freedom from shock or vibration, and the ability to withstand oil, dust, temperature extremes, and. The digital potentiometer dp allows many of the applications of. Its fluctuating resistance can change the color or brightness of a light, the loudness or frequency of a sound, or any other parameters that depend on voltage and current. It is a kind of mixed signal ic, which is able to dynamically change the internal resistors through mcu like arduino. The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the vr latch. The analog portion of the device is the threeterminal analog component called potentiometer.
Digital potentiometers design guide microchip technology. Each potentiometer is composed of 256 resistive sections. D document feedback information furnished by analog devices is believed to be accurate and reliable. Singledual digital potentiometer with spi interface. The key to this circuit is a lowpower digital potentiometer ic, 100k. The digital potentiometer dp allows many of the applications of mechanical trimming potentiometers to be replaced by a solidstate solution.
Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points. A digital potentiometer also known as digipot, is similar to a standard analogue potentiometer, which is a variable resistor except the digital potentiometer has an integrated chip ic that accepts a signal input rather than. Digital potentiometer definition a digital potentiometer is a variable resistor which is controlled by digital signals instead of by mechanical movement. The specific digital potentiometer we will use in this circuit is the mcp41 ic. The selected step on the ladder determines the resistance ratio of the. Between each resistive section and both ends of the potentiometer are tappoints which are accessible to the wiper. Three address pins allow up to 8 ds1803s to share the same 2wire interface. Ad5260ad5262 contains a fixed resistor with a wiper contact that taps the. Keeloq, mplab, pic, picmicro, picstart, pro mate and. These include a 5wire io shift register interface and a 2wire addressable interface.
The wiper position varies linearly and is controlled via the spi interface. The wiper position is controlled by a threewire interface. In this tutorial you will learn how to control the ad5206 digital potentiometer using serial peripheral interface spi. The ic x9315 from intersil, is a digitally controlled solid state potentiometer, which internally possesses an array of resistors, wiper switches, a. The mcp41010 has outstanding ac and dc characteristics, and consumes integrated circuits ics data acquisition digital potentiometers. The ds1868 dual digital potentiometer chip consists of two digitally controlled solidstate potentiometers. Configured as a voltage divider, this ic provides an output of 32 discrete voltage steps between its minimum and maximum settings 0v and 5v. Compare and select from tis portfolio of digital potentiometers to meet the needs of your system design. For an explanation of spi see the spi library reference digital potentiometers are useful when you need to vary the resistance in a circuit electronically rather than by hand. Upon powerup, the wiper assumes a midscale position and. The potentiometer is implemented by a resistor array. Ti home data converters digital potentiometers digipots data converters.
It can be applied to applications such as led dc dimming, linear stable voltage source, oscillator, low pass filter or differential amplifier. A digital potentiometer is built either from a resistor ladder integrated circuit or a digitaltoanalog converter although a resistor ladder construction is the more common. This example shows how to control a analog devices ad5171 digital potentiometer which communicates via the i2c synchronous serial protocol. Digital potentiometer ics are available at mouser electronics from industry leading manufacturers. Analogtodigital converters adcs 932 highspeed adcs 10msps 346 isolated adcs 33. Microchip offers digital potentiometer devices with typical endtoend resistances of 2. An1760 interfacng ad8402 digital potentiometer to mc68hc705j1a. Using arduino s i2c wire library, the digital pot will step through 64 levels of resistance, fading an led the i2c protocol involves using two lines to send and receive data. Like a mechanical potentiometer, the digital potentiometer has two ends a1 and b1 and a wiper w1. In this second design we investigate the ic x9315 which is actually a solid state digital potentiometer and could be used exactly like a mechanical potentiometer, but through logical supply inputs. And8414 everything you wanted to know about digital. Ad5292 digital potentiometer analog devices ad5292 enables a new level of precision calibration in industrial systems adis introduces a digital potentiometer digipot with one of the industrys best resistor tolerances, allowing designers of industrial and instrumentation equipment to meet tighter resistor matching requirements for improved. Ds2890 3 of 27 operation the ds2890 is a single element digital potentiometer. The exact wiper position of each potentiometer can be written or read.
The position of the ds1868 dual digital potentiometer chip. This solidstate industrial potentiometer simulates an equivalent mechanical potentiometer, and fits in the same space. Device control is achieved through a 2wire serial interface. The device has a total of 256 linearly spaced tap points including the rl and rh terminals. Digitally controlled potentiometer xdcp datasheet the x9c102, x9c103, x9c104, x9c503 are digitally controlled xdcp potentiometers. Properties of digital potentiometers digital potentiometers are integrated circuit ics, some variants have a nonvolatile. The microchip name and logo, the microchip logo, and pic are registered trademarks. Each device performs the same function as a discrete potentiometer or. Contact the factory for availability of alternate resistance values ds2890. The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. Floating either terminal a or b allows the devi ce to be used as a rheostat variable resistor.
The difference is a digital potentiometer ic is controlled by software, while a regular potentiometer is controlled manually by a person. Normally lurking unseen inside stereo systems, the digital potentiometer needs no adjustment, because it adjusts itself. Maxim integrated microchip technology nuvoton technology corporation of america on semiconductor parallax inc. Ds2890 1wire digital potentiometer maxim integrated. The digital portion contains the interface, control, and registers associated with the potentiometer. Potentiometer, variable resistor with ground reference potentiometer a the max5388 ic potentiometer a is internally configured as a variable resistor. The ds1803 addressable dual digital potentiometer features two independently controlled 256position potentiometers.