Properties of digital potentiometers digital potentiometers are integrated circuit ics, some variants have a nonvolatile memory eeprom which remembers the wiper position. The wiper position is controlled by a threewire interface. Digital potentiometer microchips large portfolio of digital potentiometers digipots service a broad range of precisioncontrolled applications. Digital potentiometer pot the ca5171 is a 256position digital linear taper potentiometer ideally suited for replacing mechanical potentiometers and variable resistors. Besides its unique otp feature, the ad5171 lends itself well to other generalpurpose digital potentiometer applications due to its temperature performance, small form factor, and low cost.
In addition to single potentiometers, such as the ad5245, ad5246, and ad5247, digital potentiometers are available as duals, triples, quads, and hex versions. The mcp41xxx is a singlechannel digital potentiometer. Potentiometer datasheet, potentiometer pdf, potentiometer data sheet, potentiometer manual, potentiometer pdf, potentiometer, datenblatt, electronics potentiometer. The digital portion contains the interface, control, and registers associated with the potentiometer. The mcp4xxx digital potentiometer daughter board allows the system designer to quickly evaluate the operation of microchip technology s mcp42xxx and mcp402x digital potentiometers. The wiper settings are controllable through an i2ccompatible digital interface, which can also be used to read back the wiper register content. One of the most common types of variable resistors is the potentiometer. Ad5206 contains a fixed resistor with a wiper contact that taps the fixed.
Please view our selection of digital potentiometer ics below. Addressable dual digital potentiomete maxim integrated. Free tools for electronics designers, eagle libraries. How to use digital potentiometers to control light and sound. The potentiometer is implemented by a resistor array. 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. Different from mechanical potentiometers, the wiper of the digital potentiometers operates like steps. X9c102, x9c103, x9c104, x9c503 datasheet renesas electronics.
Just like a regular potentiometer, a digital pot ic comes in all different values of resistance. Max5487 dual, 256tap, nonvolatile, spiinterface, linear. They only differ in the value of the overall resistance. This device can be used as a threeterminal potentiometer or as a twoterminal rheostat. The tpl800225 is a programmable resistor device implementing two digital. The tpl0501 is currently offered with endtoend resistance of 100 k the internal registers of the tpl0501 can be accessed using a spicompatible interface. This device can be used as a programmable resistor or resistor divider. Although this drag is not large, it prevents the pot from being used as a rotary sensor in more sensitive applications. Outline digital potentiometers on the contrary, there are some disadvantages in digital potentiometers. The dallastat can be controlled by either a switch contact closure input or a digital source input such as a cpu. The wiper settings are controlled through an i2ccompatible digital interface. Jan 10, 2017 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.
Analogto digital converters adcs 932 highspeed adcs 10msps 346 isolated adcs 34. A allows for usage in portable batteryoperated applications. There are three different models of this device, mcp41010, mcp41050, and mcp41100. Thumbwheels and shafts can be provided either separately or already inserted in the potentiometer. Device control is achieved through a 2wire serial interface. 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. Everything you wanted to know about digital potentiometer pot abstract the digital pot is a mixed signal device. Internal weak pullup on all digital inputs wide operating voltage. Using arduino s i2c wire library, the digital pot will step through 64 levels of resistance, fading an led.
This discussion will include implementation details for the digital potentiometer s resistor network. This type of potentiometer is often used in audio volume control logarithmic taper as well as many other applications. Im working on a small project where i am using the arduino s analog read to read the voltage from a potentiometer. The position of the ds1868 dual digital potentiometer chip. Microchip offers digital potentiometer devices with typical endtoend resistances of 2. Bom consolidation one op amp and one digital potentiometer supporting the various sensor options this application note will discuss implementations of programmable gain circuits using an op amp and a digital potentiometer. Digital potentiometers design guide microchip technology. A potentiometer variable resistor allows you to change the voltage input that goes into the integrated circuit.
Digital potentiometer definition a digital potentiometer is a variable resistor which is controlled by digital signals instead of by mechanical movement. Each channel of the ad5204 ad5206 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the spicompatible serialinput register. I have taken this voltage and mapped it to values between 025 for letters to be displayed on an lcd screen. 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. The ds1669 dallastat is a digital rheostat or potentiometer. Digital potentiometers solve that problem by allowing you to control a voltage splitter with digital signals. App note 4051 using an analog voltage to control a digital potentiometer app note 3317. Rotary potentiometers, rheostats potentiometers, variable.
The standard resistive ranges are 10 k, 50 k, and 100 k. The ad7376 features sleepmode programmability in shutdown that can be used to program the preset before device activation, thus providing an alternative to costly eeprom solutions. The wiper position varies linearly and is controlled via the spi interface. Normally lurking unseen inside stereo systems, the digital potentiometer needs no adjustment, because it adjusts itself. Digital potentiometer ics are available at mouser electronics from industry leading manufacturers. Potentiometer working, their applications and different types.
But basically, you supply a digital pot with voltages for both ends sometimes labeled h and l for high and low and you get a voltage between those two at the wiper sometimes labeled w depending upon the binary input that you supply it. Maxim integrated microchip technology nuvoton technology corporation of america on semiconductor parallax inc. For detailed information and a breakdown of device nomenclature and numbering systems, please see the on semiconductor device. Tandem 64 tap digital potentiometer datasheet texas instruments. Microchip offers a wide range of devices that allow you to select the best fit for your application needs. Out of necessity, most potentiometers can dissipate only a few watts of power at most. Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points. The mcp41010 is a singlechannel, 8bit digital potentiometer features 10k. Multiple devices per package offer 1% matching in ganged potentiometer applications as well as reducing pc board real estate requirements. In this tutorial you will learn how to control the ad5206 digital potentiometer using serial peripheral interface spi. Between each resistive section and both ends of the potentiometer are tappoints which are accessible to the wiper. Digital potentiometer dcp evaluation usb kit user guide. The resistance between the wiper and either endpoint of the fixed. The max5487max5488max5489 dual, lineartaper, digital potentiometers function as mechanical potentiometers with a simple 3wire spicompatible digital interface that programs the wipers to any one of 256 tap positions.
Buy products related to digital potentiometer products and see what customers say about digital potentiometer products on free delivery possible on eligible purchases. This device provides 64 possible uniform tap points over the entire resistive range. General description the ad5235 is a dual channel, nonvolatile memory, 1 digitally. For instance, it is common to hear a student say something like this, turning the potentiometer so the wiper moves up will increase the resistance of the potentiometer. The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. The tpl0102 can be configured as a twoterminal rheostat as used in this application. Digipots are typically available with linear or logarithmic tap points. A very common misconception students have about potentiometers is the relationship between resistance and direction of wiper motion.
How to build a digital potentiometer circuit with a mcp41. If the device needed to have this resolution over an entire 5v range, then the digital potentiometer would require 1280 steps, which. Ds3903 triple 128position nonvolatile digital potentiometer. Wiper position is maintained in the absence of power in eeprom. Digital potentiometers are a three terminal device, two fixed end terminals and one wiper terminal which is used to vary the resistance. Temperature sensor ics healthcare sensor ics analog. All parts are guaranteed to operate over the automotive temper ature range of. Compare and select from tis portfolio of digital potentiometers to meet the needs of your system design. Potentiometer or rheostat configuration options resistor network resolution. The ad7376 performs the same electronic adjustment function as mechanical potentiometers, variable resistors, and trimmers with enhanced resolution, solidstate reliability, and programmability.
Tpl0501 256taps, singlechannel, digital potentiometer. D document feedback information furnished by analog devices is believed to be accurate and reliable. The tpl0102 features a resistance range from roughly 0. Renesas electronics america inc rochester electronics, llc. Purpose is to reduce the supply voltage for a 41w positive displacement pump so that the flow characteristics can be digitally controlled. Digital potentiometer functional block diagram up down cntr rs d e c o d e 7 40h por en ad5220 vdd a w b gnd clk cs ud features 128 position potentiometer replacement 10 kv, 50 kv, 100 kv very low power. Understanding digital potentiometer resistor variations. Our portfolio enables fine tuning with highly accurate, small form factor, digitally controlled resistor solutions. Acps potentiometers can be adjusted from either side, both in the. The most common form of the potentiometer is the single turn rotary potentiometer.
Three address pins allow up to 8 ds1803s to share the same 2wire interface. The difference is a digital potentiometer ic is controlled by software, while a regular potentiometer is controlled manually by a person. Ds2890 1wire digital potentiometer maxim integrated. Digital potentiometers data sheet ad5204ad5206 rev. Potentiometer or pots, are three terminal devices, used to vary the resistance in a circuit. Digital potentiometer 10k com106 sparkfun electronics. C information furnished by analog devices is believed to be accurate and reliable. Oct, 2015 ds1804 datasheet pdf digital potentiometer, ds1804 datasheet, ds1804 pdf, pinout, data, circuit, ic, manual, substitute, parts, schematic, equivalent. The mcp41xxx is a singlechannel device and is offered in an 8pin pdip or soic package. The ds1809 dallastat is a single, 64position digital potentiometer which provides both a simple contact closurecontrolled interface and a microprocessorcontrolled interface. There are some examples of script files provided for your convenience, that can be opened by following script execution file open script file from the menu bar.
The analog portion of the device is the threeterminal analog component called potentiometer. Ds1808 dual log digital potentiometer maxim integrated. The mcp42xxx contains two independent channels in a 14pin pdip, soic or tssop package. Integrated circuit can now output variety of pulse widths to the transistors on the hbridge.
Product index integrated circuits ics data acquisition digital potentiometers. The numbers of the type of total resistance values are few. Tpl0501 256taps, singlechannel, digital potentiometer with. Singledual digital potentiometer with spi interface. Script files can be executed only in i2c and spi interface product windows. This example shows how to control a analog devices ad5171 digital potentiometer which communicates via the i2c synchronous serial protocol. Nonvolatile memory, 1024position digital potentiometer ad5231 rev. The device has a total of 256 linearly spaced tap points including the rl and rh terminals. A script file is a text file written in notepad or other simple text editing programs. Data acquisition digital potentiometers integrated. Each potentiometer is composed of 256 resistive sections. 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. The ds1803 addressable dual digital potentiometer features two independently controlled 256position potentiometers.
Digitally controlled potentiometer xdcp datasheet the x9c102, x9c103, x9c104, x9c503 are digitally controlled xdcp potentiometers. Potentiometers, variable resistors rotary potentiometers, rheostats are in stock at digikey. The specific digital potentiometer we will use in this circuit is the mcp41 ic. Potentiometer or rheostat configuration options resistor network resolution 7bit. So, if the digital potentiometer is 8bits 256 steps and the delta voltage between va and vb is 1v, then each step of the digital potentiometer results in a change of 1256 v, or 3.
Digital potentiometers design guide supporting digital potentiometer applications, including. Otp is a costeffective alternative over the eemem approach for users who do not need to reprogram new memory settings in the digital potentiometer. Ds2890 3 of 27 operation the ds2890 is a single element digital potentiometer. Digital potentiometers digipots are used to trim and scale analog signals. The friction between the potentiometer s wiper and resistive element creates a drag or inertia that the pot must overcome before it turns. Singledual digital potentiometer with spi interface microchip.
What links here related changes upload file special pages permanent link page information wikidata item cite this page. Ti home data converters digital potentiometers digipots data converters. The mcp41010 has outstanding ac and dc characteristics, and consumes digital potentiometers to meet the needs of your system design. The exact wiper position of each potentiometer can be written or read.
They provide an output resistance that is variable based on digital inputs and so are sometimes referred to as resistive digital toanalog converters rdacs. The tpl0501 device is a singlechannel, lineartaper, digital potentiometer with 256 wiper positions. Download the free library loader to convert this file for your ecad tool. The mcp42xxx are dual digital potentiometer devices that have the same characteristics as their single digital potentiometer devices mcp41xxx. 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. Potentiometers are incredibly useful, whether youre controlling the volume on your stereo or the. The wiper position of the mcp41xxx42xxx varies linearly and is controlled via.
Ad5207 2channel 256position digital potentiometer datasheet pdf technical report. This combination of potentiometer, integrated circuit and pwm to the hbridge is the key to speed control. The ds1868 dual digital potentiometer chip consists of two digitally controlled solidstate potentiometers. And8414 everything you wanted to know about digital. 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. Thirtytwo tap points are accessible to the wiper along the resistor string. Upon powerup, the wiper assumes a midscale position and. Information furnished by analog devices is believed to be. An16 using digital potentiometers for programmable.
Mcp41010ip microchip technology digital potentiometer ics 256 step spi. This discussion will include implementation details for the digital potentiometers resistor network. Tpl0501 256taps, singlechannel, digital potentiometer with spi. A digital potentiometer is a digitallycontrolled electronic component that mimics the analog. With digital rather than manual control, the ad7376 provides layout flexibility and allows closedloop dynamic controllability. I would like to build a prototype circuit that is the equivalent of a digital potentiometer to control a 120vac 400ma load. Ad5260ad5262 contains a fixed resistor with a wiper contact.
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