Digital potentiometer ics are available at mouser electronics from industry leading manufacturers. Each digital pot consists of a series of resistive elements connected between two externally accessible end points. How to use digital potentiometers to control light and. Analog devices offers a wide range of digital potentiometer options, including different memory technologies, variety of digital interfaces, high resolution devices, and the industrys broadest endto. Renesas electronics america inc rochester electronics, llc texas. The threeterminal digital potentiometer shown in figure 1a above is essentially an adjustable resistive divider. In this tutorial you will learn how to control the ad5206 digital potentiometer using serial peripheral interface spi. A digital potentiometer is a digitallycontrolled electronic component that mimics the analog.
The threeterminal digital potentiometer shown in figure 1a above is essentially an adjustable resistive divider with a fixed endtoend resistance. Singlechannel, 1024position, 1% rtolerance digital. Floating either terminal a or b allows the devi ce to be used as a rheostat variable resistor. One of the most common types of variable resistors is the potentiometer. Potentiometer or pots, are three terminal devices, used to vary the resistance in a circuit. Cat5259 quad digital potentiometer pot with 256 taps and i2c interface description the cat5259 is four digital pots integrated with control logic and 16 bytes of nvram memory. Every step on the resistor ladder has its own switch which can connect this step. To simplify the p rogramming, the linear step incr ement or decrement commands can be used to move the rdac wiper up or down, one step at a time. Nonvolatile memory, dual 1024 position digital potentiometer data sheet ad5235 rev. It is a kind of mixed signal ic, which is able to dynamically change the internal resistors through mcu like arduino. Microchip technologys mcp401x, mcp402x, mcp41xxx and mcp42xxx have a maximum idd of 1.
Tb3073 implementing a 10bit digital potentiometer using a. However, no responsibility is assumed by analog devices for its use, nor for any i nfringements of patents or other rights of third parties that may result from its use. The digital portion contains the interface, control, and registers associated with the potentiometer. X9119tv14z x9119tv14z digital potentiometer ics single. Digital potentiometer design guide 3 digital potentiometer solutions low power applications many applications are very power sensitive. Ds1808 dual log digital potentiometer maxim integrated. How to use digital potentiometers to control light and sound. Microchip offers digital potentiometer devices with typical endtoend resistances of 2. Ad5231 nonvolatile memory, 1024position digital potentiometers.
The max5481max5484 10bit 1024tap nonvolatile, lineartaper, programmable voltagedividers and variable resistors perform the function of a mechanical. Nonvolatile memory, 1024 position digital potentiometer ad5231 rev. 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. However, no responsibility is assumed by analog devices for its use, nor for any i nfringements of patents or other.
Other operations include linear step increment and decrement. Nonvolatile memory, 1024position digital potentiometer ad5231 rev. Digital potentiometer ics digital pot 128 step spi sngl ch 5 pieces by microchip technology only 3 left in stock order soon. The resolution of the ds1808 is shown in figure 8 and represents 1db per step for the first 12 taps, 2db per step for the next 12 taps and 3db per step for the bottom 8 taps, providing a total attenuation range of 60db. I am using a max5481 1024 step digital potentiometer, with internal nonvolatile eeprom memory, to store the wiper position. By breaking down the process into smaller steps, it has established a much simpler method for these calculations. Take photos or make note of how everything fits together so you put it all back together the same way. Nonvolatile memory, dual 1024 position digital potentiometer. Conclusion this application note has explained the relevant calculations required for determining the wiper voltage of a digital potentiometer. Overview the terminal control feature allows any of the three digital potentiometer. Analogtodigital converters adcs 932 highspeed adcs 10msps 346 isolated adcs 33.
Description the max5481max5484 10bit 1024 tap nonvolatile, lineartaper, programmable voltagedividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a pinconfigurable 3wire serial spicompatible interface or updown digital interface. However, no responsibility is assumed by analog devices for itsuse, nor for any infringements of patents or other rights of third parties thatmay result from its use. Quad digital potentiometers dp with 256 taps and 2wire interface features four linear taper digital potentiometers 256 resistor taps per potentiometer end to end resistance 50k or 100k potentiometer control and memory access via 2wire interface i2c like low wiper resistance, typically wiper outputs with cmos switches. Singlechannel, 1024position, 1% rtolerance digital potentiometer ad5293 rev. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or. Ti home data converters digital potentiometers digipots data converters. Document feedbackd information furnished by analog devices is believed to be accurate and reliable. The resolution of a digital potentiometer is normally indicated by the number of bits necessary to encode for step selection and set the resistance the number of discretized steps 2 n, where n is the bit resolution of the digital potentiometer.
A digital potentiometer makes use of a resistor ladder and electronic switches instead of mechanical movement to change its. Nonvolatile memory, 1024 position digital potentiometer data sheet ad5231 rev. The digital potentiometer is based on the cmos string dac architecture previously described in tutorial. These devices are capable of operating across a wide voltage range. The ad5293 is a singlechannel, 1024position digital potentiome ter in this data sheet, the terms digital potentiometer and rdac are used. Rdnl measures the relative step change from ideal between successive tap positions. Know about digital potentiometer pot abstract the digital pot is a mixed signal device. Ad5235bruz250 ad5235bruz250, digital potentiometer 250k. The analog portion of the device is the threeterminal analog component called potentiometer.
Digital potentiometers typically have 8, 16, 32, 64, 100, 128, 256, or 1,024 taps. This example shows how to control a analog devices ad5171 digital potentiometer which communicates via the i2c synchronous serial protocol. Ad5235 nonvolatile memory, dual 1024position digital. The number of steps is normally indicated with a bit value e. Ad520 differential amplifier datasheet fdp360p ad5235 ad5235bru250 ad5235bru25 200h rheostat 1k preset code 6a analog devices potentiometer rheostat speed control circuit. Using arduinos 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. Nonvolatile memory, 1024position digital potentiometer data sheet ad5231 rev.
These devices perform the same electronic adjustment function as a mechanical potentiometer with enhanced resolution, solidstate reliability, and superior low temperature coefficient performance. Product index integrated circuits ics data acquisition digital potentiometers. Nonvolatile memory, 1024 position digital potentiometer data sheet ad5231. Nonvolatile memory, 1024position digital potentiometer. The selected step on the ladder determines the resistance ratio of the digital potentiometer. A information furnished by analog devices is believed to be accurate and reliable. Compare and select from tis portfolio of digital potentiometers to meet the needs of your system design. A digital potentiometer also known as digital resistor has the same function as a normal potentiometer but instead of mechanical action it uses digital signals and switches. There is always one more tap than the number of resistance values in a digital potentiometer. Basic digital potentiometer characteristics and advantages as discussed previously, digital potentiometers allow you to control resistance using digital inputs. Cat5259 quad digital potentiometer pot with 256 taps. Data acquisition digital potentiometers integrated.
X9118tv14iz x9118tv14iz digital potentiometer ics single. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other. C information furnished by analog devices is believed to be accurate and reliable. Eemem can also be retrieved through direct programming and external preset pin control. Max5481 10bit, nonvolatile, lineartaper digital potentiometers. No license is granted by implication or otherwiseunder any patent or patent rights of analog devices. The digital potentiometers arduino shield has been tested for compatibility with arduino duemilanove, diecimila, and arduino uno r1r2. Each device performs the same function as a discrete potentiometer or. Description the max5481max5484 10bit 1024tap nonvolatile, lineartaper, programmable voltagedividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a pinconfigurable 3wire serial spicompatible interface or updown digital interface. It can be applied to applications such as led dc dimming, linear stable voltage source, oscillator, low pass filter or differential amplifier. F information furnished by analog devices is believed to be accurate and reliable. The ad5235 provides a dual channel, digitally controlled digital potentiometer2 with resolution of 1024 positions.
Quad digital potentiometers dp with 256 taps and 2wire. Maxim integrated microchip technology nuvoton technology corporation of america on semiconductor parallax inc. Digital potentiometers digipots 9 digital toanalog converters dacs 334 highspeed dacs 10msps 72 precision dacs digital xray. Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points. Tb3073 implementing a 10bit digital potentiometer using. Limitations of this implementation will be covered so that application issues may be understood. Reading a potentiometer and changing a potentiometer reading to a percentage components needed. Digital potentiometers design guide microchip technology. This is done by making use of a resistor ladder, a string of small resistors in series. Digital potentiometer is also called digital pot in short. X9119tv14z x9119tv14z digital potentiometer ics single dcp. Step 1 how to repair a broken potentiometer or pot once you have removed the affected pot potentiometer from the guitar, set it on a stable surface. At every step of the ladder, an electronic switch is present. Ad5207 2channel 256position digital potentiometer datasheet pdf.
Singlechannel, 1024 position, 1% rtolerance digital potentiometer ad5293 rev. How to calculate the wiper voltage of a digital potentiometer. Nonvolatile memory, dual 1024position digital potentiometer. May 24, 2014 i am using a max5481 1024 step digital potentiometer, with internal nonvolatile eeprom memory, to store the wiper position. Analog devices offers a wide range of digital potentiometer options, including different memory technologies, variety of digital interfaces, high resolution devices, and the industrys broadest endtoend resistance options. And8414 everything you wanted to know about digital. How to repair a broken potentiometer or pot ifixit. Nonvolatile memory, 1024 position digital potentiometer. Nonvolatile memory, 1024position digital potentiometer data. Nonvolatile memory, 1024 position digital potentiometer data. Digital potentiometer digital resistors resistor guide. D document feedback information furnished by analog devices is believed to be accurate and reliable. Using arduinos i2c wire library, the digital pot will step through 64 levels of resistance, fading an led.
This way, during reboot or reset, the pot will automatically go to the wiper position stored in eeprom. 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. There is always one more tap than the number of resistance values in a. Nonvolatile memory, dual 1024position digital potentiometer data sheet ad5235 rev. These limitations may be an acceptable tradeoff to the possible cost savings. To simplify the programming, the independent or simultaneous linearstep increment or decrement commands can be used to move the rdac wiper up or down. Please view our selection of digital potentiometer ics below. Digital potentiometers are integrated circuits that implement a resistive ladder and a digital means of addressing a particular tap on the ladder that corresponds to the wiper position of a.