Adafruit Digital 10K Pot - Qwiic

The DS1841 I2C Logarithmic Resistor from Adafruit allows you to adjust your circuit without manually turning a knob. With the DS1841, the relationship between resistance and the wiper setting is logarithmic. This means that as the wiper setting changes, the amount of resistance will depend on where in the wiper's range the current setting is. Log potentiometers are used in audio applications for things like volume control because they better match the response of human ear to sound.

The DS1841's resistance ranges from 22kOhms to 3.7 kOhms and has 128 tap points. Even more interestingly, the DS1841 can be configured to adjust its resistance based on temperature with hysteresis to keep things from jumping around. Additionally, the temperature compensation can be adjusted by using the LUT (Look Up Table) built into the DS1841. This table allows you to specify the wiper setting for each of 70 temperature increments between -39 and 100 degrees C, plus one each for above or below that range. You can even manually set the wiper to one of the entries in the LUT.

Quick Spec

  • 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor with a 3.6kΩ Fixed Resistor
  • 128 Wiper Tap Points
  • On-Chip Temperature Sensor and ADC
  • 72-Byte Lookup Table (LUT)
  • I2C-Compatible Serial Interface
  • Address Pins Allow Up to Four DS1841s to Share the Same I2C Bus
  • Digital Supply of 2.7V to 5.5V
  • -40°C ~ +100°C Operating Range
  • Dimensions: 25.5 x 17.6 x 4.6mm
  • Net Weight: 4g

Wiper Resistance Graph

adafruit-products-a-log-curve

Wiring Diagram

AF4570-002

Resources

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Adafruit Digital 10K Pot - Qwiic

  • Brand: Adafruit
  • Product Code: AF4570
  • Weight: 0.004kg
  • Product Status : Active
  • Stock

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  • R145.00 (Inc Tax: R166.75)


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Tags: adafruit, digital, 10k, pot, potentiometer, qwiic, stemma, resistance, resistor, ds184122k, 3.7k, i2c, logarithmic