Potentiometers are the perfect tool when you want to change your circuit by turning a knob. Turns out, there are times when you want to adjust your circuit without manually turning a knob, and the DS1841 I2C Logarithmic Resistor from Maxim can do just that. It’s a programmable resistor, similar to an I2C potentiometer like the the DS3502 I2C Potentiometer, so why another?
The big difference between the two is how the resistance changes in relation to changes made to the wiper. The DS3502’s resistance has a linear relationship to the wiper’s setting. Each time you change the wiper by a given amount, the resistance will change by the same amount. 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.
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