digital potentiometer control


Posted on Sep 1, 2012

Digitally controlled potentiometers are useful for generating analog control voltages under the control of a microcontroller. In some applications, manual pushbutton switches could replace a microcontroller and simplify product design. Mechanical switches exhibit contact bounce, and, when a user actuates them, they may open and close many times before reaching a stable state. A digital potentiometer`s control inputs lack switch-debouncing capabilities, and its up/down control is not suited for pushbutton operation. Figure 1 illustrates solutions to these issues and shows how to use a digital potentiometer to control a boost converter.



The potentiometer, IC1, a MAX5160M, presents an end-to-end resistance of 100 k. To increment the wiper`s position, W, you press and hold the pushbutton, S2, to pull the pin high and then press and release pushbutton S1 to pulse the input




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