Maxim > Design Support > Technical Documents > Application Notes > Digital Potentiometers > APP 2140
Keywords: potentiometer, non-volatile, nonvolatile, voltage reference, digital I/O, LCD, fan, photodiode,
comparator, pressure sensor
APPLICATION NOTE 2140
Examples Using the DS3930 as Voltage
References and Digital I/O
Jul 11, 2003
Abstract: The DS3930 contains six 256-position nonvolatile potentiometers, which makes the DS3930 an
ideal device for applications needing multiple voltage references. The DS3930 also has four general-
purpose, nonvolatile I/O pins that can monitor a digital input or supply a digital output. This application
note provides examples using the DS3930 as a voltage reference and digital I/O.
Introduction
The DS3930 contains six 256-position nonvolatile (NV) potentiometers (see Figure 1), which makes the
DS3930 an ideal device for applications needing multiple voltage references. All six potentiometers share
a common low side. The potentiometers are separated into two groups of three 50kΩ potentiometers in
parallel. Each group of three shares a common high side. The potentiometer wiper voltage can vary
between 0V and V
HI
in 256 steps, where V
HI
is the voltage on HI
0-2
or HI
3-5
.
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