The CAT5111 is a single digital POT designed as an electronic replacement for mechanical potentiometers. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment.
The CAT5111 contains a 100-tap series resistor array connected between two terminals R
and R
. An up/down counter and decoder that are controlled by three input pins, determines which tap is connected to the wiper, R
. The CAT5111 wiper is buffered by an op amp that operates rail to rail. The wiper setting, stored in non-volatile memory, is not lost when the device is powered down and is automatically recalled when power is returned. The wiper can be adjusted to test new system values without effecting the stored setting. Wiper control of the CAT5111 is accomplished with three input control pins,
, U/
, and
. The
input increments the wiper in the direction which is determined by the logic state of the U/
input. The
input is used to select the device and also store the wiper position prior to power down.
The digital potentiometer can be used as a buffered voltage divider. For applications where the potentiometer is used as a 2-terminal variable resistor, please refer to the CAT5113. The buffered wiper of the CAT5111 is not compatible with that application.

• 100-position linear taper potentiometer
• Non-volatile EEPROM wiper storage; buffered wiper
• Low power CMOS technology
• Single supply operation: 2.5 V-6.0 V
• Increment up/down serial interface
• Resistance values: 10 kΩ, 50 kΩ and 100 kΩ