CAT5116
Log-Taper, 100-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
DESCRIPTION
100-position, log-taper potentiometer
Non-volatile EEPROM wiper storage
10nA ultra-low standby current
Single-supply operation: 2.5V – 5.5V
Increment Up/Down serial interface
Resistance value: 32kΩ
The CAT5116 is a log-taper single digitally program-
mable potentiometer (DPP™) designed as a electro-
nic replacement for mechanical potentiometers.
Ideal for automated adjustments on high volume
production lines, DPP ICs are well suited for applica-
tions where equipment requiring periodic adjustment
is either difficult to access or located in a hazardous or
remote environment.
Available in 8-pin MSOP, TSSOP, SOIC and DIP
packages
The CAT5116 contains a 100-tap series resistor array
connected between two terminals RH and RL. An
up/down counter and decoder that are controlled by
three input pins, determines which tap is connected to
the wiper, RW.
APPLICATIONS
Automated product calibration
Remote control adjustments
Offset, gain and zero control
Audio volume control
The wiper setting, stored in nonvolatile memory, is not
lost when the device is powered down and is
automatically reinstated when power is returned. The
wiper can be adjusted to test new system values
without effecting the stored setting.
Sensor adjustment
Motor controls and feedback systems
Programmable analog functions
Wiper-control of the CAT5116 is accomplished with
¯¯
¯
¯¯¯
¯¯¯
three input control pins, CS, U/D, and INC. The INC
input increments the wiper in the direction which is
¯
¯¯
determined by the logic state of the U/D input. The CS
input is used to select the device and also store the
wiper position prior to power down.
For Ordering Information details, see page 11.
The digitally programmable potentiometer can be used
as a three-terminal resistive divider or as a two-terminal
variable resistor.
FUNCTIONAL DIAGRAM
R
H
V
R
H
CC
165Ω
V
CC
LOG
TAPER
= 32kΩ
R
R
R
H
W
L
U/D
INC
CS
INTERFACE
&
R
TOT
U/D
WIPER
CONTROL
Control
and
Memory
INC
CS
Potentiometer
R = 32kΩ
R
R
R
W
W
Power On Recall
EEPROM
11Ω
GND
10.4Ω
GND
L
R
L
General
Block Diagram
Potentiometer Schematic
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-2118 Rev. M