CAT5112
32-Tap Digitally Programmable Potentiometer (DPP™)
with Buffered Wiper
FEATURES
DESCRIPTION
The CAT5112 is a single digitally programmable
potentiometer (DPP™) designed as a 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.
32-position linear taper potentiometer
Non-volatile EEPROM wiper storage;
buffered wiper
Low power CMOS technology
Single supply operation: 2.5V-6.0V
Increment up/down serial interface
Resistance values: 10kΩ, 50kΩ and 100kΩ
The CAT5112 contains a 32-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, RWB. The CAT5112 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
Available in PDIP, SOIC, TSSOP and MSOP
packages
APPLICATIONS
Automated product calibration
Remote control adjustments
Offset, gain and zero control
Tamper-proof calibrations
setting.
Wiper-control
of
the
CAT5112
¯¯
is
¯
Contrast, brightness and volume controls
Motor controls and feedback systems
Programmable analog functions
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.
The digitally programmable 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 CAT5114. The
buffered wiper of the CAT5112 is not compatible with
that application.
For Ordering Information details, see page 10.
FUNCTIONAL DIAGRAM
R
H
V
CC
R
H
U/D
Control
and
Memory
+
–
+
–
INC
CS
R
R
R
R
WB
L
WB
Power On Recall
L
GND
Electronic Potentiometer Implementation
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2002 Rev. M