CAT5112
32-Tap Digitally Programmable Potentiometer (DPP™)
with Buffered Wiper
FEATURES
s
32-position linear taper potentiometer
s
Non-volatile NVRAM wiper storage;
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
APPLICATIONS
s
Automated product calibration
s
Remote control adjustments
s
Offset, gain and zero control
s
Tamper-proof calibrations
s
Contrast, brightness and volume controls
s
Motor controls and feedback systems
s
Programmable analog functions
buffered wiper
s
Low power CMOS technology
s
Single supply operation: 2.5V-6.0V
s
Increment up/down serial interface
s
Resistance values: 10kΩ, 50kΩ and 100kΩ
Ω,
Ω
Ω
s
Available in PDIP, SOIC, TSSOP and MSOP packages
DESCRIPTION
The CAT5112 is a single digitally programmable
potentiometer (DPP™) designed as a electronic
replacement for mechanical potentiometers and trim
pots. 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 CAT5112 contains a 32-tap series resistor array
connected between two terminals R
H
and R
L
. An up/
down counter and decoder that are controlled by three
input pins, determines which tap is connected to the
wiper, R
WB
. The CAT5112 wiper is buffered by an op
amp that operates rail to rail. The wiper setting, stored in
non-volatile NVRAM memory, is not lost when the de-
vice is powered down and is automatically recalled when
power is returned. The wiper can be adjusted to test new
FUNCTIONAL DIAGRAM
V
CC
RH
system values without effecting the stored
setting. Wiper-control of the CAT5112 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.
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 appli-
cation. DPPs bring variability and programmability to a
broad range of applications and are used primarily to
control, regulate or adjust a characteristic or parameter
of an analog circuit.
R
H
U/D
INC
CS
Power On Recall
+
–
>
Control
and
Memory
+
–
RWB
R
WB
R
L
RL
V
SS
Electronic Potentiometer
Implementation
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 2002, Rev. L
1
CATALYST [ CATALYST SEMICONDUCTOR ]
