CAT5112 Datasheet, PDF (1/6 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer (DPP™)

Advance Information
CAT5112
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
s 32 Position Linear Taper Potentiometer
s Non-volatile NVRAM Wiper Storage
s Low Power CMOS Technology
s Single Supply Operation: 2.5V-6.0V
s Increment Up/Down Serial Interface
s Resistance Values: 10K, 20K, 50K and 100K Ω
s Available in PDIP, SOIC, TSSOP and MSOP packages
APPLICATIONS
s Automated Product Calibration
s Remote Control Adjustments
s Offset, Gain and Zero Control Systems
s Tamper-Proof Calibrations
s Contrast, Brightness and Volume Controls
s Motor Controls and Feedback Systems
s Programmable Analog Functions
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 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. 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
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 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 three-terminal resistive divider or as a
two-terminal variable resistor. DPPs bring variability and
programmability to a wide variety of applications
including control, parameter adjustments, and
signal processing.
FUNCTIONAL DIAGRAM
V_CC
U/D
Control
INC
and
Memory
CS
V_SS
© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
R_H
+
–
R _WB
R_L
1
V_H /R_H
VW /RW
VL / R L
Implementation of the
Electronic Potentiometer
Doc. No. 25091-00 Rev. 3/28/01
M-1