CAT5115 Datasheet, PDF (1/9 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer

Preliminary Information
CAT5115
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
APPLICATIONS
ALOGEN ^FR
LEA _{D F REETM}
s 32-position, linear-taper potentiometer
s Low power CMOS technology
s Single supply operation: 2.5V-5.5V
s Increment up/down serial interface
s Resistance values: 10kΩ, 50kΩ and 100kΩ
s Available in PDIP, SOIC, TSSOP and MSOP packages
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
DESCRIPTION
The CAT5115 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 CAT5115 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_W. The wiper is always set to the mid point, tap
15 at power up. The tap position is not stored in memory.
Wiper-control of the CAT5115 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.
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.
For a pin-compatible device that recalls a stored tap
position on power-up refer to the CAT5114 data sheet.
FUNCTIONAL DIAGRAM
Vcc (Supply Voltage)
UP/DOWN
(U/D)
INCREMENT
(INC)
DEVICE SELECT
(CS)
Control
and
Memory
POR
GND
GENERAL
GENERAL
U/D
INC
CS
R_H / V_H
RW / VW
R L / VL
Vcc
VSS
5-BIT
UP/DOWN
COUNTER
CONTROL
CIRCUITRY
31
30
29
ONE ₂₈
OF
THIRTY TWO
DECODER
2
1
0
TRANSFER
GATES
RESISTOR
ARRAY
DETAILED
R_H / V_H
V_H /R_H
VW /RW
R L / VL
RW / VW
VL / R L
ELECTRONIC POTENTIOMETER
IMPLEMENTATION
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 2117, Rev. E