E
Preliminary Information
CAT5115
32-Tap Digitally Programmable Potentiometer (DPP™)
TM
FEATURES
APPLICATIONS
■ 32-position, linear-taper potentiometer
■ Low power CMOS technology
■ Automated product calibration
■ Remote control adjustments
■ Offset, gain and zero control
■ Tamper-proof calibrations
■ Single supply operation: 2.5V-5.5V
■ Increment up/down serial interface
■ Resistance values: 10kΩ, 50kΩ and 100kΩ
■ Available in PDIP, SOIC, TSSOP and MSOP packages
■ Contrast, brightness and volume controls
■ Motor controls and feedback systems
■ Programmable analog functions
DESCRIPTION
determined by the logic state of the U/D input. The CS
input is used to select the device.
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 digitally programmable potentiometer can be
used as a three-terminal resistive divider or as a
two-terminalvariableresistor.DPPsbringvariabilityand
programmability to a wide variety of applications
including control, parameter adjustments, and
signal processing.
The CAT5115 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 wiper is always set to the mid point, tap
15atpowerup. Thetappositionisnotstoredinmemory.
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
For a pin-compatible device that recalls a stored tap
position on power-up refer to the CAT5114 data sheet.
FUNCTIONAL DIAGRAM
RH /VH
Vcc (Supply Voltage)
31
30
U/D
INC
CS
VH /RH
5-BIT
UP/DOWN
COUNTER
RH /VH
UP/DOWN
29
28
(U/D)
ONE
OF
Control
and
Memory
INCREMENT
R
/
VW
THIRTY TWO
DECODER
W
RW/VW
TRANSFER
GATES
RESISTOR
ARRAY
(INC)
DEVICE SELECT
2
1
0
(CS)
RL /VL
POR
CONTROL
CIRCUITRY
Vcc
GND
V
SS
VL / RL
RL /VL
RW/VW
GENERAL
ELECTRONIC POTENTIOMETER
IMPLEMENTATION
GENERAL
DETAILED
© 2004 by Catalyst Semiconductor, Inc.
Doc. No. 2117, Rev. E
1
Characteristics subject to change without notice