CAT5115_07 Datasheet, PDF (1/14 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer (DPP™)

CAT5115
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
„ 32-position linear taper potentiometer
„ Low power CMOS technology
„ Single supply operation: 2.5V – 6V
„ Increment up/down serial interface
„ Resistance values: 10kΩ, 50kΩ and 100kΩ
„ Available in PDIP, SOIC, TSSOP, MSOP and
space saving 2 x 2.5mm TDFN packages
APPLICATIONS
„ Automated product calibration
„ Remote control adjustments
„ Offset, gain and zero control
„ Tamper-proof calibrations
„ Contrast, brightness and volume controls
„ Motor controls and feedback systems
„ Programmable analog functions
For Ordering Information details, see page 13.
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, C¯¯S, U/D¯,
and I¯N¯C¯. The I¯N¯C¯ input increments the wiper in the
direction which is determined by the logic state of the
U/D¯ input. The C¯¯S 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 program-
mability 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
U/D
V_CC
INC
CS
U/D
Control
INC
and
Memory
CS
Power On Recall
GND
R_H/V_H
R_W/V_W
R_L/V_L
V_CC
GND
General
5-BIT
UP/DOWN
COUNTER
5-BIT
NONVOLATILE
MEMORY
STORE AND
RECALL
CONTROL
CIRCUITRY
31
30
29
ONE 28
OF
THIRTY TWO
DECODER
2
1
0
Detailed
R_H/V_H
R_H/V_H
TRANSFER RESISTOR
GATES
ARRAY
R_W/V_W
R_L/V_L
R_W/V_W
R_L/V_L
Electronic Potentiometer
Implementation
© Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-2117 Rev. G