CAT5127, CAT5129
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
32-position linear taper potentiometer
Non-volatile EEPROM wiper storage
Low standby current
Single supply operation: 2.5V – 5.5V
Increment Up/Down serial interface
Resistance values: 10kΩ, 50kΩ and 100kΩ
CAT5127 in tiny 8-lead 2mm x 2.5mm TDFN and
MSOP packages
CAT5129 in the 6-lead TSOT23 package
DESCRIPTION
The CAT5127/CAT5129 are single digitally programmable
potentiometers (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 CAT5127 contains a 32-tap series resistor array
connected between two terminals R
H
and R
L
. The
CAT5129 contains a 32-tap series resistor array
connected between two terminals R
H
and GND. An
up/down counter and decoder that are controlled by
three input pins, determines which tap is connected to
the wiper. The wiper setting, stored in nonvolatile
memory, is not lost when the device is powered down
and is automatically reinstated when power is
returned. The wiper can be adjusted to test new
system values without effecting the stored setting.
Wiper-control
of
the
CAT5127/CAT5129
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 devices are used as two-terminal variable
resistors. DPPs bring variability and programmability
to a wide variety of applications including control,
parameter adjustments, and signal processing.
APPLICATION
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
FUNCTIONAL DIAGRAM
CAT5127
V
CC
CAT5129
V
CC
R
P
(U/D)
(INC)
(CS)
POR
GND
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
R
H
(U/D)
(INC)
(CS)
POR
Control
and
Memory
R
H
Control
and
Memory
R
L
GND
1
Doc. No. MD-2127 Rev. C
CATALYST [ CATALYST SEMICONDUCTOR ]
