CAT5127_0708 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer (DPP™)

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
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
For Ordering Information details, see page 12.
FUNCTIONAL DIAGRAM
CAT5127
V_CC
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, 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
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.
CAT5129
V_CC
R_P
R_H
(U/D)
(INC)
Control
and
Memory
(CS)
POR
R_L
GND
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
(U/D)
R_H
(INC)
Control
and
Memory
(CS)
POR
GND
1
Doc. No. MD-2127 Rev. C