CAT5116_07 Datasheet, PDF (1/12 Pages) Catalyst Semiconductor – Log-Taper, 100-Tap Digitally Programmable Potentiometer (DPP™)

CAT5116
Log-Taper, 100-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
„ 100-position, log-taper potentiometer
„ Non-volatile EEPROM wiper storage
„ 10nA ultra-low standby current
„ Single-supply operation: 2.5V – 5.5V
„ Increment Up/Down serial interface
„ Resistance value: 32kΩ
„ Available in 8-pin MSOP, TSSOP, SOIC and DIP
packages
APPLICATIONS
„ Automated product calibration
„ Remote control adjustments
„ Offset, gain and zero control
„ Audio volume control
„ Sensor adjustment
„ Motor controls and feedback systems
„ Programmable analog functions
For Ordering Information details, see page 11.
DESCRIPTION
The CAT5116 is a log-taper single digitally program-
mable potentiometer (DPP™) designed as a electro-
nic replacement for mechanical potentiometers.
Ideal for automated adjustments on high volume
production lines, DPP ICs are well suited for applica-
tions where equipment requiring periodic adjustment
is either difficult to access or located in a hazardous or
remote environment.
The CAT5116 contains a 100-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 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 CAT5116 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.
FUNCTIONAL DIAGRAM
The digitally programmable potentiometer can be used
as a three-terminal resistive divider or as a two-terminal
variable resistor.
V_CC
U/D
Control
INC
and
Memory
CS
Power On Recall
GND
General
R_H
U/D
INC
CS
R_W
R_L
GND
V_CC
R_H
INTERFACE
&
WIPER
CONTROL
Potentiometer
R = 32kΩ
EEPROM
R_L
Block Diagram
R_H
165Ω
LOG
TAPER
R_TOT= 32kΩ
R_W
R_W
11Ω
10.4Ω
R_L
Potentiometer Schematic
© 2007 Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-2118 Rev. K