CAT5114 Catalyst Semiconductor, CAT5114 Datasheet - Page 2

• Manufacturer Part Number: CAT5114
• Description: 32-Tap Digitally Programmable Potentiometer (DPP)
• Manufacturer: Catalyst Semiconductor

PIN DESCRIPTIONS
INC
INC
INC: Increment Control Input
INC
INC
The INC input moves the wiper in the up or down direction
determined by the condition of the U/D input.
U/D D D D D : Up/Down Control Input
The U/D input controls the direction of the wiper
movement. When in a high state and CS is low, any high-
to-low transition on INC will cause the wiper to move one
increment toward the R
and CS is low, any high-to-low transition on INC will
cause the wiper to move one increment towards the
R
R
R
required that this terminal be connected to a potential
greater than the R
terminal cannot exceed the supply voltage, V
below ground, GND.
R
R
on the resistor array is controlled by the control inputs, INC,
U/D and CS. Voltage applied to the R
exceed the supply voltage, V
R
R
required that this terminal be connected to a potential
less than the R
terminal cannot exceed the supply voltage, V
below ground, GND. RL and RH are electrically
interchangeable.
CS
CS
CS: Chip Select
CS
CS
The chip select input is used to activate the control input
CAT5114
Doc. No. 25091-00 Rev. 3/01
M-1
PIN CONFIGURATION
GND
INC
U/D
L
H:
H
W
W
L
L
R
: Low End Potentiometer Terminal
is the low end terminal of the potentiometer. It is not
terminal.
: Wiper Potentiometer Terminal
is the high end terminal of the potentiometer. It is not
DIP/SOIC Package
H
is the wiper terminal of the potentiometer. Its position
High End Potentiometer Terminal
H
terminal. Voltage applied to the R
L
R
R
terminal. Voltage applied to the R
V
CS
L
CC
W
H
terminal. When in a low state
V
CC
INC
U/D
GND
CS
CC
INC
U/D
R
or go below ground, GND.
H
TSSOP Package
MSOP Package
W
terminal cannot
CC
CC
R
R
V
CS
R
R
R
GND
or go
or go
CC
W
L
L
W
H
H
L
2
of the CAT5114 and is active low. When in a high
state, activity on the INC and U/D inputs will not
affect or change the position of the wiper.
DEVICE OPERATION
The CAT5114 operates like a digitally controlled
potentiometer with R
and low terminals and R
potentiometer's wiper. There are 32 available tap posi-
tions including the resistor end points, R
are 31 resistor elements connected in series between
the R
connected to one of the 32 taps and controlled by three
inputs, INC, U/D and CS. These inputs control a five-bit
up/down counter whose output is decoded to select the
wiper position. The selected wiper position can be
stored in nonvolatile memory using the INC and
CS inputs.
With CS set LOW the CAT5114 is selected and will
respond to the U/D and INC inputs. HIGH to LOW
transitions on INC wil increment or decrement the
wiper (depending on the state of the U/D input and five-
bit counter). The wiper, when at either fixed terminal,
acts like its mechanical equivalent and does not move
beyond the last position. The value of the counter is
stored in nonvolatile memory whenever CS transitions
HIGH while the INC input is also HIGH. When the
CAT5114 is powered-down, the last stored wiper counter
position is maintained in the nonvolatile memory. When
power is restored, the contents of the memory are
recalled and the counter is set to the value stored.
With INC set low, the CAT5114 may be de-selected
and powered down without storing the current wiper
position in nonvolatile memory. This allows the
system to always power up to a preset value stored
in nonvolatile memory.
PIN FUNCTIONS
Pin Name
INC
U/D
R
GND
R
R
CS
V
CC
H
W
L
H
and R
L
Increment Control
Up/Down Control
Potentiometer High Terminal
Ground
Potentiometer Wiper Terminal
Potentiometer Low Terminal
Chip Select
Supply Voltage
terminals. The wiper terminal is
H
and R
W
Function
equivalent to the mechanical
L
Advance Information
equivalent to the high
H
and R
L
. There