CAT5113
PIN CONFIGURATION
DIP Package (P, L)
PIN FUNCTIONS
TSSOP Package (U, Y)
Pin Name
Function
1
2
3
4
8
7
6
5
RL
1
2
3
4
8
7
6
5
CS
V
INC
Increment Control
Up/Down Control
INC
CC
V
CC
RW
CS
RL
U/D
RH
U/D
GND
RH
INC
GND
RW
U/D
R
H
Potentiometer High Terminal
Ground
GND
SOIC Package (S, V)
MSOP Package (R, Z)
R
Potentiometer Wiper Terminal
Potentiometer Low Terminal
Chip Select
W
L
1
2
3
4
8
7
6
5
V
INC
CC
1
2
3
4
8
7
6
5
INC
U/D
RH
VCC
CS
RL
R
CS
RL
U/D
RH
CS
GND
RW
GND
RW
VCC
Supply Voltage
PIN DESCRIPTIONS
INC: Increment Control Input
of the CAT5113 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.
TheINCinputmovesthewiperintheupordowndirection
determined by the condition of the U/D input.
U/D: Up/Down Control Input
DEVICE OPERATION
The U/D input controls the direction of the wiper
movement. When in a high state and CSis low, any high-
to-low transition on INC will cause the wiper to move one
increment toward the RH terminal. When in a low state
and CS is low, any high-to-low transition on INC will
cause the wiper to move one increment towards the
RL terminal.
The CAT5113 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RW equivalent to the mechanical
potentiometer's wiper. There are 100 available tap
positions including the resistor end points, RH and RL.
There are 99 resistor elements connected in series
between the RH and RL terminals. The wiper terminal is
connectedtooneofthe100 tapsandcontrolledbythree
inputs, INC, U/D and CS. These inputs control a seven-
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.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
greater than the RL terminal. Voltage applied to the RH
terminal cannot exceed the supply voltage, VCC or go
below ground, GND.
With CS set LOW the CAT5113 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
seven-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
transitionsHIGHwhiletheINCinputisalsoHIGH. When
the CAT5113 is powered-down, the last stored wiper
counterpositionismaintainedinthenonvolatilememory.
When power is restored, the contents of the memory are
recalled and the counter is set to the value stored.
RW: Wiper Potentiometer Terminal
RW is the wiper terminal of the potentiometer. Its position
ontheresistorarrayiscontrolledbythecontrol inputs,INC,
U/D and CS. Voltage applied to the RW terminal cannot
exceedthesupplyvoltage, VCC orgobelowground, GND.
RL: Low End Potentiometer Terminal
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
less than the RH terminal. Voltage applied to the RL
terminal cannot exceed the supply voltage, VCC or go
below ground, GND. RL and RH are electrically
interchangeable.
With INC set low, the CAT5113 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.
CS: Chip Select
The chip select input is used to activate the control input
Doc. No. 2009, Rev. R
2
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