CAT5114V10TE13 datasheet(2/7 Pages) CATALYST

Part #	CAT5114V10TE13

Description	32-Tap Digitally Programmable Potentiometer

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT5112

2

Doc. No. 2002, Rev. L

of the CAT5112 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 CAT5112 operates like a digitally controlled

potentiometer with RH and RL equivalent to the high

and low terminals and RWB equivalent to the mechanical

potentiometer's wiper. There are 32 available tap posi-

tions including the resistor end points, RH and RL. There

are 31 resistor elements connected in series between

the RH and RL terminals. The wiper terminal is

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 CAT5112 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

CAT5112 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 CAT5112 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 DESCRIPTIONS

INC

INC: Increment Control Input

The

INC input (on the falling edge) moves the wiper in the

up or down direction determined by the condition of the

U/

D input.

U/

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 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.

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.

RWB: Wiper Potentiometer Terminal (Buffered)

RWB is the buffered wiper terminal of the potentiometer. Its

position on the resistor array is controlled by the control

inputs,

INC, U/D and CS.

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.

CS

CS: Chip Select

The chip select input is used to activate the control input

PIN FUNCTIONS

Pin Name

Function

INC

Increment Control

U/

D

Up/Down Control

RH

Potentiometer High Terminal

GND

Ground

RWB

Buffered Wiper Terminal

RL

Potentiometer Low Terminal

CS

Chip Select

VCC

Supply Voltage

PIN CONFIGURATION

PDIP Package (P, L)

TSSOP Package (U, Y)

MSOP Package (R, Z)

INC

VCC

CS

RL

RWB

U

/D

RH

GND

1

2

3

4

8

7

6

5

CS

INC

VCC

RL

RWB

U

/D

RH

GND

1

2

3

4

8

7

6

5

VCC

RL

RWB

GND

RH

INC

U/

D

CS

1

2

3

4

8

7

6

5

CS

INC

VCC

RL

RWB

U

/D

RH

GND

1

2

3

4

8

7

6

5

SOIC Package (S, V)

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