CAT5115PI-50TESSOP datasheet(2/9 Pages) CATALYST

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CAT5115

Doc. No. 2117, Rev. E

CS: Chip Select

The chip select input is used to activate the control input

of the CAT5115 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 CAT5115 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 32 available tap

positions 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.

With

CS set LOW the CAT5115 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. When the CAT5115 is powered-

down, the wiper position is reset. When power is restored,

the counter is set to the mid point, tap 15.

PIN DESCRIPTIONS

INC

INC: Increment Control Input

The

INC input moves the wiper in the up or down

direction determined by the condition of the U/

D input.

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.

RW: Wiper Potentiometer Terminal

RW is the wiper terminal of the potentiometer. Its position

on the resistor array is controlled by the control inputs,

INC,

D and CS. Voltage applied to the RW terminal cannot

exceed the supply voltage, VCC or go below ground, 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.

PIN FUNCTIONS

Pin Name

Function

INC

Increment Control

Up/Down Control

Potentiometer High Terminal

GND

Ground

Potentiometer Wiper Terminal

Potentiometer Low Terminal

Chip Select

VCC

Supply Voltage

PIN CONFIGURATION

DIP Package (P, L)

TSSOP Package (U, Y)

MSOP Package (R, Z)

INC

VCC

GND

INC

VCC

GND

VCC

GND

INC

SOIC Package (S, V)

INC

VCC

GND

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