CAT5113VI-00-G datasheet(2/13 Pages) ONSEMI

Part #	CAT5113VI-00-G

Description	100-Tap Digitally Programmable Potentiometer

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CAT5113

Doc. No. MD-2009 Rev. X

2

Characteristics subject to change without notice

PIN CONFIGURATION

PDIP 8-Lead (L)

SOIC 8 Lead (V)

MSOP 8 Lead (Z)

INC

¯¯¯ 1

8 VCC

U/D

¯ 2

7 CS

¯¯

RH 3

6 RL

GND 4

5 RWB

CAT

TSSOP 8 Lead (Y)

CS

¯¯ 1

8 RL

VCC 2

7 RWB

INC

¯¯¯ 3

6 GND

U/D

¯ 4

5 RH

CAT

PIN DESCRIPTIONS

Name Function

INC

¯¯¯

Increment Control

U/D

¯

Up/Down Control

RH

Potentiometer High Terminal

GND Ground

RW

Wiper Terminal

RL

Potentiometer Low Terminal

CS

¯¯

Chip Select

VCC Supply Voltage

PIN DESCRIPTION

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.

U/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

¯¯¯, U/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.

CS

¯¯ : Chip Select

The chip select input is used to activate the 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.

DEVICE OPERATION

The CAT5113 operates like a digitally controlled

potentiometer with RH and RL equivalent to the high

and low terminals and RW equivalent to the mecha–

nical 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 connected to one of the 100 taps and

controlled by three 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 non-volatile

memory using the INC

¯¯¯ and CS

¯¯ inputs.

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

¯¯

transitions HIGH while the INC

¯¯¯ input is also HIGH.

When the CAT5113 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 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 non-

volatile memory.

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