CAT5116 datasheet(2/12 Pages) CATALYST

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CAT5116

Doc. No. MD-2118 Rev. K

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

7 CS

¯¯

RH 3

6 RL

GND 4

5 RWB

CAT

TSSOP 8 Lead (Y)

¯¯

8 RL

VCC 2

7 RW

INC

¯¯¯ 3

6 GND

U/D

5 RH

CAT

PIN DESCRIPTIONS

Name Function

INC

¯¯¯

Increment Control

U/D

Up/Down Control

Potentiometer High Terminal

GND

Ground

Buffered Wiper Terminal

Potentiometer Low Terminal

¯¯

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.

¯¯ : Chip Select

The chip select input is used to activate the control

input of the CAT5116 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 CAT5116 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 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 nonvolatile memory using

the INC

¯¯¯ and CS

¯¯ inputs.

With CS

¯¯ set LOW the CAT5116 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

CAT5116 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 CAT5116 may be deselected

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.

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