CAT5133ZI-00-GT3 datasheet(2/10 Pages) CATALYST

Part #	CAT5133ZI-00-GT3

Description	16 Volt Digitally Programmable Potentiometer (DPPTM) with 128 Taps and an Increment Decrement Interface

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT5133

Doc. No. MD-2125 Rev. C

2

Characteristics subject to change without notice

DEVICE OPERATION

The CAT5133 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 128 available tap

positions including the resistor end points, RH and RL.

There are 127 resistor elements connected in series

between the RH and RL terminals. The wiper terminal is

connected to one of the 128 taps and controlled by

three inputs, INC

¯¯¯, U/D

¯ and CS

¯¯¯. These inputs control a

7-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 CAT5133 is selected and will

respond to the U/D

¯ and INC

¯¯¯ inputs. HIGH to LOW

transitions on INC

¯¯¯ will increment or decrement the

wiper (depending on the state of the U/D

¯ input and

7-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

CAT5133 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 CAT5133 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.

OPERATION MODES

INC

¯¯¯

CS

¯¯¯

U/D

¯

Operation

High to Low

Low

High

Wiper toward H

High to Low

Low

Wiper toward L

High

Low to High

X

Store Wiper Position

Low

Low to High

X

No Store, Return to Standby

X

High

X

Standby

PIN CONFIGURATION

MSOP Package (GZ)

PIN DESCRIPTIONS

Name

Function

1

U/D

¯

Up/Down Data Input – Determines the direction of

movement of the wiper

2

GND

Ground

3

VCC

Logic Supply Voltage (2.7V to 5.5V)

4

CS

¯¯¯

Chip Select – The chip is selected when the input is low.

5

N/C

No Connect

6

RH

High Reference Terminal for the Potentiometer

7

RW

Wiper Terminal for the Potentiometer

8

RL

Low Reference Terminal for the Potentiometer

9

V+

Analog Bias Voltage Input (+8.0V to +16.0V)

10

INC

¯¯¯

Increment Input – Moves the wiper in the direction

determined by the Up/Down input on each negative edge

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