CAT5127, CAT5129

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2

Figure 1. Functional Diagrams

Control

and

Memory

POR

GND

Control

and

Memory

POR

GND

(U/D)

(INC)

(CS)

CAT5127

CAT5129

(U/D)

(INC)

(CS)

Table 1. PIN DESCRIPTIONS

Name

Function

CAT5127

MSOP/TDFN

CAT5129

SOT23

INC

Increment Control

1

4

U/D

Up/Down Control

2

3

Potentiometer High Terminal

3

5

GND

Ground

4

2

NC

No Connect

5

−

Potentiometer Low Terminal

6

−

CS

Chip Select

7

1

Supply Voltage

8

6

DEVICE 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

and CS is low, any high-to-low transition on INC will cause

required that this terminal be connected to a potential greater

GND.

required that this terminal be connected to a potential less

CS: Chip Select

The chip select input is used to activate the control input

of the device 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. CAT5127 has an internal pull-up

resistor on the CS input pin.