CAT5269

Doc. No. MD-2123 Rev. F

2

© 2009 SCILLC. All rights reserved.

Characteristics subject to change without notice

PIN DESCRIPTIONS

PIN DESCRIPTION

SCL: Serial Clock

The CAT5269 serial clock input pin is used to

clock all data transfers into or out of the

device.

SDA: Serial Data

The CAT5269 bidirectional serial data pin is

used to transfer data into and out of the

device. The SDA pin is an open drain output

and can be wire-Ored with the other open

drain or open collector I/Os.

A0, A1, A2, A3: Device Address Inputs

These inputs set the device address when

addressing multiple devices. A total of sixteen

devices can be addressed on a single bus. A

match in the slave address must be made with

the address input in order to initiate

communication with the CAT5269.

to the terminal connections on a mechanical

potentiometer.

terminal of a mechanical potentiometer.

WP

¯¯¯: Write Protect Input

The WP

¯¯¯ pin when tied low prevents non-

volatile writes to the data register (change of

wiper control register is allowed) and when

tied high or left floating normal read/write

operations are allowed. See Write Protection

on page 7 for more details.

DEVICE OPERATION

The CAT5269 is two resistor arrays integrated with a 2-wire serial interface, two 8-bit wiper control registers and

eight 8-bit, non-volatile memory data registers. Each resistor array contains 255 separate resistive elements

connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical

to its wiper terminal at a time and is determined by the value of the wiper control register. Data can be read or

written to the wiper control registers or the non-volatile memory data registers via the 2-wire bus. Additional

instructions allow data to be transferred between the wiper control registers and each respective potentiometer's

non-volatile data registers. Also, the device can be instructed to operate in an "increment/decrement" mode.

Pin #

Name

Function

1

NC

No Connect

2

A0

Device Address, LSB

3

NC

No Connect

4

NC

No Connect

5

NC

No Connect

6

NC

No Connect

7

Supply Voltage

8

Low Reference Terminal for Potentiometer 0

9

High Reference Terminal for Potentiometer 0

10

Wiper Terminal for Potentiometer 0

11

A2

Device Address

12

WP

¯¯¯

Write Protection

13

SDA

Serial Data Input/Output

14

A1

Device Address

15

Low Reference Terminal for Potentiometer 1

16

High Reference Terminal for Potentiometer 1

17

Wiper Terminal for Potentiometer 1

18

GND

Ground

19

NC

No Connect

20

NC

No Connect

21

NC

No Connect

22

NC

No Connect

23

SCL

Bus Serial Clock

24

A3

Device Address