CAT5269WI-00TE13 datasheet(2/15 Pages) CATALYST

Part #	CAT5269WI-00TE13

Description	Dual Digitally Programmable Potentiometers (DPP) with 256 Taps and 2-wire Interface

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT5269

Document No. 2123, Rev. B

PIN DESCRIPTION

(SOIC)

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

VCC

Supply Voltage

8RL0

Low Reference Terminal for Potentiometer 0

9RH0

High Reference Terminal for Potentiometer 0

10

RW0

Wiper Terminal for Potentiometer 0

11

A2

Device Address

12

WP

Write Protection

13

SDA

Serial Data Input/Output

14

A1

Device Address

15

RL1

Low Reference Terminal for Potentiometer 1

16

RH1

High Reference Terminal for Potentiometer 1

17

RW1

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

PIN DESCRIPTIONS

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 communica-

tion with the CAT5269.

RH, RL: Resistor End Points

The two sets of RH and RL pins are equivalent

to the terminal connections on a mechanical

potentiometer.

RW:

Wiper

The RW pins are equivalent to the wiper terminal

of a mechanical potentiometer.

WP

WP:

Write Protect Input

The

WP pin when tied low prevents non-volatile

writes to the data registers (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 potentiometer (RH and

RL). The tap positions between and at the ends of the series resistors are connected to the output wiper terminals

(RW)by a CMOS transistor switch. Only one tap point for each potentiometer is connected 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.

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