CAT5270

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Pin Description

SCL: Serial Clock

The CAT5270 serial clock input pin is used to clock all

data transfers into or out of the device.

SDA: Serial Data

The CAT5270 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−OR’d 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 CAT5270.

terminal connections on a mechanical potentiometer.

mechanical potentiometer.

Table 1. PIN DESCRIPTION

Pin #

TSSOP−14

Name

Function

1

A0

Device Address, LSB

2

Supply Voltage

3

Low Reference Terminal for

Potentiometer 0

4

High Reference Terminal for

Potentiometer 0

5

Wiper Terminal for Potentiometer 0

6

A2

Device Address

7

SDA

Serial Data Input/Output

8

A1

Device Address

9

Low Reference Terminal for

Potentiometer 1

10

High Reference Terminal for

Potentiometer 1

11

Wiper Terminal for Potentiometer 1

12

GND

Ground

13

SCL

Bus Serial Clock

14

A3

Device Address

Device Operation

compatible interface and two 8−bit wiper control 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

at the ends of the series resistors are connected to the output

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

device can be instructed to operate in an “increment/

decrement” mode.