REV 1.1.13 12/09/02

Characteristics subject to change without notice.

1 of 18

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X9241A

FEATURES

• Four potentiometers in one package

• 2-wire serial interface

• Register oriented format

—Direct read/write/transfer of wiper positions

—Store as many as four positions per

potentiometer

• Terminal Voltages: +5V, -3.0V

• Cascade resistor arrays

• Low power CMOS

• High Reliability

—Endurance–100,000 data changes per bit per

register

—Register data retention–100 years

• 16-bytes of nonvolatile memory

• 3 resistor array values

—2K

Ω to 50KΩ mask programmable

—Cascadable for values of 500

Ω to 200KΩ

• Resolution: 64 taps each pot

• 20-lead plastic DIP, 20-lead TSSOP and 20-lead

SOIC packages

DESCRIPTION

The

X9241A

integrates

four

digitally

controlled

potentiometers

(XDCP)

on

a

monolithic

CMOS

integrated microcircuit.

The digitally controlled potentiometer is implemented

using 63 resistive elements in a series array. Between

each element are tap points connected to the wiper

terminal through switches. The position of the wiper on

the array is controlled by the user through the 2-wire

bus interface. Each potentiometer has associated with

it a volatile Wiper Counter Register (WCR) and 4

nonvolatile Data Registers (DR0:DR3) that can be

directly written to and read by the user. The contents

of the WCR controls the position of the wiper on the

resistor array through the switches. Power up recalls

the contents of DR0 to the WCR.

The

XDCP

can

be

used

as

a

three-terminal

potentiometer or as a two-terminal variable resistor in

a wide variety of applications including control,

parameter adjustments, and signal processing.

Low Power/2-Wire Serial Bus

BLOCK DIAGRAM

Data

8

R1

R0

R3

R2

Wiper

Counter

Register

(WCR)

Register

Array

Pot 1

Wiper

Counter

Register

(WCR)

R1

R0

R3

R2

SCL

SDA

A0

A1

A2

A3

Interface

and

Control

Circuitry

Register

Array

Pot 2

Wiper

Counter

Register

(WCR)

R1

R0

R3

R2

Register

Array

Pot 3

Wiper

Counter

Register

(WCR)

R1

R0

R3

R2

A V A I L A B L E

AN20 • AN42–48 • AN50-53 • AN73 • AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135