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X9241A

Low Power/2-Wire Serial Bus

Quad Digitally Controlled Potentiometer

(XDCP™)

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.

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 Ld plastic DIP, 20 Ld TSSOP and 20 Ld SOIC

packages

• Pb-free plus anneal available (RoHS compliant)

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

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

Data Sheet

FN8164.1

September 15, 2005