1

®

FN8248.3

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

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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2008. All Rights Reserved

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

X9429

Low Noise/Low Power/2-Wire Bus

Single Digitally Controlled Potentiometer

(XDCP™)

The X9429 integrates a single digitally controlled

potentiometer (XDCP) on a monolithic CMOS integrated

circuit.

The digital 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. The

potentiometer has associated with it a volatile Wiper Counter

Register (WCR) and a four non-volatile Data Registers 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 though the switches. Power-up recalls the contents of

the default data register (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

• Single Voltage Potentiometer

• 64 Resistor Taps

• 2-wire Serial Interface for Write, Read, and Transfer

Operations of the Potentiometer

• Wiper Resistance, 150W Typical at 5V

• Non-Volatile Storage of Multiple Wiper Positions

• Power-on Recall. Loads Saved Wiper Position on Power-up.

• Standby Current < 3µA Max

• 2.5kW, 10kW Total Pot Resistance

• Endurance: 100,000 Data Changes per Bit per Register

• 100 yr. Data Retention

• 14 Ld TSSOP, 16 Ld SOIC

• Low Power CMOS

• Pb-free available (RoHS compliant)

Block Diagram

POT

2-WIRE

BUS

ADDRESS

DATA

STATUS

WRITE

READ

WIPER

64-TAPS

TRANSFER

10k

Ω

INC/DEC

CONTROL

INTERFACE

BUS

INTERFACE

CONTROL

POWER-ON RECALL

WIPER COUNTER

REGISTER (WCR)

DATA REGISTERS

4 BYTES

AND

Data Sheet

October 13, 2008