1

®

FN8248.2

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.

X9429

Low Noise/Low Power/2-Wire Bus

Single Digitally Controlled Potentiometer

(XDCP™)

FEATURES

• Single Voltage Potentiometer

• 64 Resistor Taps

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

Transfer Operations of the Potentiometer

• Wiper Resistance, 150

Ω Typical at 5V

• Non-Volatile Storage of Multiple Wiper Positions

• Power-on Recall. Loads Saved Wiper Position

on Power-up.

• Standby Current < 5µA Max

• 2.5k

Ω, 10kΩ 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 Plus Anneal Available (RoHS Compliant)

DESCRIPTION

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. Powerup 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.

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

Data Sheet

October 19, 2005