1

®

FN8161.1

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

1-888-INTERSIL or 1-888-352-6832

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.

PRELIMINARY

X9118

Dual Supply/Low Power/1024-Tap/2-Wire Bus

Single Digitally-Controlled (XDCP™)

Potentiometer

DESCRIPTION

The X9118 integrates a single digitally controlled

potentiometer (XDCP) on a monolithic CMOS

integrated circuit.

The digital controlled potentiometer is implemented

using 1023 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.

FEATURES

• 1024 Resistor Taps – 10-Bit Resolution

• 2-Wire Serial Interface for write, read, and transfer

operations of the potentiometer

• Wiper Resistance, 40

Ω Typical @ 5V

• Four Non-Volatile Data Registers for Each

Potentiometer

• Non-Volatile Storage of Multiple Wiper Positions

• Power On Recall. Loads Saved Wiper Position on Power

Up.

• Standby Current < 3µA Max

• Analog V+/V-: -5V to +5V

•100k

Ω End to End Resistance

• Endurance: 100, 000 Data changes per bit per register

• 100 yr. Data Retention

• 14-Lead TSSOP

• Low power CMOS

FUNCTIONAL DIAGRAM

Bus

Interface &

Control

POT

2-Wire

Bus

Address

Data

Status

Write

Read

Wiper

1024-taps

Transfer

NC

NC

100k

Ω

Power On Recall

Wiper Counter

Register (WCR)

Data Registers

(DR0-DR3)

Control

Interface

V+

V-

Data Sheet

March 25, 2005