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X9401

Low Noise/Low Power/SPI Bus

Quad, 64 Tap, Digitally Controlled

Potentiometer (XDCP™)

Description

The X9401 integrates 4 digitally controlled potentiometers

(XDCP) on a monolithic CMOS integrated microcircuit.

The digitally controlled potentiometer is implemented using

64 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 SPI 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

• Quad - 4 Separate Pots, 64 Taps/Pot

• Nonvolatile Storage of Wiper Position

• Four Nonvolatile Data Registers for Each Pot

• 16-bytes of EEPROM Memory

• SPI Serial Interface

• Wiper Resistance = 150

Ω Typical

• Standby Current < 3µA (Total Package)

• Operating Current < 700µA max.

• 24 Ld SOIC and 24 Ld TSSOP Package

• 100 year Data Retention

• Pb-Free Available (RoHS Compliant)

Block Diagram

INTERFACE

AND

CONTROL

CIRCUITRY

CS

SCK

SO

A0

A1

R0

R1

R2

R3

WIPER

COUNTER

REGISTER

(WCR)

RESISTOR

ARRAY

POT 1

R0

R1

R2

R3

WIPER

COUNTER

REGISTER

(WCR)

DATA

8

R0

R1

R2

R3

RESISTOR

ARRAY

R0

R1

R2

R3

RESISTOR

ARRAY

WIPER

COUNTER

REGISTER

(WCR)

WIPER

COUNTER

REGISTER

(WCR)

POT 3

POT 2

HOLD

POT 0

WP

SI

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. 2005-2006, 2009. All Rights Reserved

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

Data Sheet

FN8190.4

October 13, 2009