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DATASHEET

Low Noise/Low Power/2-Wire Bus Quad Digitally

Controlled Potentiometers (XDCP™)

X9409

The X9409 integrates 4 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 per package

• 64 resistor taps

• 2-wire serial interface for write, read and transfer operations

of the potentiometer

•50Ω wiper resistance, typical at 5V

• Four nonvolatile data registers for each potentiometer

• Nonvolatile storage of multiple wiper position

• Power-on recall. Loads saved wiper position on power-up

standby current < 1µA typical

•10kΩ end-to-end resistance

• 100 year data retention

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

•Low power CMOS

• 24 Ld TSSOP

• Pb-free (RoHS compliant)

FIGURE 1. BLOCK DIAGRAM

INTERFACE

AND

CONTROL

CIRCUITRY

SCL

SDA

A0

A1

A2

A3

WIPER

COUNTER

REGISTER

(WCR)

RESISTOR

ARRAY

POT 1

WIPER

COUNTER

REGISTER

(WCR)

DATA

8

RESISTOR

ARRAY

RESISTOR

ARRAY

WIPER

COUNTER

REGISTER

(WCR)

WIPER

COUNTER

REGISTER

(WCR)

Pot 3

POT 2

WP

POT 0

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

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

Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.

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

September 3, 2015

FN8192.6