FN8192 Rev.6.00

Page 1 of 19

Sep 3, 2015

FN8192

Rev.6.00

Sep 3, 2015

X9409

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

(XDCP)

DATASHEET

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

OBSOLETE PRODUCT

NO RECOMMENDED REPLACEMENT

contact our Technical Support Center at

1-888-INTERSIL or www.intersil.com/tsc