x9440 Intersil Corporation, x9440 Datasheet

x9440

Manufacturer Part Number

x9440

Description

Mixed Signal With Spi Interface

Manufacturer

Intersil Corporation

Datasheet

1.X9440.pdf (21 pages)

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Dual Digitally Controlled Potentiometer

(XDCP™) & Voltage Comparator

FEATURES

• Two digitally controlled potentiometers and two

• SPI serial interface

• Register oriented format

• Fast response comparator

• Enable, latch, or shutdown comparator outputs

• Auto-recall of WCR and ACR data from R0

• Hardware write protection, WP

• Separate analog and digital/system supplies

• Direct write cell

• 16-bytes of EEPROM memory

• Power saving feature and low noise

• Two 10k: or two 2.5k: potentiometers

• Resolution: 64 taps each pot

• 24-lead TSSOP and 24-Lead SOIC packages

BLOCK DIAGRAM

voltage comparators in one package

—Direct read/write wiper position

—Store as many as four positions per pot

through the ACR

—Endurance–100,000 data changes per bit per

—Register data retention–100 years

HOLD

SCK

Interface

Circuitry

Control

and

Data Sheet

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

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

-R

)

0,1

WCR

ACR

DESCRIPTION

The X9440 integrates two non volatile digitally con-

trolled potentiometers (XDCP) and two voltage com-

parators on a CMOS monolithic microcircuit.

The X9440 contains two resistor arrays, each com-

posed of 63 resistive elements. Between each ele-

ment and at either end are tap points accessible to the

wiper elements. The position of the wiper element on

the array is controlled by the user through the SPI

serial bus interface.

Each potentiometer has an associated voltage com-

parator. The comparator compares the external input

voltage V

put voltage level to a logic high or low.

Each resistor array and comparator has associated

with it a wiper counter register (WCR), analog control

be directly written and read by the user. The contents

of the wiper counter register controls the position of

the wiper on the resistor array. The contents of the

analog control register controls the comparator and its

output. The potentiometer is programmed with a SPI

serial interface.

0,1

March 28, 2005

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

Intersil (and design) is a registered trademark of Intersil Americas Inc.

with the wiper voltage V

Mixed Signal with SPI Interface

–

H (0,1)

L (0,1)

W (0,1)

NI (0,1)

OUT (0,1)

and sets the out-

X9440

FN8200.0

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