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Nonvolatile Digital Potentiometer

FEATURES

DESCRIPTION

The X9241 integrates four nonvolatile E

2

POT digitally

controlled potentiometers on a monolithic CMOS micro-

circuit.

The X9241 contains four resistor arrays, each com-

posed of 63 resistive elements. Between each element

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 two-wire serial bus

interface.

Each resistor array has associated with it a wiper counter

register and four 8-bit data registers that can be directly

written and read by the user. The contents of the wiper

counter register control the position of the wiper on the

resistor array.

The data register may be read or written by the user. The

contents of the data registers can be transferred to the

wiper counter register to position the wiper. The current

wiper position can be transferred to any one of its

associated data registers.

The arrays may be cascaded to form resistive elements

with 127, 190 or 253 taps.

鈥?/div>

Four E

2

POTs in One Package

Two-Wire Serial Interface

Register Oriented Format

鈥擠irectly Write Wiper Position

鈥擱ead Wiper Position

鈥擲tore as Many as Four Positions per Pot

Instruction Format

鈥擰uick Transfer of Register Contents to

Resistor Array

鈥擟ascade Resistor Arrays

Low Power CMOS

Direct Write Cell

鈥擡ndurance - 100,000 Data Changes per Register

鈥擱egister Data Retention - 100 years

16 Bytes of E

2

PROM memory

3 Resistor Array Values

鈥?K

鈩?/div>

to 50K

鈩?/div>

Mask Programmable

鈥擟ascadable For Values of 500

鈩?/div>

to 200K

鈩?/div>

Resolution: 64 Taps each Pot

20-Lead Plastic DIP, 20-Lead TSSOP and

20-Lead SOIC Packages

FUNCTIONAL DIAGRAM

VH2

WIPER RESISTOR

COUNTER ARRAY

REGISTER

POT 2

(WCR)

R0 R1

WIPER

COUNTER

REGISTER

(WCR)

R2 R3

SCL

SDA

A0

A1

A2

A3

VH0

R0 R1

VL0

VW0

R2 R3

VL2

VW2

INTERFACE

AND

CONTROL

CIRCUITRY

8

DATA

R0 R1

VH1

WIPER

COUNTER RESISTOR

ARRAY

REGISTER

POT 1

(WCR)

R0 R1

VH3

WIPER

RESISTOR

COUNTER

ARRAY

REGISTER

POT 3

(WCR)

R2 R3

VL1

VW1

R2 R3

VL3

VW3

3864 ILL F07.1

漏 Xicor, Inc. 1994, 1995, 1996 Patents Pending

3864-2.7 7/1/96 T0/C3/D3 NS

1

Characteristics subject to change without notice

型號

版本

描述

廠商

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X9241

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