数字电位器X9511资源-CSDN文库

X9511

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Terminal Voltage

5V, 32 Taps



Xicor, Inc. 1994, 1995, 1996 Patents Pending

3067-3.5 8/9/97 T2/C0/D0 NS

Characteristics subject to change without notice

PushPot



Potentiometer (Push Button Controlled)

FEATURES

• Push Button Controlled

• Low Power CMOS

—Active Current, 3mA Max

—Standby Current, 200

A Max

• 31 Resistive Elements

—Temperature Compensated

—

20% End to End Resistance Range

—–5V to +5V Range

• 32 Wiper Tap Points

—Wiper Positioned via Two Push Button Inputs

—Slow & Fast Scan Modes

—AUTOSTORE



Option

—Manual Store Option

—Wiper Position Stored in Nonvolatile Memory

and Recalled on Power-Up

• 100 Year Wiper Position Data Retention

• X9511Z = 1K

Ω

• X9511W = 10K

Ω

• Packages

—8-Lead PDIP

—8-Lead SOIC

DESCRIPTION

The Xicor X9511 is a push button controlled, potentiom-

eter and is ideal for push button controlled resistance

trimming.

The X9511 is a resistor array composed of 31 resistive

elements. Between each element and at either end are

tap points accessible to the wiper element. The position

of the wiper element is controlled by the PU

and PD

inputs. The position of the wiper can be automatically

stored in E

memory and then be recalled upon a subse-

quent power-on operation.

The resolution of the X9511 is equal to the maximum

resistance value divided by 31. As an example, for the

X9511W (10K

Ω

) each tap point represents 323

Ω

All Xicor nonvolatile products are designed and tested for

applications requiring extended endurance and data

retention.

FUNCTIONAL DIAGRAM

3067 ILL F01.1

5-BIT

UP/DOWN

COUNTER

5-BIT

EEPROM

MEMORY

STORE AND

RECALL

CONTROL

CIRCUITRY

ONE

THIRTY-

TWO

DECODER

RESISTOR

ARRAY

ASE

TRANSFER

GATES

X9511

AUTOSTORE is a registered trademark of Xicor, Inc.

POT



and PushPot



are trademarks of Xicor, Inc.

PPLICATION

OTES

AVAILABLE

AN42 • AN44–48 • AN50 • AN52 • AN53 • AN73

X9511

DEVICE OPERATION

There are three sections of the X9511: the input control,

counter and decode section; the E

PROM memory; and

the resistor array. The input control section operates just

like an up/down counter. The output of this counter is

decoded to turn on a single electronic switch connecting

a point on the resistor array to the wiper output. Under

the proper conditions the contents of the counter can be

stored in E

PROM memory and retained for future use.

The resistor array is comprised of 31 individual resistors

connected in series. At either end of the array and

between each resistor is an electronic switch that trans-

fers the potential at that point to the wiper.

The X9511 is designed to interface directly to two push

button switches for effectively moving the wiper up or

down. The PU

and PD inputs increment or decrement a

5-bit counter respectively. The output of this counter is

decoded to select one of the thirty-two wiper positions

along the resistive array. The wiper increment input, PU

and the wiper decrement input, PD are both connected

to an internal pull-up so that they normally remain HIGH.

When pulled LOW by an external push button switch or a

logic LOW level input, the wiper will be switched to the

next adjacent tap position.

Internal debounce circuitry prevents inadvertent switch-

ing of the wiper position if PU or PD remain LOW for less

than 40ms, typical. Each of the buttons can be pushed

either once for a single increment/decrement or continu-

ously for a multiple increments/decrements. The number

of increments/decrements of the wiper position depend

on how long the button is being pushed. When making a

continuous push, after the ﬁrst second, the increment/

decrement speed increases. For the ﬁrst second the

device will be in the slow scan mode. Then if the button is

held for longer than 1 second the device will go into the

fast scan mode. As soon as the button is released the

X9511 will return to a standby condition.

The wiper, when at either ﬁxed terminal, acts like its

mechanical equivalent and does not move beyond the

last position. That is, the counter does not wrap around

when clocked to either extreme.

AUTOSTORE

The value of the counter is stored in E

PROM memory

whenever the chip senses a power-down of V

while

ASE

is enabled (held LOW). When power is restored, the

content of the memory is recalled and the counter reset

to the last value stored.

If AUTOSTORE is to be implemented, ASE is typically

hard wired to V

. If ASE

is held HIGH during power-up

and then taken LOW, the wiper will not respond to the PU

or PD inputs until ASE is brought HIGH and held HIGH.

Manual (Push Button) Store

When ASE is not enabled (held HIGH) a push button

switch may be used to pull ASE LOW and released to

perform a manual store of the wiper position.

TOTAL

with V

Removed

The end to end resistance of the array will ﬂuctuate once

is removed.

Typical circuit with ASE

store pin controlled by

push button switch

ASE

3067 ILL F05a

Typical circuit with ASE

store pin used in

AUTOSTORE mode

ASE

3.3µF

3067 ILL F05.2

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