X9CC102P [ETC]

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型号：	X9CC102P
厂家：	ETC
描述：	IC IC内部から
文件：	总9页 (文件大小：65K)
中文：	中文翻译
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APPLICATION NOTE

A V A I L A B L E

AN20 • AN42–53 • AN71 • AN73 • AN88 • AN91–92 • AN115

Terminal Voltages ±5V, 100 Taps

X9C102/103/104/503

Digitally-Controlled (XDCP) Potentiometer

FEATURES

DESCRIPTION

• Solid-State Potentiometer

• Three-Wire Serial Interface

• 100 Wiper Tap Points

—Wiper Position Stored in Nonvolatile Memory

and Recalled on Power-up

• 99 Resistive Elements

—Temperature Compensated

—End to End Resistance, ±20%

—Terminal Voltages, ±5V

• Low Power CMOS

The X9Cxxx are Xicor digitally-controlled (XDCP)

potentiometers. The device consists of a resistor array,

wiper switches, a control section, and nonvolatile

memory. The wiper position is controlled by a three-wire

interface.

The potentiometer is implemented by a resistor array

composed of 99 resistive elements and a wiper switching

network. Between each element and at either end are

tap points accessible to the wiper terminal. The position

of the wiper element is controlled by the CS, U/D, and

INC inputs. The position of the wiper can be stored in

nonvolatile memory and then be recalled upon a

subsequent power-up operation.

—V_CC= 5V

—Active Current, 3mA Max.

—Standby Current, 500µA Max.

• High Reliability

—Endurance, 100,000 Data Changes per Bit

—Register Data Retention, 100Years

• X9C102 = 1 kW

• X9C103 = 10 kW

• X9C503 = 50 kW

The device can be used as

potentiometer or as a two-terminal variable resistor in a

wide variety of applications including:

three-terminal

• control

• parameter adjustments

• signal processing

• X9C104 = 100 kW

• Packages

—8-Lead SOIC and DIP

FUNCTIONAL DIAGRAMS

U/D

INC

7-BIT

UP/DOWN

COUNTER

V_CC(Supply Voltage)

ONE 96

ONE-

HUNDRED

DECODER

Up/Down

(U/D)

R_H/V_H

7-BIT

NONVOLATILE

MEMORY

Increment

(INC)

Control

and

R_W/V_W

RESISTOR

ARRAY

Memory

TRANSFER

GATES

Device Select

(CS)

R_L/V_L

STORE AND

RECALL

CONTROL

CIRCUITRY

V_SS(Ground)

V_CC

GND

General

R /V

Detailed

E²POT^™is a trademark of Xicor, Inc. 11/5/98

©Xicor, Inc. 1994, 1995 Patents Pending

3863-2.4 2/12/99 T2/C0/D0 SH

Characteristics subject to change without notice

X9C102/103/104/503

PIN DESCRIPTIONS

R_H/V_Hand R_L/V_L

PIN CONFIGURATION

The high (V_H/R_H) and low (V_L/R_L) terminals of the

X9C102/103/104/503 are equivalent to the ﬁxed

DIP/SOIC

terminals of

mechanical potentiometer. The

INC

U/D

V_CC

minimum voltage is –5V and the maximum is +5V. The

terminology of V_H/R_Hand V /R references the relative

position of the terminal in r^Lela^Ltion to wiper movement

direction selected by the U/D input and not the voltage

potential on the terminal.

X9C102/103/104/503

V_H/R_H

V_L/R_L

V_W/R_W

V_SS

3863 FHD F02.2

R_W/V_W

V_W/R_Wis the wiper terminal, and is equivalent to the

movable terminal of a mechanical potentiometer. The

position of the wiper within the array is determined by the

control inputs. The wiper terminal series resistance is

typically 40W.

PIN NAMES

Symbol

Description

V_H/R_H

High Terminal

V_W/R_W

V_L/R_L

V_SS

Wiper Terminal

Low Terminal

Ground

Up/Down (U/D)

The U/D input controls the direction of the wiper

movement and whether the counter is incremented or

decremented.

V_CC

Supply Voltage

U/D

INC

Up/Down Control Input

Increment Control Input

Chip Select Control Input

No Connection

Increment (INC)

The INC input is negative-edge triggered. Toggling INC

will move the wiper and either increment or decrement

the counter in the direction indicated by the logic level on

the U/D input.

Chip Select (CS)

The device is selected when the CS input is LOW. The

current counter value is stored in nonvolatile memory

when CS is returned HIGH while the INC input is also

HIGH. After the store operation is complete the X9C102/

103/104/503 device will be placed in the low power

standby mode until the device is selected once again.

X9C102/103/104/503

PRINCIPLES OF OPERATION

The system may select the X9Cxxx, move the wiper, and

deselect the device without having to store the latest

wiper position in nonvolatile memory. After the wiper

movement is performed as described above and once

the new position is reached, the system must keep INC

LOW while taking CS HIGH. The new wiper position will

be maintained until changed by the system or until a

power-down/up cycle recalled the previously stored data.

There are three sections of the X9Cxxx: the input control,

counter and decode section; the nonvolatile 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 nonvolatile memory and retained for future use.

The resistor array is comprised of 99 individual resistors

connected in series. At either end of the array and

between each resistor is an electronic switch that

transfers the potential at that point to the wiper.

This procedure allows the system to always power-up to

a preset value stored in nonvolatile memory; then during

system operation minor adjustments could be made.The

adjustments might be based on user preference: system

parameter changes due to temperature drift, etc...

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.

The state of U/D may be changed while CS remains

LOW. This allows the host system to enable the device

and then move the wiper up and down until the proper

trim is attained.

The electronic switches on the device operate in a “make

before break” mode when the wiper changes tap

positions. If the wiper is moved several positions, multiple

taps are connected to the wiper for t_IW(INC to V_W

change). The R_TOTALvalue for the device can temporarily

be reduced by a signiﬁcant amount if the wiper is moved

several positions.

MODE SELECTION

INC

U/D

Mode

Wiper Up

Wiper Down

Store Wiper Position

Standby Current

When the device is powered-down, the last wiper

position stored will be maintained in the nonvolatile

memory. When power is restored, the contents of the

memory are recalled and the wiper is set to the value last

stored.

No Store, Return to Standby

SYMBOL TABLE

WAVEFORM

INPUTS

OUTPUTS

INTRUCTIONS AND PROGRAMMING

Must be

steady

Will be

steady

The INC, U/D and CS inputs control the movement of the

wiper along the resistor array. With CS set LOW the

device is selected and enabled to respond to the U/D and

INC inputs. HIGH to LOW transitions on INC will

increment or decrement (depending on the state of the

U/D input) a seven-bit counter. The output of this counter

is decoded to select one of one-hundred wiper positions

along the resistive array.

May change

from Low to

High

Will change

from Low to

High

May change

from High to

Low

Will change

from High to

Low

Don’t Care:

Changes

Allowed

Changing:

State Not

Known

The value of the counter is stored in nonvolatile memory

whenever CS transistions HIGH while the INC input is

also HIGH.

N/A

Center Line

is High

Impedance

X9C102/103/104/503

ABSOLUTE MAXIMUM RATINGS*

*COMMENT

Temperature under Bias.........................–65°C to +135°C

Storage Temperature..............................–65°C to +150°C

Stresses above those listed under “Absolute Maximum

Ratings” may cause permanent damage to the device.

This is a stress rating only and the functional operation

of the device at these or any other conditions above

those listed in the operational sections of this speciﬁcation

is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

Voltage on CS, INC, U/D and V

with Respect to V_SS....................................... –1V to +7V

Voltage on V_Hand V_L

Referenced to V ........................................ –8V to +8V

DV = |V_H–V_L|

X9C102 ......................................................................4V

X9C103, X9C503, and X9C104...............................10V

Lead Temperature (Soldering, 10 seconds)..........+300°C

RECOMMENDED OPERATING CONDITIONS

Temperature

Commercial

Industrial

Min.

0°C

Max.

+70°C

+85°C

+125°C

Supply Voltage (V_CC)

Limits

X9C102/103/104/503

5V ±10%

3863 PGM T04.2

–40°C

–55°C

Military

3863 PGM T03.1

POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)

Limits

Symbol

Parameter

Min.

Typ.

Max. Units

Test Conditions/Notes

R_TOTAL

End to End Resistance Variation

–20

+20

V_VH

V_VL

V_HTerminal Voltage

V_LTerminal Voltage

–5

Power Rating

Wiper Current

±1

X9C102

X9C103/104/503

I_W

R_W

Wiper Resistance

100

Wiper Current = ±1mA

Ref. 1kHz

Noise

–120

dBV

Resolution

Absolute Linearity⁽¹⁾

M⁽³⁾

–1

V_W(n)(actual)– V_{W(n)(expected)}

Relative Linearity⁽²⁾

MI⁽³⁾

–0.2

+0.2

V_{W(n + 1)(actual)}– [V_{W(n) + MI}]

RTOTAL Temperature Coefficient

Ratiometric Temperature Coefficient

Potentiometer Capacitances

±300

±600

ppm/°C X9C103/503/104

ppm/°C X9C102

±20 ppm°C

C_H/C_L/C_W

10/10/25

see circuit #3

Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage = [V_W(n)(actual)– V_{W(n)(expected )}] = ±1 MI Maximum.

(2) Relative Linearity is a measure of the error in step size between taps = V_{W(n + 1)}– [V_{W(n) + MI}] = +0.2 MI.

(3) 1 MI = Minimum Increment = R_TOT/99

(4) Typical values are for T = 25°C and nominal supply voltage.

(5) This parameter is periodically sampled and not 100% tested.

X9C102/103/104/503

D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)

Limits

Symbol

Parameter

Min.

Typ.⁽⁴⁾Max. Units

Test Conditions

CS = V , U/D = V or V_IHand

I_CC

V_CCActive Current

µA

INC = 0.4V to 2.4V @ max. t_CYC

I_SB

I_LI

CS = V_CC– 0.3V, U/D and INC = V_SS

or V_CC– 0.3V

Standby Supply Current

200

500

±10

V_IN= V_SSto V_CC

CS, INC, U/D Input

Leakage Current

V_IH

V_IL

V_CC+ 1

CS, INC, U/D Input HIGH

Voltage

–1

0.8

CS, INC, U/D Input LOW

Voltage

(2)

V_CC= 5V, V_IN= V_SS, T_A= 25°C, f = 1MHz

C_IN

CS, INC, U/D Input

Capacitance

ENDURANCE AND DATA RETENTION

Parameter

Minimum Endurance

Data Retention

Min.

Units

Data Changes per Bit

Years

100,000

100

Test Circuit #1

Test Circuit #2

Test Circuit #3

V_H/R_H

V_R/R_H

R_TOTAL

R_H

TEST POINT

R_L

C_L

10pF

C_H

10pF

V _S

TEST POINT

V_W/R_W

C_W

FORCE

CURRENT

25pF

V_L/R_L

R_W

X9C102/103/104/503

A.C. CONDITIONS OF TEST

Input Pulse Levels

0V to 3V

10ns

Input Rise and Fall Times

Input Reference Levels

1.5V

A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)

Limits

Symbol

t_Cl

Parameter

CS to INC Setup

Min.

100

2.9

Typ.⁽⁶⁾

Max.

Units

t_lD

INC HIGH to U/D Change

U/D to INC Setup

t_DI

µs

t_lL

INC LOW Period

µs

t_lH

INC HIGH Period

µs

t_lC

INC Inactive to CS Inactive

CS Deselect Time (STORE)

CS Deselect Time (NO STORE)

INC to V_WChange

µs

t_CPH

t_IW

t_CYC

100

500

µs

INC Cycle Time

µs

(7)

INC Input Rise and Fall Time

Power up to Wiper Stable

V_CCPower-up Rate

500

µs

t_R

(7)

t_PU

t_RV_CC

(7)

0.2

V/ms

A.C. TIMING

t_CYC

t_CI

t_IL

t_IH

t_IC

t_CPH

90% 90%

10%

INC

t_ID

t_DI

t_F

t_R

U/D

V_W

t_IW

(8)

Notes: (6) Typical values are for T_A= 25°C and nominal supply voltage.

(7) This parameter is periodically sampled and not 100% tested.

(8) MI in the A.C. timing diagram refers to the minimum incremental change in the V_Woutput due to a change in the wiper position.

X9C102/103/104/503

PERFORMANCE CHARACTERISTICS

Contact the factory for more information.

APPLICATIONS INFORMATION

Electronic digitally-controlled (XCDP) potentiometers provide three powerful application advantages; (1) the variability

and reliability of a solid-state potentiometer, (2) the ﬂexibility of computer-based digital controls, and (3) the retentivity of

nonvolatile memory used for the storage of multiple potentiometer settings or data.

Basic Configurations of Electronic Potentiometers

V_R

V_H

V_W

V_L

Three terminal potentiometer;

Two terminal variable resistor;

variable voltage divider

variable current

Basic Circuits

Noninverting Amplifier

Buffered Reference Voltage

Cascading Techniques

+5V

R₁

LM308A

V_S

–

V_O

+5V

V_W

OP-07

–

–5V

V_REF

V_OUT

V_W

R₂

–5V

V_OUT= V_W

R₁

V_W

(a)

(b)

V_O= (1+R₂/R₁)V_S

Voltage Regulator

Offset Voltage Adjustment

Comparator with Hysterisis

LT311A

R₁

R₂

V_S

–

V_S

V_O

V_IN

V_O(REG)

317

100KW

R₁

–

V_O

I_adj

TL072

R₁

R₂

10KW

+12V

V_UL= {R₁/(R₁+R₂)} V_O(max)

_LL= {R₁/(R₁+R₂)} V_O(min)

10KW

-12V

V_O(REG) = 1.25V (1+R₂/R₁)+I_adjR₂

(for additional circuits see AN115)

X9C102/103/104/503

PACKAGING INFORMATION

8-LEAD PLASTIC DUAL

8-LEAD PLASTIC DUAL SMALL

IN-LINE PACKAGE TYPE P

OUTLINE GULL WING PACKAGE TYPE S

0.430 (10.92)

0.360 (9.14)

0.092 (2.34)

DIA. NOM

0.150 (3.80)

0.158 (4.00)

0.228 (5.80)

0.244 (6.20)

0.255 (6.47)

PIN 1

0.245 (6.22)

INDEX

PIN 1 INDEX

PIN 1

0.060 (1.52)

0.020 (0.51)

0.300

(7.62) REF.

0.014 (0.35)

0.019 (0.49)

HALF SHOULDER

WIDTH ON ALL

END PINS OPTIONAL

0.188 (4.78)

0.197 (5.00)

0.140 (3.56)

0.130 (3.30)

(4X) 7°

SEATING

PLANE

0.053 (1.35)

0.069 (1.75)

0.020 (0.51)

0.015 (0.38)

0.150 (3.81)

0.125 (3.18)

0.062 (1.57)

0.0585 (1.47)

0.004 (0.19)

0.010 (0.25)

0.050 (1.27)

0.110 (2.79)

0.090 (2.29)

0.020 (0.51)

0.016 (0.41)

0.010 (0.25)

0.020 (0.50)

X 45°

0.015 (0.38)

MAX.

0.325 (8.25)

0.300 (7.62)

0° – 8°

0.0075 (0.19)

0.010 (0.25)

0°

TYP 0.010 (0.25)

15°

0.027 (0.683)

0.037 (0.937)

NOTE:

1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)

2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH

X9C102/103/104/503

ORDERING INFORMATION

X9Cxxx

Temperature Range

Blank = Commercial = 0°C to +70°C

I = Industrial = –40°C to +85°C

M = Military = –55°C to +125°C

Package

P = 8-Lead Plastic DIP

S = 8-Lead SOIC

End to End Resistance

102 = 1 kW

103 = 10 kW

104 = 100 kW

503 = 50 kW

Physical Characteristics

Marking Includes:

• Manufacturer’s Trademark

• Resistance Value or Code

• Date Code

LIMITED WARRANTY

Devices sold by Xicor, Inc. are covered by the warranty and patent indemniﬁcation provisions appearing in its Terms of Sale only. Xicor, Inc.

makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the

described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or ﬁtness for any purpose. Xicor, Inc. reserves the

right to discontinue production and change speciﬁcations and prices at any time and without notice.

Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents,

licenses are implied.

U.S. PATENTS

Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 4,326,134; 4,393,481;

4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829, 482; 4,874, 967;

4,883, 976. Foreign patents and additional patents pending.

LIFE RELATED POLICY

In situations where semiconductor component failure may endanger life, system designers using this product should design the system with

appropriate error detection and correction, redundancy and back-up features to prevent such an occurence.

Xicor’s products are not authorized for use in critical components in life support devices or systems.

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain

life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably

expected to result in a signiﬁcant injury to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the

failure of the life support device or system, or to affect its safety or effectiveness.

X9CC102P [ETC]

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