X9221WS 판매점 - Dual E2POT Nonvolatile Digital Potentiometer

X9221WS 반도체 회로 부품 판매점

Dual E2POT Nonvolatile Digital Potentiometer

Xicor

APPLICATION NOTES

AVA I L A B L E

AN20 • AN42 • AN44–48 • AN50 • AN52 • AN53 • AN73

XATed9vr2ma2n1icneaIlnVfoormltaatgioen±5V, 64 Taps

X9221

Dual E2POT™ Nonvolatile Digital Potentiometer

FEATURES

• Two E2POTs in One Package

• Two-Wire Serial Interface

• Register Oriented Format

—Directly Write Wiper Position

—Read Wiper Position

—Store as Many as Four Positions per Pot

• Instruction Format

—Quick Transfer of Register Contents to

Resistor Array

• Low Power CMOS

• Direct Write Cell

—Endurance - 100,000 Writes per Register

—Register Data Retention - 100 years

• 8 Bytes of E2PROM memory

• 3 Resistor Array Values

—2KΩ to 50KΩ Mask Programmable

• Resolution: 64 Taps each Pot

• 20-Lead Plastic DIP and 20-Lead SOIC Packages

DESCRIPTION

The X9221 integrates two nonvolatile E2POT™ digitally

controlled potentiometers on a monolithic CMOS micro-

circuit.

The X9221 contains two 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

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.

FUNCTIONAL DIAGRAM

SCL

SDA

INTERFACE

AND

CONTROL

CIRCUITRY

DATA

R0 R1

WIPER

COUNTER

R2 R3 (WCR)

VH0

VL0

VW0

R0 R1 WIPER

COUNTER RESISTOR

R2 R3 (WCR)

POT 1

VH1

VL1

VW1

3079 ILL F07.1

3079-1.6 6/12/96 T1/C1/D0 NS

Characteristics subject to change without notice

X9221

PIN DESCRIPTIONS

Host Interface Pins

Serial Clock (SCL)

The SCL input is used to clock data into and out of the

X9221.

Serial Data (SDA)

SDA is a bidirectional pin used to transfer data into and

out of the device. It is an open drain output and may be

wire-ORed with any number of open drain or open

collector outputs. An open drain output requires the use

of a pull-up resistor. For selecting typical values, refer

to the guidelines for calculating typical values on the

bus pull-up resistors graph.

Address

The Address inputs are used to set the least significant

4 bits of the 8-bit slave address. A match in the slave

address serial data stream must be made with the

Address input in order to initiate communication with the

X9221

Potentiometer Pins

VH (VH0 – VH1), VL (VL0 – VL1)

The VH and VL inputs are equivalent to the terminal

connections on either end of a mechanical potentiom-

eter.

VW (VW0 – VW1)

The wiper outputs are equivalent to the wiper output of

a mechanical potentiometer.

PIN CONFIGURATION

DIP/SOIC

VW0

VL0

VH0

VW1

VL1

VH1

SDA

VSS

1 20

2 19

3 18

4 17

5 16

X9221

6 15

7 14

8 13

9 12

10 11

VCC

RES

SCL

RES

3079 ILL F01.1

PIN NAMES

Symbol

SCL

SDA

A0–A3

VH0–VH1, VL0–VL1

VW0–VW1

RES

Description

Serial Clock

Serial Data

Address

Potentiometers

(terminal equivalent)

Potentiometers

(wiper equivalent)

Reserved (Do not connect)

3079 PGM T01

PRINCIPLES OF OPERATION

The X9221 is a highly integrated microcircuit incorporat-

ing two resistor arrays, their associated registers and

counters and the serial interface logic providing direct

communication between the host and the E2POT poten-

tiometers.

Serial Interface

The X9221 supports a bidirectional bus oriented proto-

col. The protocol defines any device that sends data

onto the bus as a transmitter and the receiving device as

the receiver. The device controlling the transfer is a

master and the device being controlled is the slave. The

master will always initiate data transfers and provide the

clock for both transmit and receive operations. There-

fore, the X9221 will be considered a slave device in all

applications.

Clock and Data Conventions

Data states on the SDA line can change only during SCL

LOW periods (tLOW). SDA state changes during SCL HIGH

are reserved for indicating start and stop conditions.

Start Condition

All commands to the X9221 are preceded by the start

condition, which is a HIGH to LOW transition of SDA

while SCL is HIGH (tHIGH). The X9221 continuously

monitors the SDA and SCL lines for the start condition

and will not respond to any command until this condition

is met.

Stop Condition

All communications must be terminated by a stop con-

dition, which is a LOW to HIGH transition of SDA while

SCL is HIGH.

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국내 전력반도체 판매점

상호 : 아이지 인터내셔날

전화번호 : 051-319-2877

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X9221WS 반도체 회로 부품 판매점

Dual E2POT Nonvolatile Digital Potentiometer

국내 전력반도체 판매점

일반적인 전자부품 판매점

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