1

®

FN3159.2

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

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Copyright © Intersil Americas Inc. 2001, 2007. All Rights Reserved

ICM7218

8-Digit LED Microprocessor-Compatible

Multiplexed Display Decoder Driver

The ICM7218 series of universal LED driver systems

provide, in a single package, all the circuitry necessary to

interface most common microprocessors or digital systems

to an LED display. Included on chip are an 8-byte static

display memory, two types of 7-segment decoders, multiplex

scan circuitry, and high current digit and segment drivers for

either common-cathode or common-anode displays.

The lCM7218A and 1CM7218B feature two control lines

(WRITE and MODE) which write either 4 bits of control

information (DATA COMING, SHUTDOWN, DECODE, and

HEXA/CODE B) or 8 bits of display input data. Display data

is automatically sequenced into the 8-byte internal memory

on successive positive going WRITE pulses. Data may be

displayed either directly or decoded in Hexadecimal or Code

B formats.

The ICM7218C and lCM7218D feature two control lines

(WRITE and HEXA/CODE B/SHUTDOWN), 4 separate

display data input lines, and 3 digit address lines. Display

data is written into the internal memory by setting up a digit

address and strobing the WRITE line low. Only Hexadecimal

and Code B formats are available for display outputs.

Features

• Microprocessor Compatible

• Total Circuit Integration On Chip Includes:

- Digit and Segment Drivers

- All Multiplex Scan Circuitry

- 8-Byte Static Display Memory

- 7-Segment Hexadecimal and Code B Decoders

• Output Drive Suitable for LED Displays Directly

• Common Anode and Common Cathode Versions

• Single 5V Supply Required

• Data Retention to 2V Supply

• Shutdown Feature - Turns Off Display and Puts Chip Into

Low Power Dissipation Mode

• Sequential and Random Access Versions

• Decimal Point Drive On Each Digit

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

MULTIPLEX

OSCILLATOR

INTERDIGIT

BLANKING

8-DIGIT

DRIVERS

8-SEGMENT

DRIVERS

DECIMAL

POINT

7

7

1

3

DECODE/

NO-DECODE

HEXADECIMAL/

CODE B

DECODER

7

1

8

8

8

8

8

1

1

7

4

7

1

1

1

1

1

4

8

4

8

8

11

8

8

1

1

1

5

5

3

1

HEXADECIMAL/

CODE B

DECODER

MULTIPLEX

OSCILLATOR

8-DIGIT

DRIVERS

8-SEGMENT

DRIVERS

DECIMAL

POINT

INTERDIGIT

BLANKING

READ

ADRESS, DIGIT

MULTIPLEXER

READ

ADRESS

MULTIPLEXER

WRITE

ADDRESS

DECODER

WRITE ADDRESS

COUNTER

CONTROL

LOGIC

8-BYTE

STATIC

RAM

8-BYTE

STATIC

RAM

THREE LEVEL

INPUT LOGIC

SHUTDOWN

DECODE

HEXA/CODE B

SHUTDOWN

ID0-ID7

INPUT

DATA

ID4-ID7

CONTROL

INPUTS

MODE

WRITE

HEXADECIMAL/

CODE B/

SHUTDOWN

WRITE

ID0-ID3

INPUT

DATA

ID7

DA0-DA2

DIGIT

ADDRESS

ICM7218C COMMON ANODE

ICM7218D COMMON CATHODE

ICM7218A COMMON ANODE

ICM7218B COMMON CATHODE

FIGURE 1. FUNCTIONAL DIAGRAMS

Data Sheet

February 15, 2007