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8-Digit, Microprocessor-Compatible, LED

Display Decoder Driver

The Intersil ICM7228 display driver interfaces

microprocessors to an 8-digit, 7-segment, numeric LED

display. Included on chip are two types of 7-segment

decoder, multiplex scan circuitry, LED display segment

drivers, LED display digit drivers and an 8-byte static

memory as display RAM.

Data can be written to the ICM7228A and ICM7228B’s display

RAM in sequential 8-digit update or in single-digit update

format. Data is written to the ICM7228C display RAM in parallel

random access format. The ICM7228A and ICM7228C drive

common anode displays. The ICM7228B drives common

cathode displays. All versions can display the RAM data as

either Hexadecimal or Code B format. The ICM7228A and

ICM7228B incorporate a No Decode mode allowing each bit of

each digit's RAM word to drive individual display segments

resulting in independent control of all display segments. As a

result, bargraph and other irregular display segments and

formats can be driven directly by this chip.

The Intersil ICM7228 is an alternative to both the Maxim

ICM7218 and the Intersil ICM7218 display drivers. Notice that

the ICM7228A/B has an additional single digit access mode.

This could make the Intersil ICM7218A/B software incompatible

with ICM7228A/B operation.

Features

• Pb-Free Plus Anneal Available (RoHS Compliant)

• Improved 2nd Source to Maxim ICM7218

• Fast Write Access Time of 200ns

• Multiple Microprocessor Compatible Versions

• Hexadecimal, Code B and No Decode Modes

• Individual Segment Control with “No Decode” Feature

• Digit and Segment Drivers On-Chip

• Non-Overlapping Digits Drive

• Common Anode and Common Cathode LED Versions

• Low Power CMOS Architecture

• Single 5V Supply

Applications

• Instrumentation

• Test Equipment

• Hand Held Instruments

• Bargraph Displays

• Numeric and Non-Numeric Panel Displays

• High and Low Temperature Environments where LCD

Display Integrity is Compromised

FN3160.9

Data Sheet

August 19, 2015

ICM7228