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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
FN3160.9Data Sheet August 19, 2015
ICM7228
