1
DATASHEET
8-Digit LED Microprocessor-Compatible Multiplexed
Display Decoder Driver
ICM7218
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
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2001, 2007, 2015, 2016. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
May 17, 2016
FN3159.4
