ICM7218 查看數據表（PDF） - Renesas Electronics
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ICM7218 Datasheet PDF : 14 Pages
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DATASHEET
ICM7218
8-Digit LED Microprocessor-Compatible Multiplexed Display Decoder Driver
FN3159
Rev 4.00
May 17, 2016
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)”
ID0-ID7
INPUT
DATA
8
ICM7218A COMMON ANODE
ICM7218B COMMON CATHODE
ID4-ID7 MODE WRITE
8 CONTROL
INPUTS
4
1
1
DECODE
CONTROL
SHUTDOWN
HEXA/CODE B
LOGIC
1
8
1
8-BYTE
WRITE ADDRESS
1
STATIC
8
COUNTER
RAM
1
1
7
8
READ
ADRESS, DIGIT
4
MULTIPLEXER
HEXADECIMAL/
CODE B
7
DECODER
7
3
MULTIPLEX
OSCILLATOR
DECODE/
1
NO-DECODE
7
DECIMAL
POINT
8-SEGMENT
DRIVERS
1
8
8-DIGIT
DRIVERS
INTERDIGIT
BLANKING
ICM7218C COMMON ANODE
ICM7218D COMMON CATHODE
ID0-ID3
HEXADECIMAL/ ID7
CODE B/
SHUTDOWN
DATA
INPUT
1
5
WRITE
1
DA0-DA2
DIGIT
ADDRESS
3
THREE LEVEL 1
INPUT LOGIC
SHUTDOWN
1
8-BYTE
STATIC
RAM
4
WRITE
8
ADDRESS
DECODER
8
8
READ
ADRESS
MULTIPLEXER
HEXADECIMAL/
CODE B
DECODER
1
8
7
DECIMAL
POINT
5
MULTIPLEX
OSCILLATOR
1 INTERDIGIT
BLANKING
8-SEGMENT
DRIVERS
8-DIGIT
DRIVERS
FIGURE 1. FUNCTIONAL DIAGRAMS
FN3159 Rev 4.00
May 17, 2016
Page 1 of 14
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