7228AIBIZ データシートの表示（PDF） - Renesas Electronics
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7228AIBIZ Datasheet PDF : 19 Pages
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ICM7228
The display formats of the ICM7228A/B are selected by writing
data to bits ID4, ID5 and ID6 of the Control Register (See
Table 1 and 2 for input Definitions). Hexadecimal and Code B
data is entered via ID0-lD3 and ID7 controls the decimal point.
TABLE 5. DISPLAY CHARACTER SETS
INPUT DATA CODE
DISPLAY CHARACTERS
ID3 ID2 ID1 ID0 HEXADECIMAL CODE B
0
0
0
0
0
0
0
0
0
1
1
1
0
0
1
0
2
2
0
0
1
1
3
3
0
1
0
0
4
4
0
1
0
1
5
5
TABLE 5. DISPLAY CHARACTER SETS (Continued)
INPUT DATA CODE
DISPLAY CHARACTERS
ID3 ID2 ID1 ID0 HEXADECIMAL CODE B
0
1
1
0
6
6
0
1
1
1
7
7
1
0
0
0
8
8
1
0
0
1
9
9
1
0
1
0
A
-
1
0
1
1
b
E
1
1
0
0
C
H
1
1
0
1
d
L
1
1
1
0
E
P
1
1
1
1
F
(Blank)
I/O OR
MEMORY
WRITE PULSE
A3 - A15
DATA BUS D0 - D7
5
DECODER
ENABLE
ADDRESS
DECODER
DEVICE SELECT
AND
WRITE PULSE
ID0 - ID3
AND ID7
INTERSIL
ICM7228C
SEGMENTS
WRITE
DRIVE
A0 - A2
DA0 - DA2
DIGITS
DRIVE
ADDRESS BUS A0 - A15
LED DISPLAY
FIGURE 10. ICM7228C MICROPROCESSOR SYSTEM INTERFACING
a
fb
g
ec
d
DP
FIGURE 11. DIGITS SEGMENT ASSIGNMENTS
The No Decode mode of the ICM7228A and ICM7228B allows
the direct segment-by-segment control of all 64 segments
driven by the device. In the No Decode mode, the input data
directly control the outputs as shown in Table 6.
TABLE 6. NO DECODE SEGMENT LOCATIONS
DATA
INPUT
ID7
ID6 ID5 ID4 ID3 ID2 ID1 ID0
Controlled Decimal a b c e g f d
Segment
Point
An input high level turns on the respective segment, except for
the decimal point, which is turned on by an input low level on
ID7.
FN3160 Rev 9.00
August 19, 2015
The No Decode mode can be used in different applications
such as bar graph or status panel driving where each segment
controls an individual LED.
The ICM7228C has only the Hexadecimal and Code B
character sets. The HEXA/CODE B/SHUTDOWN input, pin 9,
requires a three level input. Pin 9 selects the Hexadecimal
format when pulled high, the Code B format when floating or
driven to mid-supply, and the shutdown mode when pulled low
(See Table 3). Table 5 also applies to the ICM7228C.
Shutdown and Display Banking
When shutdown, the ICM7228 enters a low power standby
mode typically consuming only 1A of supply current for the
ICM7228A/B and 2.5A for the ICM7228C. In this mode the
ICM7228 turns off the multiplex scan oscillator as well as the
digit and segment drivers. However, input data can still be
entered when in the shutdown mode. Data is retained in
memory even with the supply voltage as low as 2V.
The ICM7228A/B is shutdown by writing a control word with
Shutdown (lD4) low. The ICM7228C is put into shutdown mode
by driving pin 9, HEXA/CODE B/SHUTDOWN, low.
Page 13 of 19
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