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參數(shù)資料
| 型號： | ICM7228CIPIZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 8-Digit, Microprocessor-Compatible, LED Display Decoder Driver |
| 中文描述： | LED DISPLAY DRIVER, PDIP28 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-011AB, DIP-28 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 310K |
| 代理商： | ICM7228CIPIZ |
15
ICM7228
Three Level Input, ICM7228C
As mentioned before, pin 9 is a three level input and controls
three functions: Hexadecimal display decoding, Code B
display decoding and shutdown mode. In many applications,
pin 9 will be left open or permanently wired to one state. When
pin 9 can not be permanently left in one state, the circuits
illustrated in Figure 17 can be used to drive this three level
input.
Power Supply Bypassing
Connect a minimum of 47
μ
F in parallel with 0.1
μ
F capacitors
between V
DD
and V
SS
of ICM7228. These capacitors
should be placed in close proximity to the device to reduce
the power supply ripple caused by the multiplexed LED
display drive current pulses.
V
DD
1.4A
PEAK
ICM7228B
100
SEGMENT
OUTPUT
300
DIGIT
OUTPUT
N
V
SS
≈
15
1K
2N2219
(100mA
PEAK
)
25
2N6034
1K
V
DD
V
SS
1K
V
DD
V
DD
FIGURE 16. DRIVING HIGH CURRENT DISPLAY, COMMON
CATHODE ICM7228B TO COMMON ANODE
DISPLAY
HIGH = HEX
LOW = SHUTDOWN
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = HEX
LOW = SHUTDOWN
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = CODE B
LOW = HEX
HIGH = SHUTDOWN
LOW = CODE B
HIGH = SHUTDOWN
LOW = HEX
HIGH = SHUTDOWN
LOW = CODE B
PIN 9
PIN 9
PIN 9
PIN 9
PIN 9
PIN 9
CD4016
CD4066
CONTROL
CD4069
CD4069
CD4069
1N4148
1N4148
OPEN DRAIN OR OPEN
COLLECTOR OUTPUT
74C126 THREE-STATE BUFFER
FIGURE 17. ICM7228C PIN 9 DRIVE CIRCUITS
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