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參數(shù)資料
| 型號： | ICM7218 |
| 廠商： | Intersil Corporation |
| 英文描述： | 8-Digit LED Microprocessor-Compatible Multiplexed Display Decoder Driver(8位數(shù)字LED顯示驅(qū)動器) |
| 中文描述： | 8位、復(fù)用輸出、LED解碼驅(qū)動器 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 252K |
| 代理商： | ICM7218 |
6
FN3159.2
February 15, 2007
Inter Digit Blanking
A blanking time of approximately 10
μ
s occurs between digit
strobes. This ensures that the segment information is correct
before the next digit drive, thereby avoiding display ghosting.
Driving Larger Displays
If a higher average drive current per digit is required, it is
possible to connect digit drive outputs together. For example,
by paralleling pairs of digit drivers together to drive a 4 digit
display, 5mA average segment drive current can be obtained.
Power Dissipation Considerations
Assuming common anode drive at V
DD
= 5V and all digits on
with an average of 5 segments driven per digit, the average
current would be approximately 200mA. Assuming a 1.8V
drop across the LED display, there will be a 3.2V drop across
the ICM7218. The device power dissipation will therefore be
640mW, rising to about 900mW, for all ‘8’ ‘s displayed.
Caution: Position device in system such that air can
flow freely to provide maximum cooling. The common
cathode dissipation is approximately one-half that of the
common anode dissipation.
Sequential Addressing Considerations
(lCM7218A/B)
The control instructions are read from the input bus lines if
MODE is high and WRITE low. The instructions occur on 4
lines and are - DECODE/no Decode, type of Decode (if
desired), SHUTDOWN/no Shutdown and DATA COMlNG/not
Coming. After the control word has been written (with the Data
Coming instruction), display data can be written into memory
with each successive negative going WRITE pulse. After all
8-digit memory locations have been written to, additional
transitions of the WRITE input are ignored until a new control
word is written. It is not possible to change one individual digit
without refreshing the data for all the other digits.
Random Access Input Drive Considerations
(ICM7218C/D)
Control instructions are provided to the ICM7218C/D by a
single three level input terminal (Pin 9), which operates
independently of the WRITE pulse.
Data can be written into memory on the lCM7218C/D by
setting up a 3 bit binary code (one of eight) on the digit
address inputs and applying a low level to the WRITE pin.
For example, it is possible to change only digit 7 without
altering the data for the other digits. (See Figure 6).
Supply Capacitor
A 0.1
μ
F plus a 47
μ
F capacitor is recommended between
V
DD
and V
SS
to bypass display multiplexed noise.
FIGURE 4. TIMING DIAGRAM FOR ICM7218A/B
FIGURE 5. LOAD SEQUENCE ICM7218A/B
ICM7218
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| ICM72188IPI | 制造商:Maxim Integrated Products 功能描述: |
| ICM7218A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC |
| ICM7218AI/D | 功能描述:LED顯示驅(qū)動器 RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| ICM7218AIJI | 功能描述:LED顯示驅(qū)動器 DISPLAY 8 DIG LED DRIVER 28CDIP IND RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| ICM7218AIJI+ | 功能描述:LED顯示驅(qū)動器 RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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