參數(shù)資料
型號(hào)： MM74C911
廠商： Fairchild Semiconductor Corporation
英文描述： Simplified Multi-Digit LED Display Controller(多數(shù)字式LED顯示控制器)
中文描述： 簡(jiǎn)化的多位LED顯示控制器（多數(shù)字式的LED顯示控制器）
文件頁(yè)數(shù)： 10/26頁(yè)
文件大?。?/td> 639K
代理商： MM74C911
V. MM74C911 DISPLAY APPLICATIONS
Of the three CMOS display controllers, the MM74C911 is the
simplest, but also the most versatile. Since the character font
is not predetermined, many non-numerical characters can
be displayed using standard 8-segment displays. In many
cases, it may be desirable to enable a small microprocessor
to display prompt messages where the use of more compli-
cated alpha-numeric displays is not justified. For these
cases, the MM74C911 is ideal, because any combination of
segments can be controlled. Figure 17 shows many of the
possible letters and numbers that can be displayed along
with their binary and hexadecimal values on 8-segment dis-
plays.
There
is
no
reason
to
restrict
alpha-numeric displays, as the controller allows direct con-
trol of individual LEDs. The MM74C911 can be connected to
a mixture of numerical and discrete LEDs as typified by Fig-
ure 18 Thus status and numerical data can be simulta-
neously controlled.
Taking this one step further, all the LEDs could be discrete as
shown in Figure 19 This type of arrangement is multipur-
pose. The LEDs could be configured as a 4 x 8 matrix or pos-
sible two-bar graphs of 16 LEDs, Figure 20 or maybe some
sort of binary data display. There are many variations pos-
sible.
the
MM74C911
to
VI. SLAVING THE MM74C911
As mentioned, the MM74C911 has the unique feature of be-
ing able to be slaved to external multiplex logic or a “master”
MM74C911. This feature is useful when the controller is to
be synchronized with a master. Figure 21shows a typical ap-
plication where two MM74C911s are used to drive a
16-segment alpha-numeric display. In order to drive this dis-
play, synchronization is required to ensure that both control-
lers are outputting the same digit information at the same
time.
A more subtle advantage to slaving MM74C911s occurs
when trying to use multi-controllers to drive more digits. This
case, illustrated in Figure 22 allows fewer, more powerful
digit drivers to be used. This can be advantageous when us-
ing smaller displays that require little power to begin with.
VII. MM74C912/MM74C917 DISPLAY APPLICATIONS
Both the MM74C911/MM74C912 have predetermined char-
acter fonts and this limits their versatility, but greatly simpli-
fies their application in hex and decimal display application.
Still, there are a few small “tricks” that can be used to stretch
the controller’s capabilities.
In many applications, the decimal point segment is not
needed, particularly when the MM74C917 is used. Gener-
ally, this part is used to display hexadecimal address and
data information where decimal points are rarely needed.
These segments could be used for status information. Figure
23 shows a typical implementation. The status LEDs could
indicate power, run and halt status information of a host μP
or could indicate the type of instruction being executed. Al-
though the MM74C912 applications would tend to use the
decimal point more often, it is equally capable of implement-
ing Figure 23
Another possibility, if all six digits are not required, is to use
the unused digits for status indicators. A possible example
using the MM74C917 is shown in Figure 24 and another
possible implementation for the MM74C912 is shown in Fig-
ure 25 In both of these applications, four bits of data is
loaded into digits 1 and/or 2. Depending on the data loaded,
various combinations of discrete LEDs would be lit. The
AN006030-18
FIGURE 16. MM74C912/MM74C917 to Vacuum Fluorescent Display Interface
www.fairchildsemi.com
10
相關(guān)PDF資料
PDF描述
MM74C912 Simplified Multi-Digit LED Display Controller(多數(shù)字式LED顯示控制器)
MM74C917 Simplified Multi-Digit LED Display Controller(多數(shù)字式LED顯示控制器)
MM74C912N 6-Digit BCD Display Controller/Driver
MM74C914 Hex Schmitt Trigger with Extended Input Voltage
MM74C914M Hex Schmitt Trigger with Extended Input Voltage
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MM74C911N 功能描述:LED顯示驅(qū)動(dòng)器 4-Dgt Dis Controller 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
MM74C912 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6-Digit BCD Display Controller/Driver
MM74C912N 功能描述:LED顯示驅(qū)動(dòng)器 6-Dgt BCD Dis Con/Dr 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
MM74C914 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Hex Schmitt Trigger with Extended Input Voltage
MM74C914J 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Hex Schmitt Trigger with Extended Input Voltage
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