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参数资料
| 型号： | DLX713X |
| 厂商： | Osram Opto Semiconductors GmbH |
| 英文描述： | 5x7 Dot Matrix Intelligent Display |
| 中文描述： | 5x7点阵智能显示器 |
| 文件页数： | 3/4页 |
| 文件大小： | 183K |
| 代理商： | DLX713X |
www.in
fi
neon.com/opto
1-888-In
fi
neon (1-888-463-4636)
OSRAM Opto Semiconductors GmbH & Co. OHG
Regensburg, Germany
www.osram-os.com
+49-941-202-7178
2000 In
fi
neon Technologies Corp.
Optoelectronics Division
San Jose, CA
Appnote 25
3
May 31, 2000-13
Lamp Test
The lamp test when activated causes all dots on the display to
be illuminated at 1/7 brightness. It does not destroy any previ-
ously stored characters. The lamp test function is independent
of chip enable, write, and the settings of the blanking inputs.
This convenient test gives a visual indication that all dots are
functioning properly. Because lamp test does not affect the
display memory, it can be used as a cursor or pointer in a line
of displays.
General Design Considerations
When using the DLX713X on a separate display board having
more than six inches of cable length, it may be necessary to
buffer all of the input lines. A non-inverting 74LS244 buffer can
be used. The object is to prevent transient current into the
DLX713x protection diodes. The buffers should be located on
the display board and as close to the displays as possible.
Because of high switching currents caused by the multiplex-
ing, local power supply bypass capacitors are also needed in
many cases. These should be 10 volt, tantalum type having
10 uf capacitance. The capacitors may only be required every
2 displays depending on the line regulation and other noise
generators.
Decoupling capacitors should also be used across V
ground of each display. Typical value of these capacitors is
0.01 mF/10 V.
If small wire cables are used it is good engineering practice to
calculate the wire resistance of the ground and the +5 volt
wires. More than 0.2 volt drop (at 100 ma per digit) should be
avoided, since this loss is in addition to any inaccuracies or load
regulation of the power supply.
The 5 volt power supply for the DLX713X should be the same
one supplying the V
CC
to all logic devices. If a separate supply
must be used then local buffers should be used on all the
inputs and these buffers should be powered from the display
power supply. This precaution is to avoid line transients or any
logic signals to be higher than V
CC
and
CC
during power up.
Interfacing
For an eight digit display using the DLX713X, interfacing to a
single chip microprocessor is easy and straight forward.
Figure 5. Block diagram of the Intel 8031 controller
Conclusion
Note that although other manufacturers’ products are used in
the examples, this application note does not imply specific
endorsement, or warranty of other manufacturers’ products by
OSRAM. The interface schemes shown demonstrate the sim-
plicity of using the DLX713X dot matrix Intelligent Display. Slight
timing differences may be encountered for various microproces-
sors, but can be resolved similar to those encountered when
using different RAM’s. The techniques used in the examples
were shown for their generality. The user will undoubtedly invent
other schemes to optimize his particular system to its require-
ments.
8
8
3
8
8
LATCH
BUFFER
EPROM
27xx
DECODER
D
P3.0
P3.1
P3.2
P3.6
P
ALE
8031
7
A0-A7
7
7
OE
PSEN
x x x x x
B
B
L
W
C
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