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DLX2416 Datasheet(PDF) 4 Page - OSRAM GmbH

No. de pieza DLX2416
Descripción Electrónicos  Intelligent Display Device
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Fabricante Electrónico  OSRAM [OSRAM GmbH]
Página de inicio  http://www.osram.com
Logo OSRAM - OSRAM GmbH

DLX2416 Datasheet(HTML) 4 Page - OSRAM GmbH

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 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA
Appnote 14
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany
www.osram-os.com • +49-941-202-7178
4
May 31, 2000-12
When using the DLX2416 on a separate display board having
more than 6 inches of cable length, it may be necessary to
buffer all inputs. This is most easily achieved with Hex non-
inverting buffers such as the 74365. The object is to prevent
transient current in the protection diodes. The buffers should
be located on the display board near the displays.
Local power supply bypass capacitors are also needed in many
cases. These should be 6 or 10 volt, tantalum type having 10 µF
or greater capacitance. Low internal resistance is important due
to current steps which result from the internal multiplexing of
the displays.
If small wire cables are used, it is good engineering practice to
calculate the wire resistance of the ground plus the +5 volt
wires. More than 0.1 volt drop, (at 25 mA per digit worst case)
should be avoided, since this loss is in addition to any inaccura-
cies or load regulation limitations of the power supply.
Figure 6. General interface circuit
Figure 7. 16-digit parallel I/O system
Display
Decoder
Display
Display
Display
Vcc
GND
D0–D6
A2
A3
CE
7/
CU
CUE
BL
CLR
WR
A0
A1
D15
D12 D11
D8 D7
D4 D3
D0
0-6
7
Display
Port A
D0
Display
Display
Display
D3
D4
D7
D8
D11
D12
D15
Port B
Port C
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Control
Data
8080
µP
System
8255
Vcc
GND
D0–D6
CU
CLR
CUE
BL
A0
A1
A2
A3
3
2
1
0
WR
A
B
C
D
7442
5
/
The 5-volt power supply for the displays should be the
same one supplying VCC to all logic devices which drive the dis-
play devices. If a separate supply must be used, then local buff-
ers using hex non-inverting gates should be used on all displays
inputs and these buffers should be powered from the display
power supply. This precaution is to avoid logic inputs higher
than display VCC during power up or line transients.
Program for 16-Character Message
INT:
MVI A,80H
OUT CONTROL
;CONTROL DATA MODE
;LOAD CONTROL REGISTER
CUSR:
MVI A,00H
OUT PORT A
MVI B, 0FH
;CLEAR CURSOR DATA
;LOAD DATA PORT
;SET CHARACTER COUNTER
CUSRI:
MOV A, B
CALL DSPWT
DCR B
JNZ CUSRI
MOV A, B
CALL DSPWT
MVI A, FFH
OUT PORT B
;
;WRITE SUBROUTINE
;DECREMENT COUNTER
;DIGIT 0?
;
;
;SET DATA FOR CONTROL
;LOAD CONTROL LINES
DISP:
LXI H, TABLE
;SET TABLE ADDRESS
DISP1:
MOV A, M
OUT PORT A
MOV A, B
CALL DSPWT
INX H
INR B
MVI A, 10H
CMP B
JNZ DISP1
HALT
;MOVE TABLE DATA INTO
ACCUMULATOR
;LOAD DATA PORT
;
;LOAD ADDRESS AND
CONTROL
;INCREMENT TABLE
ADDRESS
;INCREMENT COUNTER
;SET # OF DIGITS
;
;16 CHARACTERS?
;END OF PROGRAM
DSPWT:
ORI F0H
OUT PORT C
ANI 7FH
OUT PORT C
ORI F0H
OUT PORT C
RET
;SET CONTROL BITS OFF
;LOAD CONTROL
;SET WRITE BIT ON
;LOAD WRITE
;SET WRITE BIT OFF
;LOAD CONTROL
TABLE:
DB
;0C3H
;0C9H
;0D4H
;0D3H
;0C1H
;0D4H
;0CEH
;0C1H
;0C6H
;0A0H
;0D3H
;0D4H
;0C8H
;0C7H
;0C9H
;0CCH


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