SCD 5580 OSRAM Opto Semiconductors Inc, SCD 5580 Datasheet - Page 10

• Manufacturer Part Number: SCD 5580
• Manufacturer: OSRAM Opto Semiconductors Inc

Specifications of SCD 5580

• Display Type: Dot Matrix
• Emitting Color: Red
• Number Of Digits: 8
• Digit Size (in): .145in
• Viewing Area Height (mm): 3.68mm
• Viewing Area Length (mm): 2.54mm
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temp Range: -40C to 85C
• Mounting: Through Hole
• Pin Count: 24
• Total Thickness (mm): 5.08mm
• Opto Display Type: Panel
• Pattern Type: Dot Matrix
• Lead Free Status / RoHS Status: Compliant

Socket manufacturers are Aries Electronics, Inc., French-
town, NJ; Garry Manufacturing, New Brunswick, NJ; Robin-
son-Nugent, New Albany, IN; and Samtec Electronic
Hardward, New Albany, IN.
For further information refer to Appnote 22 in the current Sie-
mens Optoelectronic Data Book.
Optical Considerations
The 0.145" high character of the SCD558X gives readability
up to eight feet. Proper filter selection enhances readability
over this distance.
Using filters emphasizes the contrast ratio between a lit LED
and the character background. This will increase the dis-
crimination of different characters. The only limitation is cost.
Take into consideration the ambient lighting environment for
the best cost/benefit ratio for filters.
Incandescent (with almost no green) or fluorescent (with
almost no red) lights do not have the flat spectral response of
sunlight. Plastic band-pass filters are an inexpensive and
effective way to strengthen contrast ratios. The SCD5580/2
are red/high efficiency red displays and should be matched
with long wavelength pass filter in the 570 nm to 590 nm
range. The SCD5583/4 should be matched with a yellow-
green band-pass filter that peaks at 565 nm. For displays of
multiple colors, neutral density grey filters offer the best com-
promise.
Additional contrast enhancement is gained by shading the
displays. Plastic band-pass filters with built-in louvers offer
the next step up in contrast improvement. Plastic filters can
be improved further with anti-reflective coatings to reduce
glare. The trade-off is fuzzy characters. Mounting the filters
close to the display reduces this effect. Take care not to
overheat the plastic filter by allowing for proper air flow.
Figure 12. SCD Interface to Siemens/Intel 8031 Microprocessor (using serial port in mode 0)
V
CC
18
19
9 RST
XTAL2
XTAL1
8031
V
40
U1
CC
RXD
TXD
P3.7 17
P3.3 13
P3.4 14
10
11
28
SD
CLK
1 2
DATA
LOAD
27
23
6
V
V
CC
CC
MASTER
20 19 16 15 28
9
SCD
2–10
Optimal filter enhancements are gained by using circular
polarized, anti-reflective, band-pass filters. The circular polar-
izing further enhances contrast by reducing the light that
travels through the filter and reflects back off the display to
less than 1%.
Several filter manufacturers supply quality filter materials.
Some of them are: Panelgraphic Corporation, W. Caldwell,
NJ; SGL Homalite, Wilmington, DE; 3M Company, Visual
Products Division, St. Paul, MN; Polaroid Corporation, Polar-
izer Division, Cambridge, MA; Marks Polarized Corporation,
Deer Park, NY, Hoya Optics, Inc., Fremont, CA.
One last note on mounting filters: recessing displays and
bezel assemblies is an inexpensive way to provide a shading
effect in overhead lighting situations. Several Bezel manufac-
turers are: R.M.F. Products, Batavia, IL; Nobex Components,
Griffith Plastic Corp., Burlingame, CA; Photo Chemical Prod-
ucts of California, Santa Monica, CA; I.E.E.–Atlas, Van Nuys,
CA.
Microprocessor Interface
The microprocessor interface is through the serial port, SPI
port or one out of eight data bits on the eight bit parallel port
and also control lines SDCLK and LOAD.
Power Up Sequence
Upon power up display will come on at random. Thus the dis-
play should be reset at power-up. The reset will set the
Address Register to Digit 0, User RAM is set to 0 (display
blank) the Control Word is set to 0 (100% brightness with
Lamp Test off) and the internal counters are reset.
13 14
SD
CLK
1 2
DATA
27
LOAD
23
6
SLAVE
SCD
9
2019 16 15
13 14
SCD5580/5581/5582/5583/5584
22 F
TAN
+
.01
F