SCDV5540 OSRAM Opto Semiconductors Inc, SCDV5540 Datasheet - Page 11

• Manufacturer Part Number: SCDV5540
• Description: LED DISPLAY 7 SEG RED
• Manufacturer: OSRAM Opto Semiconductors Inc

Specifications of SCDV5540

• Millicandela Rating: 1.8mcd
• Size / Dimension: 0.78" L x 0.40" W x 0.20" H (19.91mm x 10.16mm x 5.08mm)
• Color: Red
• Configuration: 5 x 5
• Number Of Digits: 4
• Character Size: 0.123 in
• Illumination Color: Red
• Wavelength: 665 nm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 1.8 mcd
• Viewing Area (w X H): 2.41 mm x 3.41 mm
• Display Type: 5 x 7 Dot Matrix
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Forward (vf) Typ: -
• Internal Connection: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q2764828; Q68000A8890

Optical Considerations
The 3.2 mm (0.123") high character of the SCDV554X gives read-
ability up to five 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 discrimination of
different characters. The only limitation is cost. Take into consider-
ation 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. Plas-
tic band-pass filters are an inexpensive and effective way to
strengthen contrast ratios. The SCDV5540/2 are red/super-red dis-
plays and should be matched with long wavelength pass filter in
the 570 nm to 590 nm range. The SCDV5543/4 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 compromise.
Additional contrast enhancement is gained by shading the dis-
plays. Plastic band-pass filters with built-in louvers offer the next
step up in contrast improvement. Plastic filters can be improved
SCDV Interface with Siemens/Intel 8031 Microprocessor (using serial port in mode 0)
SCDV Interface with Siemens/Intel 8031 Microprocessor (using one bit of parallel port as serial input)
2006-01-23
V
CC
V
CC
SCDV5540, SCDV5541, SCDV5542, SCDV5543, SCDV5544
18
19
18
19
20
9
1
9
XTAL2
XTAL1
RST
XTAL2
XTAL1
RST
P1.0
8031
U1
8031
V
V
U1
CC
CC
40
40
P3.7
P3.3
P3.4
P3.0
P3.1
P3.6
P0.0
RxD
TxD
10
11
17
13
14
10
11
16
39
11
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.
Optimal filter enhancements are gained by using circular polarized,
anti-reflective, band-pass filters. The circular polarizing further
enhances contrast by reducing the light that travels through the fil-
ter 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 Homa-
lite, Wilmington, DE; 3M Company, Visual Products Division, St.
Paul, MN; Polaroid Corporation, Polarizer 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 manufacturers are:
R.M.F. Products, Batavia, IL; Nobex Components, Griffith Plastic
Corp., Burlingame, CA; Photo Chemical Products of California,
Santa Monica, CA; I.E.E.–Atlas, Van Nuys, CA.
1
2
6
7
1
2
6
7
SDCLK
LD
RST
GND
SDCLK
LD
RST
GND
ID
ID
CLK I/O
CLK I/O
DATA
DATA
GND
GND
V
V
V
V
V
V
CS
CS
CC
CC
CC
CC
CC
CC
14
13
12
11
10
9
8
14
13
12
11
10
9
8
V
V
CC
CC
0.01 µF
0.01 µF
22 µF
22 µF
IDCD5230
TAN
TAN
IDCD5231