SCF5740 OSRAM Opto Semiconductors Inc, SCF5740 Datasheet - Page 11

• Manufacturer Part Number: SCF5740
• Description: DISPLAY 4CHAR .270" 5X7 RED
• Manufacturer: OSRAM Opto Semiconductors Inc
• Series: Intelligent Display®r

Specifications of SCF5740

• Millicandela Rating: 55µcd
• Size / Dimension: 1.30" L x 0.79" W x 0.28" H (33.02mm x 20.07mm x 7mm)
• Color: Red
• Configuration: 5 x 7
• Number Of Digits: 4
• Character Size: 0.27 in
• Illumination Color: Red
• Wavelength: 650 nm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 55 ucd
• Viewing Area (w X H): 4.45 mm x 6.86 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: Details
• Other names: Q68000A8848

Post Solder Cleaning Procedures
The least offensive cleaning solution is hot D.I. water (60 °C) for
less than 15 minutes. Addition of mild saponifiers is acceptable. Do
not use commercial dishwasher detergents.
For faster cleaning, solvents may be used. Exercise care in choos-
ing solvents as some may chemically attack the nylon package. For
further information refer to Appnotes 18 and 19 at
www.osram-os.com
An alternative to soldering and cleaning the display modules is to
use sockets. Naturally, 14 pin DIP sockets 7.62 mm (0.300") wide
with 2.54 mm (0.100") centers work well for single displays. Multi-
ple display assemblies are best handled by longer SIP sockets or
DIP sockets when available for uniform package alignment. Socket
manufacturers are Aries Electronics, Inc., Frenchtown, NJ; Garry
Manufacturing, New Brunswick, NJ; Robinson-Nugent, New
Albany, IN; and Samtec Electronic Hardward, New Albany, IN.
For further information refer to Appnote 22 at www.osram-os.com
Optical Considerations
The 6.86 mm (0.270") high character of the SCF574X 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 SCF5740 is a red display and
should be used with long wavelength pass filter having a sharp
cut-off in the 600 nm to 620 nm range. The SCF5742 is a
super-red display and should be used with long wavelength pass
filter having a sharp cut-off in the 570 nm to 600 nm range. The
SCF5744 is a high efficiency green display and should be used
with long wavelength pass filter that peaks at 565 nm.
Display Interface to Siemens/Intel 8031 Microprocessor (using serial port in mode 0)
2006-01-23
V
CC
18
19
9
XTAL2
XTAL1
RST
8031
V
U1
CC
40
P3.7
P3.3
P3.4
RxD
TxD
10
11
17
13
14
11
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
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.
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 con-
trol lines SDCLK and LOAD.
Power Up Sequence
Upon power up display will come on at random. Thus the display
should be reset at power-up. The reset will set the Address Regis-
ter 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.
15
13
19
2
SDCLK
LD
RST
GND
SCF5740, SCF5742, SCF5744
ID
CLKSEL
CLK I/O
DATA
GND
V
CC
14
10
21
8
V
CC
0.01 µF
22 µF
IDCD5224
TAN