PDSP2110 Datasheet, PDF (13/14 Pages) OSRAM GmbH – Lead (Pb) Free Product - RoHS Compliant

PDSP2110, PDSP2111, PDSP2112, PDSP2113, PDSP2114
Electrical and Mechanical Considerations
Voltage Transient Suppression
For best results power the display and the components that inter-
face with the display to avoid logic inputs higher than V_CC. Addi-
tionally, the LEDs may cause transients in the power supply line
while they change display states. The common practice is to place
a parallel combination of a 0.01 µF and a 22 µF capacitor between
V_CC and GND for all display packages.
ESD Protection
The input protection structure of the PDSP2110/1/2/3/4 provides
significant protection against ESD damage. It is capable of with-
standing discharges greater than 2.0 kV. Take all the standard pre-
cautions, normal for CMOS components. These include properly
grounding personnel, tools, tables, and transport carriers that come
in contact with unshielded parts. If these conditions are not, or can-
not be met, keep the leads of the device shorted together or the
parts in anti-static packaging.
Soldering Considerations
The PDSP2110/1/2/3/4 can be hand soldered with SN63 solder
using a grounded iron set to 260°C.
Wave soldering is also possible following these conditions: Pre-
heat that does not exceed 93°C on the solder side of the PC board
or a package surface temperature of 85°C. Water soluble organic
acid flux (except carboxylic acid) or rosin-based RMA flux without
alcohol can be used.
Wave temperature of 245°C ± 5°C with a dwell between 1.5 sec. to
3.0 sec. Exposure to the wave should not exceed temperatures
above 260°C for five seconds at 1.59 mm (0.063") below the seating
plane. The packages should not be immersed in the wave.
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.
Maximum exposure should not exceed two minutes at elevated
temperatures. Acceptable solvents are TF (trichorotrifluorethane),
TA, 111 Trichloroethane, and unheated acetone.⁽¹⁾
Note:
1) _{Acceptable commercial solvents are: Basic TF, Arklone, P.}
Genesolv, D. Genesolv DA, Blaco-Tron TF and Blaco-Tron TA.
Unacceptable solvents contain alcohol, methanol, methylene
chloride, ethanol, TP35, TCM, TMC, TMS+, TE, or TES. Since
many commercial mixtures exist, contact a solvent vendor for
chemical composition information. Some major solvent manufac-
turers are: Allied Chemical Corporation, Specialty Chemical Divi-
sion, Morristown, NJ; Baron-Blakeslee, Chicago, IL; Dow
Chemical, Midland, MI; E.I. DuPont de Nemours & Co., Wilming-
ton, DE.
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, 28 pin DIP sockets 15.24 mm (0.600") wide
with 2.54 mm (0.100") centers work well for single displays.
Multiple display assemblies are best handled by longer SIP sock-
ets 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 5.10 mm (0.200") high character of the PDSP211X gives read-
ability 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 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 PDSP2110/2112 are red/super-red
displays and should be matched with long wavelength pass filter in
the 570 nm to 590 nm range. The PDSP2111/2113/2114 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
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 polar-
ized, anti-reflective, band-pass filters. The circular polarizing fur-
ther 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 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.
2006-01-23
13