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| 型号： | SCE5741Q |
| 元件分类： | 显示用LED |
| 英文描述： | 5X7 DOT MATRIX DISPLAY, YELLOW, 4.57 mm |
| 封装： | PLASTIC, SIP-7 |
| 文件页数： | 3/15页 |
| 文件大小： | 589K |
| 代理商： | SCE5741Q |
2000 Inneon Technologies Corp. Optoelectronics Division San Jose, CA
SCE5740/1/2/3/4/5
www.inneon.com/opto 1-888-Inneon (1-888-463-4636)
OSRAM Opto Semiconductors GmbH & Co. OHG Regensburg, Germany
www.osram-os.com +49-941-202-7178
11
March 28, 2000-10
Electrical and Mechanical Considerations
Thermal Considerations
Optimum product performance can be had when the following
electrical and mechanical recommendations are adopted. The
IC is constructed in a high speed CMOS process, consequently
noise on the SERIAL DATA, SERIAL DATA CLOCK, LOAD and
RESET lines may cause incorrect data to be written into the
serial shift register. Adhere to transmission line termination
procedures when using fast line drivers and long cables
(>10 cm).
Good ground and power supply decoupling will insure that ICC
(<400 mA peak) switching currents do not generate localized
ground bounce. Therefore it is recommended that each display
package use a 0.1
F and 0 F capacitor between V
CC and
ground.
When the internal MUX Clock is being used connect the
CLKSEL pin to VCC. In those applications where RESET will not
be connected to the system’s reset control, it is recommended
that this pin be connected to the center node of a series 0.1,
F
and 100 k
RC network. Thus upon initial power up the RESET
will be held low for 10 ms allowing adequate time for the sys-
tem power supply to stabilize.
ESD Protection
The input protection structure of the SCE574x provides signi-
cant protection against ESD damage. It is capable of withstand-
ing discharges greater than 2.0 kV. Take all the standard
precautions, normal for CMOS components. These include
properly grounding personnel, tools, tables, and transport carri-
ers that come in contact with unshielded parts. If these condi-
tions are not, or cannot be met, keep the leads of the device
shorted together or the parts in anti-static packaging.
Soldering Considerations
The SCE574x 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 ux (except carboxylic acid) or rosin-based RMA
ux 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 tempera-
tures above 260
°C for ve seconds at 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 saponiers is accept-
able. Do not use commercial dishwasher detergents.
For faster cleaning, solvents may be used. Exercise care in
choosing solvents as some may chemically attack the nylon
package. For further information refer to Appnotes 18 and 19.
An alternative to soldering and cleaning the display modules is
to use sockets. Naturally, 14 pin DIP sockets .300” wide with
.100" centers work well for single displays. Multiple display
assemblies are best handled by longer SIP sockets or DIP sock-
ets when available for uniform package alignment.
Optical Considerations
The 0.180" high character of the SCE574x gives readability up
to ve feet. Proper lter selection enhances readability over
this distance.
Using lters emphasizes the contrast ratio between a lit LED
and the character background. This will increase the discrimina-
tion of different characters. The only limitation is cost. Take into
consideration the ambient lighting environment for the best
cost/benet ratio for lters.
Incandescent (with almost no green) or uorescent (with
almost no red) lights do not have the at spectral response of
sunlight. Plastic band-pass lters are an inexpensive and effec-
tive way to strengthen contrast ratios. The SCE5740 is a red
display and should be used with long wavelength pass lter
having a sharp cut-off in the 600 nm to 620 nm range. The
SCE5742 is a high efciency red display and should be used
with long wavelength pass lter having a sharp cut-off in the
570 nm to 600 nm range. The SCE5744 is a high efciency
green display and should be used with long wavelength pass
lter that peaks at 565 nm.
Additional contrast enhancement is gained by shading the
displays. Plastic band-pass lters with built-in louvers offer the
next step up in contrast improvement. Plastic lters can be
improved further with anti-reective coatings to reduce glare.
Optimal lter enhancements are gained by using circular polar-
ized, anti-reective, band-pass lters. The circular polarizing fur-
ther enhances contrast by reducing the light that travels
through the lter and reects back off the display to less
than 1%.
Several lter manufacturers supply quality lter materials.
Some of them are: Panelgraphic Corporation, W. Caldwell, NJ;
SGL Homalite, 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 l-
ters: 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, Grifth Plastic Corp., Burlingame, CA;
Photo Chemical Products of California, Santa Monica, CA;
I.E.E.-Atlas, Van Nuys, CA. The trade-off is fuzzy characters.
Mounting the lters close to the display reduces this effect.
Take care not to overheat the plastic lter by allowing for
proper air ow.
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) and the
internal counters are reset.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SCE5742 | 功能描述:LED 显示器和配件 5x7 Super Red 0.18", 4-CHARACTER RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| SCE5742P | 功能描述:LED 显示器和配件 5x7 Super Red 0.18", 4-CHARACTER RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| SCE5742Q | 功能描述:LED 显示器和配件 5x7 Super Red 0.18", 4-CHARACTER RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| SCE5743 | 功能描述:LED 显示器和配件 5x7 Green 0.18", 4-CHARACTER RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| SCE5743P | 功能描述:LED 显示器和配件 5x7 Green 0.18", 4-CHARACTER RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
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