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参数资料
| 型号： | CS4207-DNZR |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | 消费家电 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封装： | 6 X 6 MM, LEAD FREE, MO-229, QFN-48 |
| 文件页数： | 3/15页 |
| 文件大小： | 814K |
| 代理商： | CS4207-DNZR |
SCE5780
2006-01-23
11
V
LL can be varied between 3.0 V and 5.5 V. The LED drive cur-
rent will vary with changes in V
LL. See Figure ILL variance“:
I
LL Variance
V
CC can vary between 4.5 V and 5.5 V. Operation below 4.5 V will
change the timing and switching levels of the inputs.
Interconnect Considerations
Optimum product performance can be had when the following
electrical and mechanical recommendations are adopted. The
SCE578X’s IC is constructed in a high speed CMOS process; con-
sequently high speed 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 ter-
mination procedures when using fast line drivers and long cables
(> 10 cm).
Good ground and power supply decoupling will insure that
I
CC (< 800 mA peak) switching currents do not generate localized
ground bounce. Therefore it is recommended that each display
package use a 0.1 F and 20 F tantulum capacitor between V
CC
and ground.
When the internal MUX Clock is being used connect the CLKSEL
pin to V
CC. In those applications where RESET will not be con-
nected 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 system power supply
to stabilize.
ESD Protection
The input protection structure of the SCE578X provides significant
protection against ESD damage. It is capable of withstanding dis-
charges greater than 2.0 kV. Take all the standard precautions,
normal for CMOS components. These include properly grounding
personnel, tools, tables, and transport carriers that come in con-
tact with unshielded parts. If these conditions are not, or cannot be
met, keep the leads of the device shorted together or the parts in
antistatic packaging.
Soldering Considerations
The SCE578X 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 resin-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 tempera-
tures 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.
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 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.
Optical Considerations
The 4.57 mm (0.180") high character of the SCE578X 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 SCE5780 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 SCE5782 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
SCE5784 is a high efficiency green display and should be used
with long wavelength pass filter that peaks at 565 nm. The
SCE5785 is a soft orange display and should be used with long
wavelength pass filter that peaks at 610 nm. The SCE5786 is an
InGaAlP red display and should be used with long wavelength
pass filter that peaks at 645 nm.
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-
IDDG5334
3
0
LL
V
LL
I
3.5
4
4.5
5
V 5.5
0.2
0.4
0.6
0.8
1.0
1.2
1.4
A
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