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參數(shù)資料
| 型號： | SCF5744 |
| 廠商： | SIEMENS A G |
| 元件分類： | 顯示用LED |
| 英文描述： | 0.270” 4-Character, 5x7 Dot Matrix Serial Input Dot Addressable Intelligent Display |
| 中文描述： | 5X7 DOT MATRIX DISPLAY, HIGH EFFICIENCY GREEN, 6.86 mm |
| 封裝： | PLASTIC, DIP-22 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 93K |
| 代理商： | SCF5744 |
2–208
SCF5740/2/4
The SCF574X allows a high frequency external oscillator
source to drive the display. Data bit, D4, in the control word
format controls the prescaler function. The prescaler allows
the oscillator source to be divided by 16 by setting D4=1.
However, the prescaler should not be used, i.e., when using
the internal oscillator source.
The Software Clear (C0
HEX
), given in Table 6, clears the
Address Register and the RAM. The display is blanked and
the Character Address Register will be set to Character 0.
The internal counter and the Control Word Register are unaf-
fected. The Software Clear will remain active until the next
data input cycle is initiated.
Table 6. Software Clear
Multiplexer and Display Driver
The four characters are row multiplexed with RAM resident
column data. The strobe rate is established by the internal or
external MUX Clock rate. The MUX Clock frequency is
divided by a 448 counter chain. This results in a typical
strobe rate of 768 Hz. By pulling the Clock SEL line low, the
display can be operated from an external MUX Clock. The
external clock is attached to the CLK I/O connection (pin 9).
The maximum external MUX Clock frequency should be lim-
ited to 1 MHz.
An asynchronous hardware Reset (pin 8) is also provided.
Bringing this pin low will clear the Character Address Regis-
ter, Control Word Register, RAM, and blanks the display. This
action leaves the display set at Character Address 0, and the
Brightness Level set at 100%.
ELECTRICAL & MECHANICAL CONSIDERATIONS
Interconnect Considerations
Optimum product performance can be had when the follow-
ing electrical and mechanical recommendations are
adopted. The SCF574X’s IC is constructed in a high speed
CMOS process, consequently 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 reg-
ister. Adhere to transmission line termination procedures
when using fast line drivers and long cables (>10 cm).
Op code
D7 D6
Control Word
D5 D4 D3 D2 D1 D0
Hex
Operation
1 1
0 0 0 0 0 0
C0
CLEAR
Good ground (pin 2) and power supply decoupling (pins 9
and 10) will insure that Icc (<400 mA peak) switching cur-
rents do not generate localized ground bounce. Therefore it
is recommended that each display package use a 0.1
μ
F and
20
μ
F capacitor between V
CC
and ground.
When the internal MUX Clock is being used connect the CLK-
SEL pin to V
CC
. 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,
μ
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 SCF574X provides signif-
icant protection against ESD damage. It is capable of with-
standing discharges greater than 2 KV. Take all the standard
precautions, 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 cannot be met, keep the leads of the
device shorted together or the parts in anti-static packaging.
Soldering Considerations
The SCF574X can be hand soldered with SN63 solder using
a grounded iron set to 260
°
C.
Wave soldering is also possible following these conditions:
Preheat 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 tem-
peratures above 260
°
C for five seconds at 0.063" below the
seating plane. The packages should not be immersed in the
wave.
Figure 9. Row Strobing
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
ROW LOAD LOAD ROW 0 LOAD ROW 1 LOAD ROW 2 LOAD ROW 3 LOAD ROW 4 LOAD ROW 5 LOAD ROW 6
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
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