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參數資料
| 型號： | SCE5784 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 顯示用LED |
| 英文描述： | 5X7 DOT MATRIX DISPLAY, HIGH EFFICIENCY GREEN, 4.57 mm |
| 封裝： | PLASTIC, DIP-26 |
| 文件頁數： | 2/14頁 |
| 文件大小： | 208K |
| 代理商： | SCE5784 |
2001 OSRAM Opto Semiconductors Inc. San Jose, CA
SCE5780/1/2/3/4/5/6
www.inneon.com/opto 408-456-4000
OSRAM Opto Semiconductors GmbH & Co. OHG Regensburg, Germany
www.osram-os.com +49-941-202-7178
10
August 1, 2001-18
Figure 10. Row Strobing
The SCE578X 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 (C0HEX), given in Table 7, 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 unaffected.
The Software Clear will remain active until the next data input
cycle is initiated.
Table 7. Software Clear
Multiplexer and Display Driver
The eight 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 320 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.
An asynchronous hardware Reset (pin 24) is also provided.
Bringing this pin low will clear the Character Address Register,
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%, prescaler ÷1.
Electrical and Mechanical Considerations
Thermal Considerations
The display’s power usage may need to be reduced to operate
at high ambient temperatures. The power may be reduced by
lowering the brightness level, reducing the total number of
LEDs illuminated, or lowering VLED. The VCC supply, relative to
the VLED supply, has little effect on the power dissipation of
the display and is not considered when determining the
power dissipation.
To determine the power deration with a given ambient temper-
ature, use the following formula:
where: Tjmax=maximum IC junction temperature
PD=power dissipated by the ICs
θ
ja=thermal resistance, junction to ambient
To determine the power dissipation of the display, use the fol-
lowing formula:
where: N=number of LEDs on
ILL/140=average current for a single LED
RB=relative brightness level
A typical thermal resistance value (qja) for this display is
50
°C/W when mounted in a socket soldered on a 0.062" thick
PCB with 0.020", 1 ounce copper traces and the display cov-
ered by a plastic lter. The display’s maximum IC junction tem-
perature is 125
°C. Power Deration Curve is based on these
typical values.
Figure 11. Power Deration Curve (
θ
ja=50°C/W)
VCC and VLL are two separate power supplies sharing a com-
mon ground. VCC supplies power for all the display logic. VLL
supplies the power for the LEDs. By separating the two sup-
plies, VCC and VLL can be varied independently and keeps the
logic supply clean.
VLL can be varied between 3.0 volts and 5.5 volts. The LED
drive current will vary with changes in VLL. See Figure 12 for
ILL variance.
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
Op code
D7 D6
Control Word
D5 D4 D3 D2 D1 D0
Hex
Operation
1
0
0000
C0
CLEAR
T
jmax
T
A
P
D
θ
ja
+
=
PD
N I
LL 140
RB
=
Temperature
Watts
0.0
0.5
1.0
1.5
2.0
2.5
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100
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