SCE5783 OSRAM Opto Semiconductors Inc, SCE5783 Datasheet - Page 10

• Manufacturer Part Number: SCE5783
• Description: INTELLIGENT DISP 8CHAR 5X7 GRN
• Manufacturer: OSRAM Opto Semiconductors Inc
• Series: Intelligent Display®r

Specifications of SCE5783

• Millicandela Rating: 150µcd
• Size / Dimension: 1.69" L x 0.45" W x 0.21" H (42.93mm x 11.43mm x 5.33mm)
• Color: Green
• Configuration: 5 x 7
• Number Of Digits: 8
• Character Size: 0.18 in
• Illumination Color: Green
• Wavelength: 565 nm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 150 ucd
• Viewing Area (w X H): 2.54 mm x 4.57 mm
• Display Type: 5 x 7 Dot Matrix
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Forward (vf) Typ: -
• Internal Connection: -
• Lead Free Status / Rohs Status: Details
• Other names: 475-2578; Q68000A9103; SCE5783

Row Strobing
The SCE578X allows a high frequency external oscillator source
to drive the display. Data bit, D4, in the control word format con-
trols the prescaler function. The prescaler allows the oscillator
source to be divided by 16 by setting D4=1. However, the pres-
caler should not be used, i.e., when using the internal oscillator
source.
The Software Clear (C0
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.
Software Clear
Op code
D7 D6
1
Multiplexer and Display Driver
The eight characters are row multiplexed with RAM resident col-
umn 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. Bring-
ing 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 lower-
ing the brightness level, reducing the total number of LEDs illumi-
nated, or lowering V
supply, has little effect on the power dissipation of the display and
is not considered when determining the power dissipation.
2006-01-23
1
Control Word
D5 D4
0
Row
Load
0
LED
0
1
2
3
4
5
6
0
D3 D2
Load Row 0
. The V
0
HEX
Columns
1 2 3 4
0
), given in Table „Software Clear“,
CC
D1
0
supply, relative to the V
0
1
2
3
4
5
6
0
D0
Load Row 1
0 1 2 3 4
Columns
Hex
C0
0
1
2
3
4
5
6
Load Row 2
0 1 2 3 4
Columns
Operation
CLEAR
LED
0
1
2
3
4
5
6
Load Row 3
0 1 2 3 4
10
Columns
To determine the power deration with a given ambient tempera-
ture, use the following formula:
where:
To determine the power dissipation of the display, use the following
formula:
where:
A typical thermal resistance value (θ
when mounted in a socket soldered on a 1.57 mm (0.062") thick
PCB with 0.5 mm (0.020"), 1 ounce copper traces and the display
covered by a plastic filter. The display’s maximum IC junction tem-
perature is 125°C. Power Deration Curve is based on these typical
values.
Power Deration Curve (θ
V
ground. V
the power for the LEDs. By separating the two supplies, V
V
T
PD
CC
LL
jmax
can be varied independently and keeps the logic supply clean.
and V
=
0
1
2
3
4
5
6
P
CC
Load Row 4
=
N I
LL
0
Columns
are two separate power supplies sharing a common
supplies power for all the display logic. V
1 2 3 4
T
P
θ
⋅
N=number of LEDs on
I
RB=relative brightness level
2.5
2.0
1.5
1.0
0.5
T
LL
W
ja
jmax
D
0
=thermal resistance, junction to ambient
/140=average current for a single LED
A
-40
=power dissipated by the ICs
LL
=maximum IC junction temperature
+
⁄
-20
P
140 RB
0
1
2
3
4
5
6
D
Load Row 5
0 1
Columns
⋅
0
θ
⋅
2 3 4
ja
ja
=50°C/W)
20
ja
0
1
2
3
4
5
6
) for this display is 50 °C/W
40
Load Row 6
0 1 2 3 4
Columns
IDXX5192
60
IDDG5333
T
SCE5780
˚C 100
LL
supplies
CC
and