SCD 5580 OSRAM Opto Semiconductors Inc, SCD 5580 Datasheet - Page 6

• Manufacturer Part Number: SCD 5580
• Manufacturer: OSRAM Opto Semiconductors Inc

Specifications of SCD 5580

• Display Type: Dot Matrix
• Emitting Color: Red
• Number Of Digits: 8
• Digit Size (in): .145in
• Viewing Area Height (mm): 3.68mm
• Viewing Area Length (mm): 2.54mm
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temp Range: -40C to 85C
• Mounting: Through Hole
• Pin Count: 24
• Total Thickness (mm): 5.08mm
• Opto Display Type: Panel
• Pattern Type: Dot Matrix
• Lead Free Status / RoHS Status: Compliant

Operation of the SCD558X
The SCD558X display consists of a CMOS IC containing con-
trol logic and drivers for eight 5x5 characters. These compo-
nents are assembled in a compact (38 mm x 10 mm) plastic
package.
Individual LED dot addressablity allows the user great free-
dom in creating special characters or mini-icons. The User
Definable Character Set Examples illustrate 200 different
character and symbol possibilities.
The use of a serial data interface provides a highly efficient
interconnection between the display and the mother board.
Figure 8. SCD558X block diagram
Serial Data
Serial Data
Clock
Load
Mux CLK I/O
Mux Clock SEL
RESET
OPCODE
D7 D6 D5
OPCODE
Decode
Row Decoder
Counter Chain
& Timing Logic
— 3
Oscillator
& Driver
Software
Clear
— 5
D4 D3 D2 D1 D0
10
DATA
2–6
Character
Address
Register
Address
Register
Control
Word
The SCD558X requires only 4 lines as compared to 15 for an
equivalent 8 character parallel input part.
The on-board CMOS IC is the electronic heart of the display.
The IC accepts decoded serial data, which is stored in the
internal RAM . Asynchronously the RAM is read by the char-
acter multiplexer at a strobe rate that results in a flicker free
display. Figure 8 shows the three functional areas of the IC.
These include: the input serial data register and control
logic, a 200 bits two port RAM, and an internal multiplexer/
display driver.
0
1
Power Down
Brightness &
5
4
Lamp Test
8 - 5X5 Characters
2
5
3
Character/
Address
Decode
WRITE
Row
4
5
Column Logic & Driver
READ 10 X 20
WRITE 40 X 5
200 Bits
Multiplexer
— 20
6
Display
RAM
SCD5580/5581/5582/5583/5584
7
Column
Output