 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA

SCD5580/1/2/3/4 A

www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)

OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany

www.osram-os.com • +49-941-202-7178

6

March 23, 2000-18

Display Column and Row Format

Column Data Ranges

Figure 7. SCD558X Block Diagram

C0

C1

C2

C3

C4

Row 0

11111

Row 1

00100

Row 2

00100

Row 3

00100

Row 4

00100

Row 0

00H to 1FH

Row 1

20H to 3FH

Row 2

40H to 5FH

Row 3

60H to 7FH

Row 4

80H to 9FH

0

1

2

3

4

5

6

7

ROW CONTROL LOGIC

& ROW DRIVERS

+5

Counter

+64

Counter

OSC.

USER RAM

MEMORY

X adress Deode

4 Bit Address Register

4 Bit Control Word Reg.

Control Word Logio

COL 0-19

ROW

0-4

(DIGIT 0-3)

MUX

Rate

I.C. #2

COL 0-19

(DIGITS 4-7)

ROW 0-4

(DIGITS 4-7)

RST

CLK i/O

CLKSEL

DATA

SDCLK

LOAD

I.C. #1

DISPLAY

Operation of the SCD558XA

The display consists of 2 CMOS ICs containing control logic

and drivers for eight 5 x 5 characters. These components are

assembled in a compact (38 mm x 10 mm) plastic package.

Individual LED dot addressablity allows the user great freedom

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.

The SCD558XA requires only 4 lines as compared to 15 for an

equivalent 8 character parallel input part.

The on-board CMOS ICs are the electronic heart of the display.

The IC accepts decoded serial data, which is stored in the inter-

nal RAM. Asynchronously the RAM is read by the character

multiplexer at a strobe rate that results in a flicker free display.

Figure 7 shows the three functional areas of the ICs. These

include: the input serial data register and control logic, a 200

bits two port RAM, and an internal multiplexer/display driver.

1=Display dot “On”

0=Display dot “Off’