SCD55100A, SCD55101A, SCD55102A, SCD55103A, SCD55104A

2006-02-20

7

Operation of the SCD5510XA

The SCD5510XA display consists of a CMOS IC 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 sym-

bol possibilities.

The use of a serial data interface provides a highly efficient inter-

connection between the display and the mother board. The

SCD5510XA requires only 4 lines as compared to 15 for an equiv-

alent 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 character multiplexer at a

strobe rate that results in a flicker free display. Figure „Row and

Column Location“ (page 9) shows the three functional areas of the

IC. These include: the input serial data register and control logic, a

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

SCD5510XA Block Diagram

Display Column and Row Format

C0

C1

C2

C3

C4

Row 0

1

1

1

1

1

Row 1

0

0

1

0

0

Row 2

0

0

1

0

0

Row 3

0

0

1

0

0

Row 4

0

0

1

0

0

Column Data Ranges

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

LOAD

Write 50 x 5

Read 10 x 25

RAM

250 bits

Display Multiplexer

5

5

Adddress

Character

Register

Adddress

Register

Word

Control

4

Software

Clear

OPCODE

Decode

3

D7 D6 D5

OPCODE

DATA

D4 D3 D2 D1 D0

5

&

Power Down

Brightness &

Lamp Test

Data Clock

Serial

Data

Oscillator

Counter Chain

& Timing Logic

Column Logic & Driver

1

0

23

4

5

8

9

10 - 5 x 5 Characters

67

20

& Driver

Row Decoder

10

MUX CLK I/O

MUX Clock SEL

RESET

IDBD5069

Serial