Datasheet

SCD55100A, SCD55101A, SCD55102A, SCD55103A, SCD55104A
2008-07-22 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
Row Address Decode
Write Character/
Write 50 x 5
Read 10 x 25
Column Output
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
10 2345 89
10 - 5 x 5 Characters
67
20
& Driver
Row Decoder
10
MUX CLK I/O
MUX Clock SEL
RESET
IDBD5069
Serial