SCD 5580 OSRAM Opto Semiconductors Inc, SCD 5580 Datasheet - Page 7

• 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

The following explains how to format the serial data to be
loaded into the display. The user supplies a string of bit
mapped decoded characters. The contents of this string is
shown in Figure 9a. Figure 9b shows that each character
consist of six 8 bit words. The first word encodes the display
character location and the succeeding five bytes are row
data. The row data represents the status (On, Off) of individ-
ual column LEDs. Figure 9c shows that each that each 8 bit
word is formatted to include a three bit Operational Code
(OPCODE) defined by bits D7–D5 and five bits (D4–D0) rep-
resenting Column Data, Character Address, or Control Word
Data.
Figure 9d shows the sequence for loading the bytes of data.
Bringing the LOAD line low enables the serial register to
accept data. The shift action occurs on the low to high transi-
tion of the serial data clock (SDCLK). The least significant bit
(D0) is loaded first. After eight clock pulses the LOAD line is
brought high. With this transition the OPCODE is decoded.
The decoded OPCODE directs D4-D0 to be latched in the
Character Address register, stored in the RAM as Column
data, or latched in the Control Word register. The control IC
requires a minimum 600 ns delay between successive byte
loads. As indicated in Figure 9a, a total of 528 bits of data
are required to load all eight characters into the display.
Figure 9a–d. Loading serial character data
a.
b.
c.
d.
Character 0
Character 0
D0
Address
Character Address
0
LOAD
Serial
Clock
DATA
D1
0
Character 1
11 Clock Cycles, 2.2 µs
D2
0
D3
0
Row 0 Column
Example: Serial Clock = 5 MHz, Clock Period = 200 ns
t
0
Clock
Period
66 Clock Cycles, 13.2 µs
D4
D0
Data
0
Character 2
D5
1
OPCODE
D1
D6
0
528 Clock Cycles, 105.6 µs
D7
Row 1 Column
0
D2
600 ns(min.)
Character 3
Data
Between
Loads
Time
D3
D4
2–7
Row Address Register bits, D7–D5 (Table 3), direct the Col-
umn Data bits, D4–D0 (Table 3) to specific RAM location.
Table 1 shows the Row Address for the example character
“D.” Column data is written and read asynchronously from the
200 bit RAM. Once loaded the internal oscillator and charac-
ter multiplexer reads the data from the RAM. These charac-
ters are row strobed with column data as shown in Figures 8
and 9. The character strobe rate is determined by the internal
or user supplied external MUX Clock and the IC’s 320
counter.
Table 1. Character “D”
D0
C4
Row 2 Column
Character 4
Row 0
Row 1
Row 2
Row 3
Row 4
Column Data
11 Clock Cycles, 2.2 µs
D5
Data
D1
C3
D2
C2
D6
D7
0
0
0
0
1
D3
C1
Character 5
Opcode
Row 3 Column
D7
D6
0
0
1
1
0
D4
C0
Data
D5 D6 D7
Time between LOADS
D5
0
1
0
1
0
OPCODE
Character 6
1
1
1
1
1
D4
Row 4 Column
D3
1
0
0
0
1
Column Data
600 ns(min.)
Between
Loads
Data
SCD5580/5581/5582/5583/5584
Time
D2
1
0
0
0
1
Character 7
1
0
0
0
1
D1
0
1
1
1
0
D0
HEX
1E
31
51
71
9E