SCF5740 OSRAM Opto Semiconductors Inc, SCF5740 Datasheet - Page 8

• Manufacturer Part Number: SCF5740
• Description: DISPLAY 4CHAR .270" 5X7 RED
• Manufacturer: OSRAM Opto Semiconductors Inc
• Series: Intelligent Display®r

Specifications of SCF5740

• Millicandela Rating: 55µcd
• Size / Dimension: 1.30" L x 0.79" W x 0.28" H (33.02mm x 20.07mm x 7mm)
• Color: Red
• Configuration: 5 x 7
• Number Of Digits: 4
• Character Size: 0.27 in
• Illumination Color: Red
• Wavelength: 650 nm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 55 ucd
• Viewing Area (w X H): 4.45 mm x 6.86 mm
• Display Type: 5 x 7 Dot Matrix
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Forward (vf) Typ: -
• Internal Connection: -
• Lead Free Status / Rohs Status: Details
• Other names: Q68000A8848

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 „Loading
Serial Character Data a“ (page 8). Figure „Loading Serial Charac-
ter Data b“ (page 8) shows that each character consist of eight
8 bit words. The first word encodes the display character location
and the succeeding seven bytes are row data. The row data repre-
sents the status (On, Off) of individual column LEDs. Figure „Load-
ing Serial Character Data c“ (page 8) shows that each 8 bit word is
formatted to represent Character Address, or Column Data.
Figure „Loading Serial Character Data d“ (page 8) 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 transition 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 „Loading Serial Character Data a“ (page 8),
a total of 256 bits of data are required to load all four characters
into the display.
The Character Address Register bits, D4–D0 (Table „Load Charac-
ter Address“ (page 9)), and Row Address Register bits, D7–D5
(Table „Load Column Data“ (page 9)) direct the Column Data bits,
D4–D0 (Table „Load Column Data“ (page 9)) to specific RAM loca-
Loading Serial Character Data
2006-01-23
a.
b.
d.
c.
Character 0
Character 0
Address
D0
0
Character Address
LOAD
Serial
Clock
DATA
D1
0
11 Clock Cycles, 2.2 µs
Character 1
D2
0
352 Clock Cycles, 70.4 µs
Row 0 Column
D3
0
Data
t 0
D4
0
Clock
Period
Example: Serial Clock = 5.0 MHz, Clock Period = 200 ns
D0
Character 2
D5
1
88 Clock Cycles, 17.6 µs
OPCODE
Row 1 Column
D6
0
D1
Data
D7
1
D2
600 ns(min)
Character 3
Between
Loads
Time
Row 2 Column
D3
Data
D0
D
D4
8
Column Data
D1
D
tion.
Table „Character ’D’“ (page 8) shows the Row Address for the
example character “D.” Column data is written and read asynchro-
nously from the 140 bit RAM. Once loaded the internal oscillator
and character multiplexer reads the data from the RAM. These
characters are row strobed with column data as shown in Figures
„Row and Column Location“ (page 9) and „Row Strobing“
(page 10). The character strobe rate is determined by the internal
or user supplied external MUX Clock and the IC’s ÷320 counter.
Character “D”
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
11 Clock Cycles, 2.2µs
Row 3 Column
D2
D
D5
Data
D3
D
D6
D4
D
Op code
D7
0
0
0
0
0
0
0
SCF5740, SCF5742, SCF5744
D5
Row 4 Column
0
OPCODE
D7
D6 D5
0
0
0
0
0
0
0
D6
0
Data
0
0
0
0
0
0
0
Time between LOADS
D7
0
600 ns(min)
Between
Column Data
D4
C0
1
1
1
1
1
1
1
Row 5 Column
Loads
Time
Data
D3
C1
1
0
0
0
0
0
1
D2
C2
1
0
0
0
0
0
1
Row 6 Column
D1
C3
1
0
0
0
0
0
1
Data
D0
C4
0
1
1
1
1
1
0
Hex
1E
11
11
11
11
11
1E