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SCF5740 Datasheet(PDF) 6 Page - Siemens Semiconductor Group

Part No. SCF5740
Description  0.270” 4-Character, 5x7 Dot Matrix Serial Input Dot Addressable Intelligent Display
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SCF5740 Datasheet(HTML) 6 Page - Siemens Semiconductor Group

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SCF5740/2/4
Display Column and Row Format
Column Data Ranges
C
0
C
1
C
2
C
3
C
4
Row 0
11111
Row 1
00100
Row 2
00100
Row 3
00100
Row 4
00100
Row 5
00100
Row 6
00100
Row 0
00H to 1FH
Row 1
00H to LFH
Row 2
00H to LFH
Row 3
00H to LFH
Row 4
00H to LFH
Row 5
00H to LFH
Row 6
00H to LFH
Operation of the SCF574X
The SCF574X display consists of a CMOS IC containing con-
trol logic and drivers for four 5x7 characters. Theres compo-
nents are assembled in a compact plastic package.
Individual LED dot addressability allows the user great free-
dom in creating special characters or mini-icons.
The serial data interface provides a highly efficient intercon-
nection between the display and the mother board. The
SCF574X requires only three lines as compared to 14 for an
equivalent four 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 charac-
ter multiplexer at a strobe rate that results in a flicker free dis-
play. Figure 6 shows the three functional areas of the IC.
These include: the input serial data register and control logic,
a 140 bits two port RAM, and an internal multiplexer/display
driver.
1=Display dot “On”
0=Display dot “Off’
Figure 6. Block Diagram
RST
CLKSEL
CLK I/O
Data
SDCLK
Load
V1
V2
Columns
0 to 20
User RAM
Memory
7x20 Bits
X Address Decode
3 Bit Address Register
6 Bit Control
Word Register
Control Word Logic
VDIM Controls
Column
Drivers
Digit
0 to 4
Display
OSC
– 7
Counter
Row Control Logic
and Row Drivers
Rows
0 to 6
0
1
2
3
– 64
Counter
Mux
Rate


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