参数资料
型号: SCE5785
厂商: SIEMENS A G
元件分类: 显示用LED
英文描述: 5X7 DOT MATRIX DISPLAY, SOFT ORANGE, 4.57 mm
封装: PLASTIC, DIP-26
文件页数: 10/13页
文件大小: 295K
代理商: SCE5785
2–192
SCE5780/1/2/3/4/5
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 1FH
Row 2
00H to 1FH
Row 3
00H to 1FH
Row 4
00H to 1FH
Row 5
00H to 1FH
Row 6
00H to 1FH
Operation of the SCE578X
The SCE578X display consists of two CMOS ICs containing
control logic and drivers for eight 5x7 characters. The rst IC
controls characters 0 through 3 and the second IC controls
characters 4 through 7. These components 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 efcient intercon-
nection between the display and the mother board. The
SCE578X requires a minimum three input lines as compared
to fourteen for an equivalent eight character parallel input
part.
The on-board CMOS IC is the electronic heart of the display.
Each IC accepts serially formatted data, which is stored in the
internal RAM. The IC accepts data based on the character
address selected. The rst IC is selected when addressing
characters 0 through 3, the second IC is selected when
addressing characters 4 though 7, and both ICs are selected
when the Control Word is addressed.
Asynchronously the RAM is read by the character multiplexer
at a strobe rate that results in a icker free display. Figure 6
shows the three functional areas of the IC. These include: the
input serial data register and control logic, a 140 bit two port
RAM, and an internal multiplexer/display driver. The second
IC is identical except characters 4 though 7 are driven.
1=Display dot “On”
0=Display dot “Off’
Figure 6. Block Diagram
SD CLK
SData
Load
Serial Data
Register
Reset
CLKSEL
CLK I/O
Counter Chain
& Timing Logic
Oscillator
Y
Address
Decode
Display Multiplexer
Row Decoder
& Driver
0 1 23
4 5 6 7
140 Bit RAM
Write 28 X 5
Read 7 X 20
IC 1
IC 2
4 – 5 X 7
Characters
4 – 5 X 7
Characters
Column
Drivers
Digits
0 To 3
X Address Decode
3 Bit Address
Register
6 Bit Control
Word Register
Control Word Logic
VDIM Controls
MUX
Rate
The second IC has the same
function diagram as IC 1
IC 2 controls characters 4 To 7
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