SCE5740, SCE5741, SCE5742, SCE5743, SCE5744, SCE5745

2006-03-30

13

Cascading Multiple Displays using only the SCE574x.

Multiple displays can be cascaded using the CLK SEL and CLK I/O pins (Figure „Cascading Multiple Displays using only the SCE574X“

(page 13)). The display designated as the MasterClock source should have its CLK SEL pin tied high and the slaves should have their

CLK SEL pins tied low. All CLK I/O pins should be tied together. One display CLK I/O can drive 15 slave CLK I/Os. Use RST to synchro-

nize all display counters.

Loading Data into the Display

Use following procedure to load data into the display:

1.

Power up the display.

2.

Bring RST low (600 ns duration minimum) to clear the Multi-

plex Counter, Address Register, Control Word

Register, User Ram and Data Register. The display will be

blank. Display brightness is set to 100%.

3.

If a different brightness is desired, load the proper brightness

opcode into the Control Word Register.

4.

Load the Digit Address into the display.

5.

Load display row and column data for the selected digit.

6.

Repeat steps 4 and 5 for all digits.

IDCD5030

RST

CLK SEL

Intelligent Display

CC

V

DATA

SDCLK

LOAD

14 more displays

in between

DATA

SDCLK

Decoder

Address

Address Decode 1-14

A0

A1

A3

RST

CLK I/O

Intelligent Display

DATA

RST

SDCLK

CLK I/O

LOAD

CLK SEL

Chip

0

15

A2

LD

CE

Data Contents for the Word “ABCD”

Step

D7

D6

D5

D4

D3

D2

D1

D0

Function

A

B (optional)

1

1

0

1

1

1

00

0

0

0

00

0

0

0

CLEAR

100% BRIGHTNESS

1

2

3

4

5

6

7

8

10

1

00

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

00

0

0

0

0

0

100

01

0

1

0

10

0

0

1

11

1

1

1

1

0

001

1

0

001

10

0

0

1

DIGIT D0 SELECT

ROW 0 (A)

ROW 1 (A)

ROW 2 (A)

ROW 3 (A)

ROW 4 (A)

ROW 5 (A)

ROW 6 (A)

9

10

11

12

13

14

15

16

1

0

1

00

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

001

1

1

111

1

0

001

10

0

0

1

11

1

1

0

10

0

0

1

10

0

0

1

11

1

1

1

DIGIT D1 SELECT

ROW 0 (B)

ROW 1 (B)

ROW 2 (B)

ROW 3 (B)

ROW 4 (B)

ROW 5 (B)

ROW 6 (B)

17

18

19

20

21

22

23

24

1

0

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

00

0

1

0

0

0

111

0

1

000

10

0

0

0

10

0

0

0

1

0

000

01

0

0

0

00

1

1

1

DIGIT D2 SELECT

ROW 0 (C)

ROW 1 (C)

ROW 2 (C)

ROW 3 (C)

ROW 4 (C)

ROW 5 (C)

ROW 6 (C)

25

26

27

28

29

30

31

32

1

0

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

011

11

1

1

0

10

0

0

1

1

0

001

10

0

0

1

10

0

0

1

1

0

001

1

1

110

DIGIT D3 SELECT

ROW 0 (D)

ROW 1 (D)

ROW 2 (D)

ROW 3 (D)

ROW 4 (D)

ROW 5 (D)

ROW 6 (D)