SCD55100A, SCD55101A, SCD55102A, SCD55103A, SCD55104A

2006-02-20

11

For further information refer to Appnotes 18 and 19 at www.osram-os.com

An alternative to soldering and cleaning the display modules is to use sockets. Naturally, 28 pin DIP sockets 7.62 mm (0.300") wide with

2.54 mm (0.100") centers work well for single displays. Multiple display assemblies are best handled by longer SIP sockets or DIP sockets

when available for uniform package alignment. Socket manufacturers are Aries Electronics, Inc., Frenchtown, NJ; Garry Manufacturing,

New Brunswick, NJ; Robinson-Nugent, New Albany, IN; and Samtec Electronic Hardward, New Albany, IN.

For further information refer to Appnote 22 at www.osram-os.com

Optical Considerations

The 3.683 mm (0.145") high character of the SCD5510XA gives readability up to eight feet. Proper filter selection enhances readability

over this distance.

Using filters emphasizes the contrast ratio between a lit LED and the character background. This will increase the discrimination of differ-

ent characters. The only limitation is cost. Take into consideration the ambient lighting environment for the best cost/benefit ratio for filters.

Incandescent (with almost no green) or fluorescent (with almost no red) lights do not have the flat spectral response of sunlight. Plastic

band-pass filters are an inexpensive and effective way to strengthen contrast ratios. The SCD5510A/2A are red/high efficiency red dis-

plays and should be matched with long wavelength pass filter in the 570 nm to 590 nm range. The SCD55103A/4A should be matched

with a yellow-green band-pass filter that peaks at 565 nm. For displays of multiple colors, neutral density grey filters offer the best compro-

mise.

SCD Interface with Siemens/Intel 8031 Microprocessor

(using serial port in mode 0)

IDCD5221

XTAL2

RxD

18

10

19

XTAL1

RST

9

17

P3.7

13

P3.3

P3.4

14

8031

U1

TxD

11

CLK LOAD

DATA

CC

V

40

SCD

CC

V

1

Master

CC

V

SD

26

913

14

28

27

23

20

19

16

15

15

DATA

LOAD

2

CLK

1

SD

6

9

13

14

Slave

SCD

27

28

23

20

19

16

TAN

0.01 µF

+

22 µF