Preliminary

AS2591

Rev. 1.0

Page 8

May 1999

Digit Layout

a

b

c

d

e

f

g

yn

Figure 6: Digit Layout

COM1 - 4 = common backplane signals

S1_n, S2_n = segment signals

n = 0 is most right digit, n= 11 is most left digit for 12-digit displays,

and n = 15 is most left digit for 16-digit displays.

Table 3: Backplanes and segments

COM1

COM2

COM3

COM4

S1_n

a

f

e

yn

S2_n

b

g

c

d

Segment Allocation

Table 4: 12-digit display

Symbol

Address

y11

y10

y9

y8

y7

y6

y5

y4

y3

y2

y1

y0

AS2525

PG

RD

-

SH

BO

MR

Vol

LD

MF

MT

SP

KL

Digits

Normal

11

10

9

8

7

6

5

4

3

2

1

0

Upper 1

23

22

21

20

19

18

17

16

15

14

13

12

Upper 2

31

30

29

28

27

26

25

24

Table 5: 16-digit display

Symbol Addr.

y11

y10

y9

y8

y7

y6

y5

y4

y3

y2

y1

y0

AS2525

PG

RD

-

SH

BO

MR

Vol

LD

MF

MT

SP

KL

Digits Normal

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Digits Upper

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

The symbols in bold are always enabled and other symbols can be enabled through the serial interface. Symbols

will be displayed independently from selecting the upper bank of the 32 digit buffer to be displayed.

The AS2591 incorporates a buffer for 32 digits. Digits are entered from the most right position and shifted left by

new entries (see also Table 2: Commands).