www.austriamicrosystems.com/LED-Driver-ICs/AS1108

Revision 2.13

11 - 20

AS1108

Datasheet - D e t a i l e d D e s c r i p t i o n

Display-Test Register (0xXF)

The AS1108 can operate in two modes: normal mode and display test mode. In display test mode all LEDs are

switched on at maximum brightness (duty cycle is 15/16). The device remains in display-test mode until the Display-

Test Register is set for normal operation.

Note: All settings of the Digit- and Control-Registers are maintained.

6

X

0

1

1

0

1

0

1

1

1

1

1

7

X

0

1

1

1

1

1

1

0

0

0

0

8

X

1

0

0

0

1

1

1

1

1

1

1

9

X

1

0

0

1

1

1

1

1

0

1

1

-

X

1

0

1

0

0

0

0

0

0

0

1

E

X

1

0

1

1

1

0

0

1

1

1

1

H

X

1

1

0

0

0

1

1

0

1

1

1

L

X

1

1

0

1

0

0

0

1

1

1

0

P

X

1

1

1

0

1

1

0

0

1

1

1

Blank

X

1

1

1

1

0

0

0

0

0

0

0

†

The decimal point is enabled by setting bit D7 = 1.

Table 11. HEX Font

7-Segment

Character

Register Data

On Segments = 1

D7

†

D6:D4

D3

D2

D1

D0

DP

†

A

B

C

D

E

F

G

0

X

0

0

0

0

1

1

1

1

1

1

0

1

X

0

0

0

1

0

1

1

0

0

0

0

2

X

0

0

1

0

1

1

0

1

1

0

1

3

X

0

0

1

1

1

1

1

1

0

0

1

4

X

0

1

0

0

0

1

1

0

0

1

1

5

X

0

1

0

1

1

0

1

1

0

1

1

6

X

0

1

1

0

1

0

1

1

1

1

1

7

X

0

1

1

1

1

1

1

0

0

0

0

8

X

1

0

0

0

1

1

1

1

1

1

1

9

X

1

0

0

1

1

1

1

1

0

1

1

A

X

1

0

1

0

1

1

1

0

1

1

1

b

X

1

0

1

1

0

0

1

1

1

1

1

C

X

1

1

0

0

1

0

0

1

1

1

0

d

X

1

1

0

1

0

1

1

1

1

0

1

E

X

1

1

1

0

1

0

0

1

1

1

1

F

X

1

1

1

1

1

0

0

0

1

1

1

†

The decimal point is enabled by setting bit D7 = 1.

Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines

D7

D6

D5

D4

D3

D2

D1

D0

Corresponding Segment Line

DP

A

B

C

D

E

F

G

Table 13. Display-Test Register Format (Address (HEX) = 0xXF))

Mode

Register Data

D7

D6

D5

D4

D3

D2

D1

D0

Normal Operation

X

X

X

X

X

X

X

0

Display Test Mode

X

X

X

X

X

X

X

1

Table 10. Code-B Font (Continued)

7-Segment

Character

Register Data

On Segments = 1

D7

†

D6:D4

D3

D2

D1

D0

DP

†

A

B

C

D

E

F

G