SCE5740, SCE5741, SCE5742, SCE5743, SCE5744, SCE5745

2006-03-30

10

The user can select eight specific LED brightness levels (Table

„Display Brightness“ (page 10)) by changing the peak current driv-

ing the LEDs. The peak current is varied by varying the ON time of

the row drivers. Note that data line 3 is low (logic 0).

If dimming is required with finer control between 12.5% brightness

and 0.0% brightness, data line 3 can be set high (logic 1). The

12.5% peak current is now the brightness reference (100%-E8) for

further dimming and as shown in Table “Display Brightness“

(page 10) eight levels of dimming are provided. For example the

hex code EC in Table “Display Brightness“ (page 10) will provide a

brightness level 29% lower than the 12.5% brightness level.

The SCE574X offers a unique Display Power Down feature which

reduces I

Table „Power Down“ (page 10), the display is set to 0% brightness.

When in the Power Down mode data may still be written into the

RAM. The display is reactivated by loading a new Brightness Level

Control Word into the display.

The Software Clear (C0

(page 10), clears the Address Register and the RAM. The display

is blanked and the Character Address Register will be set to Char-

acter 0. The internal counter and the Control Word Register are

unaffected. The Software Clear will remain active until the next

data input cycle is initiated.

Load Character Address

Op code

D7 D6 D5

Character Address

D4 D3

D2

D1

D0

Hex

Operation

Load

10

1

00

0

0

0

A0

Character 0

10

1

00

0

0

1

A1

Character 1

10

1

00

0

1

0

A2

Character 2

10

1

00

0

1

1

A3

Character 3

Load Column Data

Op code

D7 D6 D5

Column Data

D4 D3

D2

D1

D0

Operation Load

00

0

C0 C1

C2

C3

C4

Row 0

00

0

C0 C1

C2

C3

C4

Row 1

00

0

C0 C1

C2

C3

C4

Row 2

00

0

C0 C1

C2

C3

C4

Row 3

00

0

C0 C1

C2

C3

C4

Row 4

00

0

C0 C1

C2

C3

C4

Row 5

00

0

C0 C1

C2

C3

C4

Row 6

Display Brightness

Op code

D7 D6 D5

Control Word

D4 D3

D2

D1

D0

Hex

Operation

Level

11

1

00

0

0

0

E0

100%

11

1

00

0

0

1

E1

53%

11

1

00

0

1

0

E2

40%

11

1

00

0

1

1

E3

27%

11

1

00

1

0

0

E4

20%

11

1

00

1

0

1

E5

13%

11

1

00

1

1

0

E6

6.6%

11

1

00

1

1

1

E7

0.0%

Power Down

Op code

D7 D6 D5

Control Word

D4 D3

D2

D1

D0

Hex

Operation

Level

11

1

01

1

1

1

EF

0%

brightness

Software Clear

Op code

D7 D6 D5

Control Word

D4 D3

D2

D1

D0

Hex

Operation

Level

11

0

00

0

0

0

C0

CLEAR