
SCF5740, SCF5742, SCF5744
2006-01-23
9
The user can activate four Control functions. These include: LED
Brightness Level, Prescaler, IC Power Down, or Display Clear.
OPCODEs and six bit words are used to initiate these functions.
The OPCODEs and Control Words for the Character Address and
Loading Column Data are shown in Tables Load Character
The user can select eight specific LED brightness levels, Tables
Display Brightness“ (page 9). Depending on how D3 is selected
either one (1) for maximum peak current or zero (0) for 12.5% of
maximum peak current in the control word per Tables Display
Brightness“ (page 9), the user can select 16 specific LED bright-
ness levels. These brightness levels (in percentages of full bright-
ness of the display) include: 100% (E0
HEX or E8 HEX), 53% (E1HEX
or E9
HEX), 40% (E2HEX or EA HEX), 27% (E3HEX or EB HEX), 20%
(E4
HEX or EC HEX), 13% (E5HEX or ED HEX), and 6.6% (E6HEX or
EE
HEX), 0.0% (E7 HEX or EF HEX). The brightness levels are con-
trolled by changing the duty factor of the row strobe pulse.
Row and Column Location
The SCF574X offers a unique Display Power Down feature which
reduces I
CC to less than 50 A. When EFHEX is loaded, as shown in
Table Power Down“ (page 9), the display is set to 0% brightness
and the internal multiplex clock is stopped. 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.
Load Character Address
Op code
D7 D6 D5
Character Address
D4 D3
D2
D1
D0
Hex
Operation
Load
10
1
00
0
A0
Character 0
10
1
00
0
1
A1
Character 1
10
1
00
0
1
0
A2
Character 2
10
1
00
0
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
IDXX5189
Row 2
Row 3
Row 4
Row 5
Row 6
01
2
3
4
On LED
Off LED
Columns
Row 0
Row 1
Previously "on" LED
Display Brightness
Op code
D7 D6 D5
Control Word
D4 D3
D2
D1
D0
Hex
Operation
Level
11
1
00
0
E0
100%
11
1
00
0
1
E1
53%
11
1
00
0
1
0
E2
40%
11
1
00
0
1
E3
27%
11
1
00
1
0
E4
20%
11
1
00
1
0
1
E5
13%
11
1
00
1
0
E6
6.6%
11
1
00
1
0
E7
0.0%
Display Brightness
Op code
D7 D6 D5
Control Word
D4 D3
D2
D1
D0
Hex
Operation
Level
11
1
01
0
E8
100%
11
1
01
0
1
E9
53%
11
1
01
0
1
0
EA
40%
11
1
01
0
1
EB
27%
11
1
01
1
0
EC
20%
11
1
01
1
0
1
ED
13%
11
1
01
1
0
EE
6.6%
11
1
11
1
0
EF
0.0%
Power Down
Op code
D7 D6 D5
Control Word
D4 D3
D2
D1
D0
Hex
Operation
Level
11
1
11
1
EF
0%
brightness