Datasheet

SCE5780
2006-01-23 9
The user can activate four Control functions. These include: LED
Brightness Level, IC Power Down, Prescaler, 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
Address“ and „Load Column Data“.
The user can select eight specific LED brightness levels, Tables
„Display Brightness“. 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 Table „Display Brightness“, the
user can select 16 specific LED brightness levels. These bright-
ness levels (in percentages of full brightness of the display)
depending on how the user selects D3 can be one (1) or zero (0)
are as follows: 100% (E0
HEX
or E8
HEX
), 53% (E1
HEX
or E9
HEX
), 40%
(E2
HEX
or EA
HEX
), 27% (E3
HEX
or EB
HEX
), 20% (E4
HEX
or EC
HEX
),
13% (E5
HEX
or ED
HEX
), and 6.6% (E6
HEX
or EE
HEX
), 0.0% (E7
HEX
or
EF
HEX
). The brightness levels are controlled by changing the duty
factor of the row strobe pulse.
The SCE578X offers a unique Display Power Down feature which
reduces I
CC
to less than 150 mA total. When EF
HEX
is loaded
(Table „Power Down“) 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.
Row and Column Locations for a Character “D”
Load Character Address
Op code
D7 D6 D5
Character Address
D4 D3 D2 D1 D0
Hex Operation
Load
101 00000A0 Character 0
101 00001A1 Character 1
101 00010A2 Character 2
101 00011A3 Character 3
101 00100A4 Character 4
101 00101A5 Character 5
101 00110A6 Character 6
101 00111A7 Character 7
Load Column Data
Op code
D7 D6 D5
Column Data
D4 D3 D2 D1 D0
Operation
Load
000 C0 C1 C2 C3 C4 Row 0
000 C0 C1 C2 C3 C4 Row 1
000 C0 C1 C2 C3 C4 Row 2
000 C0 C1 C2 C3 C4 Row 3
000 C0 C1 C2 C3 C4 Row 4
000 C0 C1 C2 C3 C4 Row 5
000 C0 C1 C2 C3 C4 Row 6
Display Brightness
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 00000E0 100%
111 00001E1 53%
111 00010E2 40%
111 00011E3 27%
111 00100E4 20%
111 00101E5 13%
111 00110E6 6.6%
111 00111E7 0.0%
Display Brightness
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 01000E8 100%
111 01001E9 53%
111 01010EA 40%
111 01011EB 27%
111 01100EC 20%
111 01101ED 13%
111 01110EE 6.6%
111 01111EF 0.0%
Power Down
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 01111EF 0%
brightness
IDXX5191
Row 2
Row 3
Row 4
Row 5
Row 6
01234
Previously "on" LED
On LED
Off LED
Columns
Row 0
Row 1