Datasheet

SCD55100A, SCD55101A, SCD55102A, SCD55103A, SCD55104A
2008-07-22 9
The user can activate four Control functions. These include: LED
Brightness Level, Lamp Test, IC Power Down, or Display Clear.
OPCODEs and five 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“ (
page 9) and „Load Column Data“ (page 9).
The user can select seven specific LED brightness levels, Table
„Display Brightness“ (
page 9). These brightness levels (in percent-
ages of full brightness of the display) include: 100% (F0
HEX
), 53%
(F1
HEX
), 40% (F2
HEX
), 27% (F3
HEX
), 20% (F4
HEX
), 13% (F5
HEX
),
and 6.6% (F6
HEX
). The brightness levels are controlled by chang-
ing the duty factor of the row strobe pulse.
Row and Column Location
The SCD5510XA offers a unique Display Power Down feature
which reduces I
CC
to less than 50 µA. When FF
HEX
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 dis
-
play is reactivated by loading a new Brightness Level Control Word
into the display.
The Lamp Test is enabled by loading F8
HEX
, Table „Lamp Test“
(
page 9), into the serial shift register. This Control Word sets all of
the LEDs to a 53% brightness level. Operation of the Lamp Test
has no affect on the RAM and is cleared by loading a Brightness
Control Word.
The Software Clear (C0
HEX
), given in Table „Software Clear“
(
page 9), clears the Address Register and the RAM. The display is
blanked and the Character Address Register will be set to Charac-
ter 0. The internal counter and the Control Word Register are unaf-
fected. 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
101 10 0 0 0 B0 Character 0
101 10 0 0 1 B1 Character 1
101 10 0 1 0 B2 Character 2
101 10 0 1 1 B3 Character 3
101 10 1 0 0 B4 Character 4
101 10 1 0 1 B5 Character 5
101 10 1 1 0 B6 Character 6
101 10 1 1 1 B7 Character 7
101 11 0 0 0 B8 Character 8
101 11 0 0 1 B9 Character 9
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
001 C0 C1 C2 C3 C4 Row 1
010 C0 C1 C2 C3 C4 Row 2
011 C0 C1 C2 C3 C4 Row 3
100 C0 C1 C2 C3 C4 Row 4
IDXX5187
Row 0
Row 1
Row 2
Row 3
Row 4
01234
Previously "on" LED
On LED
Off LED
Columns
Display Brightness
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 10 0 0 0 F0 100%
111 10 0 0 1 F1 53%
111 10 0 1 0 F2 40%
111 10 0 1 1 F3 27%
111 10 1 0 0 F4 20%
111 10 1 0 1 F5 13%
111 10 1 1 0 F6 6.6%
Power Down
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 11 1 1 1 FF 0%
brightness
Lamp Test
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
111 10 B B B Lamp Test
(OFF)
111 11 0 0 1 F8 Lamp Test
(OFF)
Software Clear
Op code
D7 D6 D5
Control Word
D4 D3 D2 D1 D0
Hex Operation
Level
110 00 0 0 0 C0 CLEAR