PD4437 OSRAM Opto Semiconductors Inc, PD4437 Datasheet - Page 9

• Manufacturer Part Number: PD4437
• Description: DISPLAY PROGR 4CHAR 5X7 BRT GRN
• Manufacturer: OSRAM Opto Semiconductors Inc
• Series: Alphanumeric Programmable Display™r

Specifications of PD4437

• Millicandela Rating: 90µcd
• Size / Dimension: 1.50" L x 0.82" W x 0.29" H (38.10mm x 20.83mm x 7.24mm)
• Color: Green
• Configuration: 5 x 7
• Number Of Digits: 4
• Character Size: 0.45 in
• Illumination Color: Bright Green
• Wavelength: 565 nm
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 90 ucd
• Viewing Area (w X H): 11.43 mm x 6.86 mm
• Display Type: 5 x 7 Dot Matrix
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Forward (vf) Typ: -
• Internal Connection: -
• Lead Free Status / Rohs Status: Details
• Other names: 475-1424; PD4437; Q68000A8369

There are five registers within the display. Four of these registers
are used to hold the ASCII/attribute code of the four display char-
acters. The fifth register is the Control Word, which is used to blink,
blank, clear, or dim the entire display, or to change the presenta-
tion (attributes) of individual characters.
Adressing
The addresses within the display device are shown below. Digit 0
is the rightmost digit of the display, while digit 3 is on the left.
Although there is only one Control Word, it is duplicated at the four
address locations 0–3. Data can be read from any of these loca-
tions. When one of these locations is written to, all of them will
change together.
Bit D7 of any of the display digit locations is used to allow an at-
tribute to be assigned to that digit. The attributes are discussed in
the next section. If Bit D7 is set to a one, that character will be dis-
played using the attribute. If bit D7 is cleared, the character will dis-
play normally.
Control Word Format
2006-01-23
Address
A2
0
1
1
1
1
A1
X
0
0
1
1
A0
X
0
1
0
1
D7
0
1
Clear
Clear
Standard operation
Clear entire display
D7
Contents
Control Word
Digit 0 (rightmost)
Digit 1
Digit 2
Digit 3 (leftmost)
D6
0
1
Lamp
Lamp Test
Standard operation
Display all dots at 50% brightness
Test
D6
D5
0
1
Blink
Blink
Blink attribute disabled
Blink entire display
D5
D4
0
1
Attribute
Attribute Enable
Disable above attributes
Enable above attributes
Enable
D4
D3
0
0
1
1
9
D2
0
1
0
1
Control Word
When address bit A2 is taken low, the Control Word is accessed.
The same Control Word appears in all four of the lower address
spaces of the display. Through the Control Word, the display can
be cleared, the lamps can be tested, display brightness can be
selected, and attributes can be set for any characters which have
been loaded with their most significant bit (D7) set high.
Brightness (D0, D1): The state of the lower two bits of the Control
Word are used to set the brightness of the entire display, from 0%
to 100%. The table below shows the correspondence of these bits
to the brightness.
Attributes (D2–D4): Bits D2, D3, and D4 control the visual
attributes (i.e., blinking) of those display digits which have been
written with bit D7 set high. In order to use any of the four
attributes, the Cursor Enable bit (D4 in the Control Word) must be
set. When the Cursor Enable bit is set, and bit D7 in a character
location is set, the character will take on one of the following dis-
play attributes.
D3
D7
0
0
0
0
X = don't care
Attributes
Attributes
Display cursor instead
of character
Blink character
Display blinking cursor
instead of character
Alternate character
with cursor
D6
0
0
0
0
D2
D5
X
X
X
X
D4
X
X
X
X
PD243X, PD353X, PD443X
D1
Brightness
D3
X
X
X
X
D1 D0 Brightness
0
0
1
1
0
1
0
1
D2
X
X
X
X
0% (blank)
25%
50%
100%
D0
IDCW5163
D1
0
0
1
1
D0
0
1
0
1
Operation
Blank
25% brightness
50% brightness
Full brightness