HDSP-0760_08 Datasheet, PDF (6/8 Pages) AVAGO TECHNOLOGIES LIMITED – Hexadecimal and Numeric Displays for Industrial Applications

Operational Considerations
Electrical
These devices use a modified 4 x 7 dot matrix light emit-
ting diode to display decimal/hexa­decimal numeric
information. The high efficiency red and yellow LEDs are
GaAsP epitaxial layer on a GaP transparent substrate. The
green LEDs are GaP epitaxial layer on a GaP transparent
substrate. The LEDs are driven by constant current drivers,
BCD information is accepted by the display memory when
the enable line is at logic low and the data is latched
when the enable is at logic high. Using the enable pulse
width and data setup and hold times listed in the Recom-
mended Operating Conditions allows data to be clocked
into an array of displays at a 6.7 MHz rate.
The decimal point input is active low true and this data
is latched into the display memory in the same fashion
as the BCD data. The decimal point LED is driven by the
on-board IC.
The blanking control input on the hexadecimal displays
blanks (turns off ) the displayed informa­tion without dis-
turbing the contents of display memory. The display is
blanked at a minimum threshold level of 2.0 volts. When
blanked, the display standby power is nominally 250 mW
at T_A = 25°C.
Mechanical
The primary thermal path for power dissipation is through
the device leads. Therefore, to insure reliable operation
up to an ambient temperature of +85°C, it is important
to maintain a case-to-ambient thermal resistance of less
than 35°C watt/device as measured on top of display pin
3.
For information on soldering and post solder cleaning see
Applica­tion Note 1027, Soldering LED Components.
Contrast Enhancement
These display devices are designed to provide an
optimum ON/OFF contrast when placed behind an ap-
propriate contrast enhancement filter. For further infor-
mation, please refer to Application Note 1015, Contrast
Enhancement Techniques for LED Displays.
Over Range Display
The over range devices display “±1” and decimal point.
The character height and package configuration are the
same as the numeric and hexadecimal devices. Character
selection is obtained via external switching transistors
and current limiting resistors.
Package Dimensions
10.2
(0.400)
MAX.
D
8765
7.4 ^4.8
(0.29) ^(0.19)
1.5
(0.06)
5
1.9
(0.075)
1234
FRONT VIEW
13.5
4.8 (0.53)
(0.19)
3.3
(0.13)
NOTE: DIMENSIONS IN MILLIMETERS AND (INCHES).
PIN FUNCTION
1 Plus
2 Numeral One
3 Numeral One
4 DP
5 Open
6 Open
7 V_CC
8 Minus/Plus
       Pin
Character
1
2,3
4
8
+
1
X
X
1
-
0
X
X
1
1
X
1
X
X
Decimal Point
X
X
1
X
Blank
0
0
0
0
Notes:
0:  Line switching transistor in Figure 7 cutoff.
1:  Line switching transistor in Figure 7 saturated.
X: ‘don’t care’