AGILENT HPDL-2416

H
Four Character Smart
Alphanumeric Displays
Technical Data
HPDL-1414
HPDL-2416
Features
• Smart Alphanumeric Display
Built-in RAM, ASCII Decoder
and LED Drive Circuitry
• Wide Operating Temperature
Range
-40°C to +85°C
• Fast Access Time
160 ns
• Excellent ESD Protection
Built-in Input Protection Diodes
• CMOS IC for Low Power
Consumption
• Full TTL Compatibility Over
Operating Temperature
Range
VIL = 0.8 V
VIH = 2.0 V
• Wave Solderable
• Rugged Package
Construction
• End-Stackable
• Wide Viewing Angle
Typical Applications
• Portable Data Entry Devices
• Medical Equipment
•
•
•
•
•
Process Control Equipment
Test Equipment
Industrial Instrumentation
Computer Peripherals
Telecommunication
Instrumentation
Description
The HPDL-1414 and 2416 are
smart, four character, sixteensegment, red GaAsP displays. The
HPDL-1414 has a character
height of 2.85 mm (0.112"). The
HPDL-2416 has a character
height of 4.10 mm (0.160"). The
on-board CMOS IC contains
memory, ASCII decoder, multiplexing circuitry and drivers. The
monolithic LED characters are
magnified by an immersion lens
which increases both character
size and luminous intensity. The
encapsulated dual-in-line package
provides a rugged, environmentally sealed unit.
The HPDL-1414 and 2416
incorporate many improvements
over competitive products. They
have a wide operating temperature range, very fast IC access
time, and improved ESD protection. The displays are also fully
TTL compatible, wave solderable,
and highly reliable. These
displays are ideally suited for
industrial and commercial
applications where a goodlooking, easy-to-use alphanumeric
display is required.
ESD WARNING: STANDARD CMOS HANDLING PRECAUTIONS SHOULD BE OBSERVED
WITH THE HPDL-1414 AND HPDL-2416.
5964-6381E
3-175
Absolute Maximum Ratings
Supply Voltage, VDD to Ground ...................................... -0.5 V to 7.0 V
Input Voltage, Any Pin to Ground ........................ -0.5 V to VDD + 0.5 V
Free Air Operating Temperature Range, TA[1] ............... -40°C to +85°C
Relative Humidity (non-condensing) at 65°C ................................. 90%
Storage Temperature, TS .............................................. -40°C to +85°C
Maximum Solder Temperature, 1.59 mm (0.063 in.)
below Seating Plane, t < 5 sec. ................................................ 260°C
ESD Protection @ 1.5 kΩ, 100 pF ...................... VZ = 2 kV (each Pin)
*All typicals at TA = 25°C.
Package Dimensions
HPDL-1414
3-176
HPDL-2416
Recommended Operating Conditions
Parameter
Supply Voltage
Sym.
VDD
Min.
4.5
Nom.
5.0
Max.
5.5
Units
V
3-177
DC Electrical Characteristics over Operating Temperature Range
Parameter
Input Current
HPDL-1414
HPDL-2416
IDD Blank
HPDL-1414
HPDL-2416
IDD 4 Digits ON
(10 Segments/digit)[2,3]
HPDL-1414
HPDL-2416
IDD 4 Digits ON Cursor[4]
HPDL-2416
Input Voltage High
Input Voltage Low
Power Dissipation[5]
HPDL-1414
HPDL-2416
Sym.
IIL
Min.
25°C
Typ.
25°C
Max.
Max.[1]
Units
Test Conditions
17
17
30
30
50
40
µA
µA
VDD = 5.0 V, BL = 0.8 V
1.2
1.5
2.3
3.5
4.0
8.0
mA
mA
VDD = 5.0 V, BL = 0.8 V
70
85
125
90
115
165
130
170
232
mA
mA
mA
VDD = 5.0 V
VDD
0.8
V
V
715
910
mW
mW
IDD (BL)
IDD
IDD(CU)
VIH
VIL
PD
2.0
GND
350
425
450
575
VDD = 5.0 V
VDD = 5.0 V
Notes:
1. VDD = 5.5 V.
2. “%” illuminated in all four characters.
3. Measured at five seconds.
4. Cursor character is sixteen segments and DP ON.
5. Power Dissipation = (VDD)(IDD) for 10 segments ON.
Optical Characteristics at 25°C[6]
Parameter
Peak Luminous Intensity per Digit,
8 segments ON (character average)
HPDL-1414
HPDL-2416
Peak Wavelength
Dominant Wavelength
Off Axis Viewing Angle
HPDL-1414
HPDL-2416
3-178
Sym.
IV Peak
λPeak
λd
Min.
Typ.
Units
0.4
0.5
1.0
1.25
655
640
mcd
mcd
nm
nm
± 40
± 50
degrees
degrees
Test Conditions
VDD = 5.0 V,
“*” illuminated in all
4 digits
AC Timing Characteristics over Operating Temperature Range at VCC = 4.5 V
Parameter
Address Setup Time
Write Delay Time
Write Time
Data Setup Time
Data Hold Time
Address Hold Time
Chip Enable Hold Time[1]
Chip Enable Setup Time[1]
Clear Time[1]
Access Time
Refresh Rate
Symbol
tAS
tWD
tW
tDS
tDH
tAH
tCEH
tCES
tCLR
-20°C tMIN
90
10
80
40
40
40
40
90
2.4
130
420-790
25°C tMIN
115
15
100
60
45
45
45
115
3.5
160
310-630
70°C tMIN
150
20
130
80
50
50
50
150
4.0
200
270-550
Units
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
Hz
Note:
1. HPDL-2416 only.
Timing Diagram
3-179
Character Set
Magnified Character Font Description
HPDL-1414
Relative Luminous Intensity vs. Temperature
3-180
HPDL-2416
Electrical Description
Display Internal Block
Diagram HPDL-1414
Figure 1 shows the internal block
diagram of the HPDL-1414. It
consists of two parts: the display
LEDs and the CMOS IC. The
CMOS IC consists of a four-word
ASCII memory, a 64-word character generator, 17 segment drivers,
four digit drivers, and the
scanning circuitry necessary to
multiplex the four monolithic
LED characters. In normal
operation, the divide-by-four
counter sequentially accesses
each of the four RAM locations
and simultaneously enables the
appropriate display digit driver.
The output of the RAM is decoded
by the character generator which,
in turn, enables the appropriate
display segment drivers. Sevenbit ASCII data is stored in RAM.
Since the display uses a 64character decoder, half of the
possible 128 input combinations
are invalid. For each display
location where D5 = D6 in the
ASCII RAM, the display character
is blanked.
Data Entry HPDL-1414
Figure 2 shows a truth table for
the HPDL-1414. Data is loaded
into the display through the
DATA inputs (D6-D0), ADDRESS
inputs (A1-A0), and WRITE (WR).
After a character has been
written to memory, the IC
decodes the ASCII data, drives
the display and refreshes it
without any external hardware or
software.
Figure 1. HPDL-1414 Internal Block Diagram.
3-181
If the clear input (CLR) equals
zero for one internal display cycle
(4 ms minimum), the data in the
ASCII RAM will be rewritten with
zeroes and the display will be
blanked. Note that the blanking
input (BL) must be equal to
logical one during this time.
Figure 2. HPDL-1414 Write Truth Table.
Display Internal Block
Diagram HPDL-2416
Figure 3 shows the internal block
diagram for the HPDL-2416
display. The CMOS IC consists of
a four-word ASCII memory, a
four-word cursor memory, a
64-word character generator, 17
segment drivers, four digit
drivers, and the scanning circuitry
necessary to multiplex the four
monolithic LED characters. In
normal operation, the divide-byfour counter sequentially
accesses each of the four RAM
locations and simultaneously
enables the appropriate display
digit driver. The output of the
RAM is decoded by the character
generator which, in turn, enables
the appropriate display segment
drivers. For each display location,
the cursor enable (CUE) selects
whether the data from the ASCII
RAM (CUE = 0) or the stored
cursor (CUE = 1) is to be
displayed. The cursor character is
denoted by all sixteen segments
and the DP ON. Seven-bit ASCII
data is stored in RAM. Since the
display utilizes a 64-character
3-182
decoder, half of the possible 128
input combinations are invalid.
For each display location where
D5 = D6 in the ASCII RAM, the
display character is blanked. The
entire display is blanked when
BL = 0.
Data is loaded into the display
through the data inputs (D6 - D0),
address inputs (A1, A0), chip
enables (CE1, CE2), cursor select
(CU), and write (WR). The cursor
select (CU) determines whether
data is stored in the ASCII RAM
(CU = 1) or cursor memory
(CU = 0). When CE1 = CE2 =
WR = 0 and CU = 1, the information on the data inputs is stored
in the ASCII RAM at the location
specified by the address inputs
(A1, A0). When CE1 = CE2 = WR
= 0 and CU = 0, information on
the data input, D0, is stored in the
cursor at the location specified by
the address inputs (A1, A0). If D0
= 1, a cursor character is stored
in the cursor memory. If D0 = 0,
a previously stored cursor
character will be removed from
the cursor memory.
Data Entry HPDL-2416
Figure 4 shows a truth table for
the HPDL-2416 display. Setting
the chip enables (CE1, CE2) to
their low state and the cursor
select (CU) to its high state will
enable data loading. The desired
data inputs (D6-D0) and address
inputs (A1, A0) as well as the chip
enables (CE1, CE2) and cursor
select (CU) must be held stable
during the write cycle to ensure
that the correct data is stored
into the display. Valid ASCII data
codes are shown in Figure 1. The
display accepts standard sevenbit ASCII data. Note that D6 ≠ D5
for the codes shown in Figure 4.
If D6 = D5 during the write cycle,
then a blank will be stored in the
display. Data can be loaded into
the display in any order. Note
that when A1 = A0 = 0, data is
stored in the furthest right-hand
display location.
Cursor Entry HPDL-2416
As shown in Figure 4, setting the
chip enables (CE1, CE2) to their
low state and the cursor select
(CU) to its low state will enable
cursor loading. The cursor
character is indicated by the
display symbol having all 16
segments and the DP ON. The
least significant data input (D0),
the address inputs (A1, A0), the
chip enables (CE1, CE2), and the
cursor select (CU) must be held
stable during the write cycle to
Figure 3. HPDL-2416 Internal Block Diagram.
3-183
ensure that the correct data is
stored in the display. If D0 is in a
low state during the write cycle,
then a cursor character will be
removed at the indicated
location. If D0 is in a high state
during the write cycle, then a
cursor character will be stored at
the indicated location. The
presence or absence of a cursor
character does not affect the
ASCII data stored at that location.
Again, when A1 = A0 = 0, the
cursor character is stored in the
furthest right-hand display
location.
(CUE) is high. Similarly, the
stored ASCII data words are
displayed, regardless of the
cursor characters, if the cursor
enable (CUE) is low. The cursor
enable (CUE) has no effect on the
storage or removal of the cursor
characters within the display. A
flashing cursor is displayed by
pulsing the cursor enable (CUE).
For applications not requiring a
cursor, the cursor enable (CUE)
can be connected to ground and
the cursor select (CU) can be
connected to VCC. This inhibits
the cursor function and allows
only ASCII data to be loaded into
the display.
All stored cursor characters are
displayed if the cursor enable
Function
Write
Data
Memory
BL CLR CUE CU
L
X
X
X
H
X
Display Clear HPDL-2416
As shown in Figure 4, the ASCII
data stored in the display will be
cleared if the clear (CLR) is held
low and the blanking input (BL)
is held high for 4 ms minimum.
The cursor memory is not
affected by the clear (CLR) input.
Cursor characters can be stored
or removed even while the clear
(CLR) is low. Note that the
display will be cleared regardless
of the state of the chip enables
(CE1, CE2). However, to ensure
that all four display characters
are cleared, CLR should be held
low for 4 ms following the last
write cycle.
CE1
CE2
WR
A1
A0
D6
D5
D4
D3
D2
D1
D0
DIG3
L
L
L
L
L
L
L
L
H
H
L
H
L
H
a
b
c
d
a
b
c
d
a
b
c
d
a
b
c
d
a
b
c
d
a
b
c
d
a
b
c
d
NC
NC
NC
H
-ORH
X
X
X
X
X
X
X
X
X
H
H
H
X
X
H
X
H
X
H
X
X
X
X
X
X
X
X
X
X
X
Write
Cursor
X
X
X
L
L
L
L
L
L
H
H
L
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
H
H
H
NC
NC
NC
L
L
H
H
L
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
NC
NC
NC
X
X
X
X
X
X
X
X
X
Disable
Cursor
Memory
X
X
X
X
X
X
X
X
X
L
X
X
X
L
L
L
L
L = LOGIC LOW INPUT
H = LOGIC HIGH INPUT
X = DON’T CARE
L
X
X
H
L
X
H
X
H
X
X
“a” = ASCII CODE CORRESPODING TO SYMBOL “
NC = NO CHANGE
= CURSOR CHARACTER (ALL SEGMENTS ON)
NC
NC
NC
Disable
Data
Memory
Write
Clear
Cursor
DIG2 DIG1 DIG0
NC
NC
NC
NC
NC
NC
Previously Written
Data
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
Previously Written
Cursor
”
Figure 4a. Cursor/Data Memory Write Truth Table.
Function
CUE
CU
CE1
CE2
WR
CUE
BL CLR
H
H
H
H
L
H
X
X
X
X
X
X
X
X
DIG3
DIG2
DIG1
DIG0
Display previously written data
Display previously written cursor
Clear
H
L
X
X
X
X
X*
Clear data memory, cursor memory
unchanged
*NOTE: CLR should be held low for 4 ms
following the last WRITE cycle to ensure
all data is cleared.
Blanking
L
X
X
X
X
Figure 4b. Displayed Data Truth Table.
3-184
X
X
Blank display, data and cursor"
memories unchanged.
Display Blank HPDL-2416
As shown in Figure 4, the display
will be blanked if the blanking
input (BL) is held low. Note that
the display will be blanked
regardless of the state of the chip
enables (CE1, CE2) or write (WR)
inputs. The ASCII data stored in
the display and the cursor
memory are not affected by the
blanking input. ASCII data and
cursor data can be stored even
while the blanking input (BL) is
low. Note that while the blanking
input (BL) is low, the clear (CLR)
function is inhibited. A flashing
display can be obtained by
applying a low frequency square
wave to the blanking input (BL).
Because the blanking input (BL)
also resets the internal display
multiplex counter, the frequency
applied to the blanking input
(BL) should be much slower than
the display multiplex rate. Finally,
dimming of the display through
the blanking input (BL) is not
recommended.
For further application information please consult Application
Note 1026.
Optical Considerations/
Contrast Enhancement
The HPDL-1414 and HPDL-2416
displays use a precision aspheric
immersion lens to provide
excellent readability and low offaxis distortion. For the HPDL1414, the aspheric lens produces
a magnified character height of
2.85 mm (0.112 in.) and a
viewing angle of ± 40°. For the
HPDL-2416, the aspheric lens
produces a magnified character
height of 4.1 mm (0.160 in.) and
a viewing angle of ± 50°. These
features provide excellent
readability at distances up to 1.5
metres (4 feet) for the HPDL-
1414 and 2 metres (6 feet) for
the HPDL-2416.
Each HPDL-1414/2416 display is
tested for luminous intensity and
marked with an intensity category
on the side of the display
package. To ensure intensity
matching for multiple package
applications, mixing intensity
categories for a given panel is not
recommended.
The HPDL-1414/2416 display is
designed to provide maximum
contrast when placed behind an
appropriate contrast enhancement filter. For further information on contrast enhancement,
see Hewlett-Packard Application
Note 1015.
Mechanical and Electrical
Considerations
The HPDL-1414/2416 are dual inline packages that can be stacked
horizontally and vertically to
create arrays of any size. These
displays are designed to operate
continuously between -40°C to
+85°C with a maximum of 10
segments on per digit.
During continuous operation of
all four Cursors the operating
temperature should be limited to
-40°C to +55°C. At temperatures
above +55°C, the maximum
number of Cursors illuminated
continuously should be reduced
as follows: No Cursors illuminated at operating temperatures
above 75°C. One Cursor can be
illuminated continuously at
operating temperatures below
75°C. Two Cursors can be
illuminated continuously at
operating temperatures below
68°C. Three Cursors can be
illuminated continuously at
operating temperatures below
60°C.
The HPDL-1414/2416 are assembled by die attaching and wire
bonding the four GaAsP/GaAs
monolithic LED chips and the
CMOS IC to a high temperature
printed circuit board. An
immersion lens is formed by
placing the PC board assembly
into a nylon lens filled with
epoxy. A plastic cap creates an
air gap to protect the CMOS IC.
Backfill epoxy environmentally
seals the display package. This
package construction provides
the display with a high tolerance
to temperature cycling.
The inputs to the CMOS IC are
protected against static discharge
and input current latchup.
However, for best results
standard CMOS handling
precautions should be used. Prior
to use, the HPDL-1414/2416
should be stored in anti-static
tubes or conductive material.
During assembly a grounded
conductive work area should be
used, and assembly personnel
should wear conductive wrist
straps. Lab coats made of
synthetic material should be
avoided since they are prone to
static charge build-up. Input
current latchup is caused when
the CMOS inputs are subjected
either to a voltage below ground
(VIN < ground) or to a voltage
higher than VDD (VIN > VDD) and
when a high current is forced into
the input. To prevent input
current latchup and ESD damage,
unused inputs should be
connected either to ground or to
VDD. Voltages should not be
applied to the inputs until VDD
has been applied to the display.
Transient input voltages should
be eliminated.
3-185
Soldering and Post Solder
Cleaning Instructions
The HPDL-1414/2416 may be
hand soldered or wave soldered
with SN63 solder. Hand soldering
may be safely performed only
with an electronically
temperature-controlled and
securely grounded soldering iron.
For best results, the iron tip
temperature should be set at
3-186
315°C (600°F). For wave
soldering, a rosin-based RMA flux
can be used. The solder wave
temperature should be
245°C ± 5°C (473°F ± 9°F),
and the dwell in the wave should
be set at 11/2 to 3 seconds for
optimum soldering. Preheat
temperature should not exceed
93°C (200°F) as measured on the
solder side of the PC board.
For further information on
soldering and post solder
cleaning, see Application Note
1027, Soldering LED
Components.