HP HDSP-2504 Eight character 5 mm and 7 mm smart alphanumeric display Datasheet

Eight Character 5 mm and 7 mm
Smart Alphanumeric Displays
Technical Data
HDSP-210X Series
HDSP-211X Series
HDSP-250X Series
Features
• X Stackable (HDSP-21XX)
• XY Stackable (HDSP-250X)
• 128 Character ASCII
Decoder
• Programmable Functions
• 16 User Definable
Characters
• Multi-Level Dimming and
Blanking
• TTL Compatible CMOS IC
• Wave Solderable
Applications
• Computer Peripherals
• Industrial Instrumentation
• Medical Equipment
• Portable Data Entry Devices
• Cellular Phones
• Telecommunications
Equipment
• Test Equipment
Description
The HDSP-210X/-211X/-250X
series of products is ideal for
applications where displaying
eight or more characters of dot
matrix information in an
aesthetically pleasing manner is
required. These devices are
8-digit, 5 x 7 dot matrix, alphanumeric displays and are all
packaged in a standard 15.24 mm
(0.6 inch) 28 pin DIP. The onboard CMOS IC has the ability to
decode 128 ASCII characters
which are permanently stored in
ROM. In addition, 16 programmable symbols may be stored in
on-board ROM, allowing consider-
able flexibility for displaying
additional symbols and icons.
Seven brightness levels provide
versatility in adjusting the display
intensity and power consumption.
The HDSP-210X/-211X/-250X
products are designed for
standard microprocessor interface
techniques. The display and
special features are accessed
through a bidirectional 8-bit data
bus.
Device Selection Guide
Font Height
0.2 inches
AlGaAs
Red
HDSP-2107
High Efficiency
Red
HDSP-2112
Orange
HDSP-2110
Yellow
HDSP-2111
Green
HDSP-2113
0.27 inches
HDSP-2504
HDSP-2502
HDSP-2500
HDSP-2501
HDSP-2503
2
Package Dimensions
Absolute Maximum Ratings
Supply Voltage, VDD to Ground[1] ........................................ -0.3 to 7.0 V
Operating Voltage, VDD to Ground[2] .............................................. 5.5 V
Input Voltage, Any Pin to Ground .............................. -0.3 to VDD +0.3 V
Free Air Operating Temperature Range, TA[3] ................ -45°C to +85°C
Storage Temperature Range, TS .................................. -55°C to +100°C
Relative Humidity (non-condensing) ............................................... 85%
Maximum Solder Temperature
(Below Seating Plane), t < 5 sec .............................................. 260°C
ESD Protection @ 1.5 kΩ, 100 pF ........................ VZ = 4 kV (each pin)
Notes:
1. Maximum Voltage is with no LEDs illuminated.
2. 20 dots ON in all locations at full brightness.
3. Maximum supply voltage is 5.25 V for operation above 70°C.
ESD WARNING: STANDARD CMOS HANDLING PRECAUTIONS SHOULD BE OBSERVED TO AVOID
STATIC DISCHARGE.
3
Package Dimensions
4
ASCII Character Set
HDSP-210X, HDSP-211X, HDSP-250X Series
Recommended Operating Conditions
Parameter
Supply Voltage
Symbol
Minimum
Nominal
Maximum
Units
VDD
4.5
5.0
5.5
V
5
Electrical Characteristics Over Operating Temperature Range (-45°C to +85°C)
4.5 V < VDD < 5.5 V, unless otherwise specified
Parameter
Symbol
TA = 25°C
VDD = 5.0 V
Typ.
Max.
-45°C < TA < + 85°C
4.5 V < VDD < 5.5 V
Min.
Max.
Units
Test Conditions
1.0
-1.0
µA
VIN = 0 to VDD,
pins CLK, D0-D7,
A0-A4
Input Leakage
(Input without pullup)
IIH
IIL
Input Current
(Input with pullup)
IIPL
-11
-18
-30
µA
VIN = 0 to VDD,
pins CLS, RST,
WR, RD, CE, FL
IDD (BLK)
0.5
3.0
4.0
mA
VIN = VDD
IDD 8 digits
12 dots/character[1,2]
IDD(V)
200
255
330
mA
“V” on in all 8
locations
IDD 8 digits
20 dots/character[1,2,3, 4]
IDD(#)
300
370
430
mA
“#” on in all
locations
IDD Blank
Input Voltage High
VIH
2.0
VDD
+0.3
V
Input Voltage Low
VIL
GND
-0.3 V
0.8
V
Output Voltage High
VOH
2.4
Output Voltage Low
D0-D7
VOL
Output Voltage Low
CLK
V
VDD = 4.5 V,
IOH = -40 µA
0.4
V
VDD = 4.5 V,
IOL = 1.6 mA
VOL
0.4
V
VDD = 4.5 V,
IOL = 40 µA
High Level Output
Current
IOH
-60
mA
VDD = 5.0 V
Low Level Output
Current
IOL
50
mA
VDD = 5.0 V
Thermal Resistance
IC Junction-to-Case
Rθ J-C
15
°C/W
Notes:
1. Average IDD measured at full brightness. See Table 2 in Control Word Section for IDD at lower brightness levels. Peak
IDD = 28/15 x IDD (#).
2. Maximum IDD occurs at -55°C.
3. Maximum IDD(#) = 355 mA at VDD = 5.25 V and IC TJ = 150°C.
4. Maximum IDD(#) = 375 mA at VDD = 5.5 V and IC TJ = 150°C.
6
Optical Characteristics at 25°C[1]
VDD = 5.0 V at Full Brightness
Description
AlGaAs
HER
Orange
Yellow
High
Performance
Green
Part
Number
HDSP-2107
-2504
HDSP-2112
-2502
HDSP-2110
-2500
HDSP-2111
-2501
HDSP-2113
-2503
Luminous Intensity
Character Average (#)
Iv (mcd)
Min.
Typ.
5.0
15.0
Peak
Wavelength
λPeak
(nm)
645
Dominant
Wavelength
λd
(nm)
637
2.5
7.5
635
626
2.5
7.5
600
602
2.5
7.5
583
585
2.5
7.5
568
574
Note: 1. Refers to the initial case temperature of the device immediately prior to measurement.
AC Timing Characteristics Over Temperature Range (-45°C to +85 °C)
4.5 V < VDD < 5.5 V, unless otherwise specified
Reference
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
Symbol
tACC
tACS
tCE
tACH
tCER
tCES
tCEH
tW
tWSU
tWH
tR
tRD
tDF
tRC
Description
Display Access Time
Write
Read
Address Setup Time to Chip Enable
Chip Enable Active Time[2,3]
Write
Read
Address Hold Time to Chip Enable
Chip Enable Recovery Time
Chip Enable Active Prior to Rising Edge of [2,3]
Write
Read
Chip Enable Hold Time to Rising Edge of
Read/Write Signal[2,3]
Write Active Time
Data Write Setup Time
Data Write Hold Time
Chip Enable Active Prior to Valid Data
Read Active Prior to Valid Data
Read Data Float Delay
Reset Active Time[4]
Min.[1]
Units
210
230
10
ns
ns
140
160
20
60
ns
ns
ns
140
160
ns
0
100
50
20
160
75
10
300
ns
ns
ns
ns
ns
ns
ns
ns
Notes:
1. Worst case values occur at an IC junction temperature of 150° C.
2. For designers who do not need to read from the display, the Read line can be tied to VDD and the Write and Chip Enable lines can be
tied together.
3. Changing the logic levels of the Address lines when CE = “0” may cause erroneous data to be entered into the Character RAM,
regardless of the logic levels of the WR and RD lines.
4. The display must not be accessed until after 3 clock pulses (110 µs min. using the internal refresh clock) after the rising edge of the
reset line.
7
AC Timing Characteristics Over Temperature Range (-45°C to +85°C)
4.5 V < VDD < 5.5 V, unless otherwise specified
Symbol
Description
25°C Typ.
Min.[1]
Units
FOSC
Oscillator Frequency
57
28
kHz
FRF[2]
Display Refresh Rate
256
128
Hz
FFL[3]
Character Flash Rate
2
1
Hz
tST[4]
Self Test Cycle Time
4.6
9.2
sec
Notes:
1. Worst case values occur at an IC junction temperature of 150°C.
2. F = F
/224
RF
OSC
3. FFL = FOSC /28,672
4. tST = 262,144/FOSC
Write Cycle Timing Diagram
8
Read Cycle Timing Diagram
Relative Luminous Intensity vs. Temperature
HER HDSP-2112/2502
YELLOW HDSP-2111/2501
HDSP-2113/2503
9
Electrical Description
Pin Function
Description
RESET (RST, pin 1)
Initializes the display.
FLASH (FL, pin 2)
FL low indicates an access to the Flash RAM and is unaffected by the
state of address lines A3-A4.
ADDRESS INPUTS
(A0-A4, pins 3-6, 10)
Each location in memory has a distinct address. Address inputs (A0-A2)
select a specific location in the Character RAM, the Flash RAM or a
particular row in the UDC (User-Defined Character) RAM. A3-A4 are
used to select which section of memory is accessed. Table 1 shows the
logic levels needed to access each section of memory.
Table 1. Logic Levels to Access Memory
Section of Memory
FL
A4
A3
A2 A1 A0
Flash RAM
0
X
X
Char. Address
UDC Address Register
1
0
0
Don't Care
UDC RAM
1
0
1
Row Address
Control Word Register
1
1
0
Don’t Care
Character RAM
1
1
1
Character Address
CLOCK SELECT
(CLS, pin 11)
Used to select either an internal (CLS = 1) or external (CLS = 0) clock source.
CLOCK INPUT/OUTPUT
(CLK, pin 12)
Outputs the master clock (CLS = 1) or inputs a clock (CLS = 0) for slave
displays.
WRITE (WR, pin 13)
Data is written into the display when the WR input is low and the
CE input is low.
CHIP ENABLE (CE, pin 17)
Must be at a logic low to read or write data to the display and must go
high between each read and write cycle.
READ (RD, pin 18)
Data is read from the display when the RD input is low and the CE
input is low.
DATA Bus (D0-D7,
pins 19, 20, 23-28)
Used to read from or write to the display.
GND (SUPPLY) (pin 15)
Analog ground for the LED drivers.
GND (LOGIC) (pin 16)
Digital ground for internal logic.
VDD (POWER) (pin 14)
Positive power supply input.
Figure 1. HDSP-210X/-211X/-212X/-250X Internal Block Diagram.
10
11
Display Internal Block
Diagram
Figure 1 shows the internal block
diagram of the HDSP-210X/
-211X/-250X displays. The CMOS
IC consists of an 8 byte Character
RAM, an 8 bit Flash RAM, a 128
character ASCII decoder, a 16
character UDC RAM, a UDC
Address Register, a Control Word
Register, and refresh circuitry
necessary to synchronize the
decoding and driving of eight 5 x
7 dot matrix characters. The
major user-accessible portions of
the display are listed below:
Character RAM
This RAM stores either ASCII character data or a UDC RAM address.
Flash RAM
This is a 1 x 8 RAM which stores Flash data.
User-Defined Character RAM
(UDC RAM)
This RAM stores the dot pattern for custom characters.
User-Defined Character
Address Register
(UDC Address Register)
This register is used to provide the address to the UDC RAM when
the user is writing or reading a custom character.
Control Word Register
This register allows the user to adjust the display brightness, flash
individual characters, blink, self test, or clear the display.
Character Ram
Figure 2 shows the logic levels
needed to access the
HDSP-210X/-211X/-250X
Character RAM. During a normal
access, the CE = “0” and either
RD = “0” or WR = “0.” However,
erroneous data may be written
into the Character RAM if the
address lines are unstable when
CE = “0” regardless of the logic
levels of the RD or WR lines.
Address lines A0-A2 are used to
select the location in the Character RAM. Two types of data can
be stored in each Character RAM
location: an ASCII code or a UDC
RAM address. Data bit D7 is used
to differentiate between the ASCII
character and a UDC RAM
address. D7 = 0 enables the ASCII
decoder and D7 = 1 enables the
UDC RAM. D0-D6 are used to
input ASCII data and D0-D3 are
used to input a UDC address.
Figure 2. Logic Levels to Access the Character RAM.
12
UDC RAM and UDC Address
Register
Figure 3 shows the logic levels
needed to access the UDC RAM
and the UDC Address Register.
The UDC Address Register is
eight bits wide. The lower four
bits (D0-D3) are used to select one
of the 16 UDC locations. The
upper four bits (D4-D7) are not
used. Once the UDC address has
been stored in the UDC Address
Register, the UDC RAM can be
accessed.
To completely specify a 5 x 7
character, eight write cycles are
required. One cycle is used to
store the UDC RAM address in the
UDC Address Register and seven
cycles are used to store dot data
in the UDC RAM. Data is entered
by rows and one cycle is needed
to access each row. Figure 4
shows the organization of a UDC
character assuming the symbol to
be stored is an “F.” A0-A2 are used
to select the row to be accessed
and D0-D4 are used to transmit
the row dot data. The upper three
bits (D5-D7) are ignored. D0 (least
significant bit) corresponds to the
right most column of the 5 x 7
matrix and D4 (most significant
bit) corresponds to the left most
column of the 5 x 7 matrix.
Flash RAM
Figure 5 shows the logic levels
needed to access the Flash RAM.
The Flash RAM has one bit
associated with each location of
the Character RAM. The Flash
input is used to select the Flash
RAM while address lines A3-A4 are
ignored. Address lines A0-A2 are
used to select the location in the
Flash RAM to store the attribute.
D0 is used to store or remove the
flash attribute. D0 = “1” stores
the attribute and D0 = “0”
removes the attribute.
Figure 3. Logic Levels to Access a UDC Character.
C
C
O
O
L
L
1
2
D4 D3
1
1
1
0
1
0
1
1
1
0
1
0
1
0
IGNORED
C
O
L
3
D2
1
0
0
1
0
0
0
C
O
L
4
D1
1
0
0
1
0
0
0
C
O
L
5
D0
1
0
0
0
0
0
0
ROW 1
ROW 2
ROW 3
ROW 4
ROW 5
ROW 6
ROW 7
UDC
CHARACTER
* * * * *
*
*
* * * *
*
*
*
HEX
CODE
1F
10
10
1D
10
10
10
0 = LOGIC 0; 1 = LOGIC 1; * = ILLUMINATED LED.
Figure 4. Data to Load ""F'' into the UDC RAM.
When the attribute is enabled
through bit 3 of the Control Word
and a “1” is stored in the Flash
RAM, the corresponding
character will flash at approxi-
mately 2 Hz. The actual rate is
dependent on the clock frequency.
For an external clock the flash
rate can be calculated by dividing
the clock frequency by 28,672.
13
Figure 5. Logic Levels to Access the Flash RAM.
Control Word Register
Figure 6 shows how to access the
Control Word Register. This 8-bit
register performs five functions:
Brightness control, Flash RAM
control, Blinking, Self Test, and
Clear. Each function is
independent of the others; however, all bits are updated during
each Control Word write cycle.
Brightness (Bits 0-2)
Bits 0-2 of the Control Word
adjust the brightness of the
display. Bits 0-2 are interpreted
as a three bit binary code with
code (000) corresponding to
maximum brightness and code
(111) corresponding to a blanked
display. In addition to varying the
display brightness, bits 0-2 also
vary the average value of IDD. IDD
can be calculated at any brightness level by multiplying the
percent brightness level by the
value of IDD at the 100% brightness level. These values of IDD are
shown in Table 2.
Flash Function (Bit 3)
Bit 3 determines whether the
flashing character attribute is on
or off. When bit 3 is a“1,” the
output of the Flash RAM is
checked. If the content of a location in the Flash RAM is a “1,” the
associated digit will flash at
Figure 6. Logic Levels to Access the Control Word
Register
Table 2. Current Requirements at
Different Brightness Levels VDD = 5.0 V
Symbol
IDD (V)
D2
0
0
0
0
1
1
1
D1
0
0
1
1
0
0
1
%
D0 Brightness
0
100
1
80
0
53
1
40
0
27
1
20
0
13
approximately 2 Hz. For an
external clock, the blink rate can
be calculated by driving the clock
frequency by 28,672. If the flash
enable bit of the Control Word is
a “0,” the content of the Flash
RAM is ignored. To use this
function with multiple display
systems, see the Display Reset
section.
Blink Function (Bit 4)
Bit 4 of the Control Word is used
to synchronize blinking of all
Current at 25°C
Typ.
200
160
106
80
54
40
26
Units
mA
mA
mA
mA
mA
mA
mA
eight digits of the display. When
this bit is a “1” all eight digits of
the display will blink at approximately 2 Hz. The actual rate is
dependent on the clock frequency.
For an external clock, the blink
rate can be calculated by dividing
the clock frequency by 28,672.
This function will override the
Flash function when it is active.
To use this function with multiple
display systems, see the Display
Reset section.
14
Self Test Function (Bits 5, 6)
Bit 6 of the Control Word Register
is used to initiate the self test
function. Results of the internal
self test are stored in bit 5 of the
Control Word. Bit 5 is a read only
bit where bit 5 = “1” indicates a
passed self test and bit 5 = “0”
indicates a failed self test.
Setting bit 6 to a logic 1 will start
the self test function. The built-in
self test function of the IC
consists of two internal routines
which exercise major portions of
the IC and illuminate all of the
LEDs. The first routine cycles the
ASCII decoder ROM through all
states and performs a checksum
on the output. If the checksum
agrees with the correct value, bit
5 is set to “1.” The second routine
provides a visual test of the LEDs
using the drive circuitry. This is
accomplished by writing
checkered and inverse checkered
patterns to the display. Each
pattern is displayed for approximately 2 seconds.
During the self test function the
display must not be accessed. The
time needed to execute the self
test function is calculated by
multiplying the clock period by
262,144. For example, assume a
clock frequency of 58 KHz, then
the time to execute the self test
function frequency is equal to
(262,144/58,000) = 4.5 second
duration.
At the end of the self test function, the Character RAM is loaded
with blanks, the Control Word
Register is set to zeros except for
bit 5, the Flash RAM is cleared,
and the UDC Address Register is
set to all ones.
Clear Function (Bit 7)
Bit 7 of the Control Word will
clear the Character RAM and the
Flash RAM. Setting bit 7 to a “1”
will start the clear function. Three
clock cycles (110 ms minimum
using the internal refresh clock)
are required to complete the clear
function. The display must not be
accessed while the display is
being cleared. When the clear
function has been completed, bit
7 will be reset to a “0.” The ASCII
character code for a space (20H)
will be loaded into the Character
RAM to blank the display and the
Flash RAM will be loaded with
“0”s. The UDC RAM, UDC
Address Register, and the remainder of the Control Word are
unaffected.
Display Reset
Figure 7 shows the logic levels
needed to Reset the display. The
display should be Reset on
Power-up. The external Reset
clears the Character RAM, Flash
RAM, Control Word and resets
the internal counters. After the
rising edge of the Reset signal,
three clock cycles (110 µs
minimum using the internal
refresh clock) are required to
complete the reset sequence. The
display must not be accessed
while the display is being reset.
The ASCII Character code for a
Figure 7. Logic Levels to Reset the
Display.
space (20H) will be loaded into
the Character RAM to blank the
display. The Flash RAM and
Control Word Register are loaded
with all “0”s. The UDC RAM and
UDC Address Register are
unaffected. All displays which
operate with the same clock
source must be simultaneously
reset to synchronize the Flashing
and Blinking functions.
Mechanical and Electrical
Considerations
The HDSP-210X/-211X/-250X are
28 pin dual-in-line packages with
26 external pins. The devices can
be stacked horizontally and vertically to create arrays of any size.
The HDSP-210X/-211X/-250X are
designed to operate continuously
from -45°C to +85°C with a
maximum of 20 dots on per
character at 5.25 V. Illuminating
all thirty-five dots at full brightness is not recommended.
The HDSP-210X/-211X/-250X are
assembled by die attaching and
wire bonding 280 LED chips and
a CMOS IC to a thermally
conductive printed circuit board.
A polycarbonate lens is placed
over the PC board creating an air
gap over the LED wire bonds. A
protective cap creates an air gap
over the CMOS IC. Backfill epoxy
environmentally seals the display
package. This package
construction makes the display
highly tolerant to temperature
cycling and allows wave
soldering.
The inputs to the IC are protected
against static discharge and input
current latchup. However, for
best results standard CMOS
handling precautions should be
15
used. Prior to use, the HDSP210X/-211X/-250X should be
stored in antistatic tubes or in
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 buildup. Input
current latchup is caused when
the CMOS inputs are subjected to
either 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.
Thermal Considerations
The HDSP-210X/-211X/-212X/
250X have been designed to
provide a low thermal resistance
path for the CMOS IC to the 26
package pins. Heat is typically
conducted through the traces of
the printed circuit board to free
air. For most applications no
additional heatsinking is
required.
Measurements were made on a 32
character display string to
determine the thermal resistance
of the display assembly. Several
display boards were constructed
using 0.062 in. thick printed
circuit material, and one ounce
copper 0.020 in. traces. Some of
the device pins were connected to
a heatsink formed by etching a
copper area on the printed circuit
board surrounding the display. A
maximally metallized printed
circuit board was also evaluated.
The junction temperature was
measured for displays soldered
directly to these PC boards,
displays installed in sockets, and
finally displays installed in
sockets with a filter over the
display to restrict airflow. The
results of these thermal
resistance measurements, RθJ-A
are shown in Table 3 and include
the effects of RθJ-C.
Ground Connections
Two ground pins are provided to
keep the internal IC logic ground
clean. The designer can, when
necessary, route the analog
ground for the LED drivers
separately from the logic ground
until an appropriate ground plane
is available. On long interconnections between the display and the
host system, the designer can
keep voltage drops on the analog
ground from affecting the display
logic levels by isolating the two
grounds.
The logic ground should be
connected to the same ground
potential as the logic interface
circuitry. The analog ground and
the logic ground should be
connected at a common ground
which can withstand the current
introduced by the switching LED
drivers. When separate ground
connections are used, the analog
ground can vary from -0.3 V to
+0.3 V with respect to the logic
ground. Voltage below -0.3 V can
cause all dots to be on. Voltage
above +0.3 V can cause dimming
and dot mismatch.
Soldering and Post Solder
Cleaning Instructions for
the HDSP-210X/-211X/
-250X
The HDSP-210X/-211X/-250X
may be hand soldered or wave
soldered with SN63 solder. When
hand soldering, it is recommended that an electronically
temperature controlled and
securely grounded soldering iron
be used. For best results, the iron
tip temperature should be set at
315°C (600°F). For wave soldering, a rosin-based RMA flux can
be used. The solder wave temperature should be set at 245°C ±
5°C (473°F ± 9°F), and the dwell
in the wave should be set
between 11 /2 to 3 seconds for
optimum soldering. The preheat
temperature should not exceed
105°C (221°F) as measured on
the solder side of the PC board.
Table 3. Thermal Resistance, θJA, Using Various Amounts of
Heatsinking Material
Heatsinking
Metal
per Device
sq. in.
W/Sockets W/O Sockets
W/O Filter W/O Filter
(Avg.)
(Avg.)
W/Sockets
W/Filter
(Avg.)
Units
0
1
3
Max. Metal
31
31
30
29
30
28
26
25
35
33
33
32
°C/W
°C/W
°C/W
°C/W
4 Board Avg
30
27
33
°C/W
For additional information on
soldering and post solder cleaning, see Application Note 1027,
Soldering LED Components.
Contrast Enhancement
The objective of contrast
enhancement is to provide good
readability in a variety of ambient
lighting conditions. For information on contrast enhancement see
Application Note 1015, Contrast
Enhancement Techniques for
LED Displays.
www.semiconductor.agilent.com
Data subject to change.
Copyright © 1999 Agilent Technologies, Inc.
Obsoletes 5964-6378E
5968-7907E (11/99)
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