HCMS-2819
High Performance CMOS 5x7 AlphaNumeric InGaN Blue Display
Data Sheet
Description
This product is a high performance, easy to use dot matrix
display driven by on-board CMOS IC. Each display can be
directly interfaced with a microprocessor, thus eliminat-
ing the need for cumbersome interface components.
The serial IC interface allows higher character count
information displays with a minimum of data lines. The
5x7 pixel format allows the user great freedom to gener-
ate user-defined characters. This product is stackable in
the x- and y-directions, making it ideal for high character
count displays
Features
x
Easy to Use
x
Interfaces Directly with Microprocessors
x
0.15" Character Height in 8 Character Package
x
Rugged X- and Y-Stackable Package
x
Serial Input
x
Convenient Brightness Controls
x
Wave Solderable
x
Low Power CMOS Technology
x
TTL Compatible
Applications
x
Telecommunications Equipment
x
Portable Data Entry Devices
x
Computer Peripherals
x
Medical Equipment
x
Test Equipment
x
Business Machines
x
Avionics
x
Industrial Controls
Package Dimensions
35.56 (1.400) MAX.
2.22 (0.087) SYM.
4.45
TYP.
(0.175)
26
PIN FUNCTION
ASSIGNMENT TABLE
7
10.16 (0.400) MAX.
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
FUNCTION
NO PIN
NO PIN
V LED
NO PIN
NO PIN
NO PIN
GND LED
NO PIN
NO PIN
V LED
NO PIN
NO PIN
NO PIN
DATA IN
RS
NO PIN
CLOCK
CE
BLANK
GND LOGIC
SEL
V LOGIC
NO PIN
RESET
OSC
DATA OUT
3.71
(0.146) TYP.
0
1
3
2
3
4
5
6
2.11 (0.083) TYP.
PIN # 1 IDENTIFIER
PART NUMBER
DATE CODE (YEAR, WEEK)
INTENSITY CATEGORY
COLOR BIN
COUNTRY OF ORIGIN
0.25
(0.010)
0.51
(0.020)
HCMS-281X
YYWW
X
Z
COO
5.08 (0.200)
4.32
(0.170) TYP.
2.54
(0.100) SYM.
0.51 ± 0.13
TYP.
(0.020 ± 0.005)
2.54 ± 0.13
(0.100 ± 0.005) TYP.
(NON ACCUM.)
1.27
SYM.
(0.050)
7.62
(0.300)
NOTES:
1. DIMENSIONS ARE IN mm (INCHES).
2. UNLESS OTHERWISE SPECIFIED, TOLERANCE ON DIMENSIONS IS ± 0.38 mm (0.015 INCH).
3. LEAD MATERIAL: SOLDER PLATED COPPER ALLOY.
Figure 1. HCMS-2819 package dimension
Device Selection Guide
Description
8 Digit 0.15” Character Height
HCMS-2819
Absolute Maximum Ratings
Logic Supply Voltage, V
LOGIC
to GND
LOGIC
LED Supply Voltage, V
LED
to GND
LED
Input Voltage, Any Pin to GND
Free Air Operating Temperature Range T
A
Relative Humidity (non-condensing)
Storage Temperature, T
S
Maximum Solder Temperature
Solder Dipping
Wave Soldering
ESD Protection @ 1.5 k:, 100pF (each pin)
TOTAL Package Power Dissipation at T
A
=25°C
-0.3V to 7.0V
-0.3V to 5.5V
-0.3V to V
LOGIC
+0.3V
-40qC to +85qC
85%
-55qC to 100qC
260qC for 5 sec
250qC for 3 sec
Class 1, 0-1999V
2.4 W
Notes:
For operation in high ambient temperatures, see Appendix A, Thermal Considerations.
2
Recommend Operating Conditions Over Temperature Range (-40°C to +85°C)
Parameter
Logic Supply Voltage
[1]
LED Supply Voltage
[1]
GND
LED
to GND
LOGIC
Symbol
V
LOGIC
V
LED
-
Min.
3.0
4.5
-0.3
Max.
5.5
5.5
+0.3
Units
V
V
V
Notes:
For further description, see Appendix B, Electrical Considerations, “VLOGIC and VLED Considerations”.
Electrical Characteristics Over Operating Temperature Range (-40°C to +85°C)
T
A
= 25°C,
V
LOGIC
= 5.0V
Parameter
Input Leakage Current
I
LOGIC
OPERATING
I
LOGIC
SLEEP
[1]
I
LED
BLANK
I
LED
SLEEP
[1]
Peak Pixel
Current
[2]
HIGH level
input voltage
LOW level
input voltage
HIGH level
output voltage
LOW level
output voltage
Thermal Resistance
-40°C< T
A
<85°C
3.0V<V
LOGIC
<5.5V
Typ
-5.0
Symbol
II
I
LOGIC
(OPT)
I
LOGIC
(SLP)
I
LED
(BL)
I
LED
(SLP)
I
PIXEL
V
ih
V
il
Typ
0.8
10
4.0
15.0
14.0
Max
+15
5
30
8.0
50
20
Max
+100
10
50
8.0
100
23
Units
PA
mA
PA
mA
PA
mA
V
Test Conditions
V
IN
= 0 TO V
LOGIC
V
IN
= V
LOGIC
V
IN
= V
LOGIC
BL = 0 V
V
LED
= 5.5 V All pixels
ON,Average value per pixel
4.5V<V
LOGIC
<5.5V
3.0V<V
LOGIC
<4.5V
4.5V<V
LOGIC
<5.5V
3.0V<V
LOGIC
<4.5V
2.0
0.8 V
LOGIC
0.8
0.2 V
LOGIC
V
V
oh
2.0
0.8 V
LOGIC
V
V
LOGIC
= 4.5V, Ioh = -40μA
3.0V<V
LOGIC
<4.5V
V
ol
RT
J-P
70
0.4
0.2 V
LOGIC
V
V
LOGIC
= 4.5V, Ioh = -40μA
3.0V<V
LOGIC
<4.5V
IC junction to pin
°C/W
Notes:
1. In SLEEP mode, the internal oscillator and reference current for LED drivers are off.
2. Average peak pixel current is measured at the maximum drive current set by Control Register 0. Individual pixels may exceed this value.
Optical Characteristics at 25 ± 1 °C
[1]
V
LED
= 5.0V, 100% Peak Current, 100% Pulse Width
Luminous Intensity per LED
[2]
Character Average (μcd)
Display Color
Blue
Min
29
Typical
170
Peak
Wavelength
O
Peak
(nm) Typ.
456
Dominant
Wavelength
O
d [3]
(nm) Typ.
460
Notes:
1. Refers to the initial case temperature of the device immediately prior to measurement.
2. Measured with all LEDs illuminated in a digit.
3. Dominant wavelength, ld, is derived from the CIE Chromaticity diagram and represents the single wavelength which defines the perceived LED
color.
3
Electrical Description
Pin Function Description
RESET (RST)
DATA IN (D
IN
)
DATA OUT (D
OUT
)
CLOCK (CLK)
REGISTER SELECT (RS)
CHIP ENABLE (CE)
OSCILLATOR SELECT
OSCILLATOR (OSC)
BLANK (BL)
GND
LED
GND
LOGIC
V
LED
V
LOGIC
Sets Control Register bits to logic low. The Dot Register contents are unaffected by the Reset
pin. (logic low = reset; logic high = normal operation)
Serial Data input for Dot or Control Register data. Data is entered on the rising edge of the Clock
input.
Serial Data out put for Dot or Control Register data. This pin is used for cascading multiple
displays.
Clock input for writing Dot or Control Register data. When Chip Enable is logic low, data is
entered on the rising Clock edge.
Selects Dot Register (RS = logic low) or Control Register (RS = logic high) as the destination for
serial data entry. The logic level of RS is latched on the falling edge of the Chip Enable input.
This input must be a logic low to write data to the display. When CE returns to logic high and
CLK is logic low, data is latched to either the LED output drivers or a Control Register.
Selects either an internal or external display oscillator source. (SEL) (logic low = External Display
Oscillator; logic high = Internal Display Oscillator).
Output for the Internal Display Oscillator (SEL = logic high) or input for an External Display Oscil-
lator (SEL = logic low).
Blanks the display when logic high. May be modulated for brightness control.
Ground for LED drivers
Ground for logic.
Positive supply for LED drivers
Positive supply for logic.
4
AC Timing Characteristics Over Temperature Range (-40 to +85°C)
Timing
Diagram
Ref. Number
1
2
3
4
5
6
7
8
9
10
11
12
4.5V<V
LOGIC
<5.5V
Description
Register Select Setup Time to Chip Enable
Register Select Hold Time to Chip Enable
Rising Clock Edge to Falling Chip Enable Edge
Chip Enable Setup Time to Rising Clock Edge
Chip Enable Hold Time to Rising Clock Edge
Data Setup Time to Rising Clock Edge
Data Hold Time after Rising Clock Edge
Rising Clock Edge to DOUT
[1]
Propagation Delay DIN to DOUT
Simultaneous Mode for one IC
[1,2]
CE Falling Edge to DOUT Valid
Clock High Time
Clock Low Time
Reset Low Time
Clock Frequency
Internal Display Oscillator Frequency
Internal Refresh Frequency
External Display Oscillator Frequency
Prescaler = 1
Prescaler = 8
V
LOGIC
= 3V
Min
10
10
20
55
20
10
10
Symbol
t
rss
t
rsh
t
clkce
t
ces
t
ceh
t
ds
t
dh
t
dout
t
doutp
t
cedo
t
clkh
t
clkl
t
rstl
F
cyc
F
inosc
F
rf
F
exosc
Min
10
10
20
35
20
10
10
10
Max
Max
Units
ns
ns
ns
ns
ns
ns
ns
40
18
25
10
65
30
45
ns
ns
ns
ns
ns
ns
80
80
50
5
80
150
51.2
410
210
410
1000
8000
100
100
50
4
80
150
51.2
410
210
410
1000
8000
MHz
kHz
Hz
kHz-
kHz
Notes:
1. Timing specifications increase 0.3ns per pf of capacitive loading above 15pF.
2. This parameter is valid for Simultaneous Mode data entry of the Control Register.
Display Overview
The HCMS-281x blue LED displays are driven by on-board
CMOS ICs. The LEDs are configured as 5x7 font characters
and are driven in groups of 4 characters per IC. Each IC
consists of a 160-bit shift register (the Dot Register), two
7-bit Control Words, and refresh circuitry. The Dot Register
contents are mapped on a one-to-one basis to the display.
Thus, an individual Dot Register bit uniquely controls a
single LED.
8-character displays have two ICs that are cascaded. The
Data Out line of the first IC is internally connected to
the Data In line of the second IC forming a 320-bit Dot
Register. The display’s other control and power lines are
connected directly to both ICs.
Reset
Reset initializes the Control Register (sets all Control
Register bits to logic low) and places the display in the
sleep mode. The Reset pin shoud be connected to the
system power on reset circuit. The Dot Registers are not
cleared upon power-on or by Reset. After power-on, the
Dot Register contents are random; however, Reset will put
the display in sleep mode, thereby blanking the LEDs. The
Control Register and the Control Words are cleared to all
zeros by Reset.
To operate the display after being Reset, load the Dot
Register with logic lows. Then load Control Word 0 with
the desired brightness level and set the sleep mode bit
to logic high.
5
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