four character smart alphanumeric displays hdlx-1414 series technical data features ? dot matrix replacement of hpdl-1414 ? smart alphanumeric display built-in ram, ascii decoder, and led drive circuitry ? 128 ascii character set ? end stackable ? categorized for luminous intensity; yellow and green categorized for color ? low power and sunlight viewable algaas versions ? wide viewing angle (50? typical) description these are 3.7 mm (0.145 inch) four character 5 x 7 dot matrix displays driven by an on-board cmos ic. these displays are pin for pin compatible with the hpdl-1414. the ic stores and decodes 7-bit ascii data and displays it in an easy to read 5 x 7 font. multiplexing and led drive circuitry is also included in the display, and fast setup and hold times allow it to interface easily with common microprocessors. the address and data inputs can be directly connected to microprocessor address and data buses. the hdlx-1414 offers a larger character set than the hpdl-1414. lower case letters and special symbols are now offered, made possible by the 5 x 7 dot matrix character layout. the difference between the sunlight viewable hdls-1414 and the low power hdlu-1414 lies in the brightness level. the sunlight viewable version is internally set to provide high intensity characters. the low power version uses the same bright led technology, but reduces the current through each led to a much lower level, and maintains an intensity comparable to the hdlo-1414. esd warning: standard cmos handling precautions should be observed with the hdlx-1414. devices algaas red high efficiency red orange yellow green hdls-1414 (sun. view.) hdlo-1414 HDLA-1414 hdly-1414 hdlg-1414 hdlu-1414 (low power)
2 absolute maximum ratings supply voltage, v dd to ground [1] ................................. C0.5 v to 7.0 v input voltage, any pin to ground ........................ C0.5 v to v dd +0.5 v free air operating temperature range, t a ................ C40?c to +85?c storage temperature, t s .......................................... C40?c to +100?c cmos ic junction temperature ............................................... +150?c relative humidity (non-condensing) at +65?c .............................. 85% maximum solder temperature, 1.59 mm (0.063 in.) below seating plane, t < 5 sec. .......................... +260?c esd classification, r = 1.5 k w , c = 100 pf ....... class 1 (0 C 1999 v) note: 1. maximum voltage is with no leds illuminated. package dimensions pin no. function pin no. function 1
2
3
4
5
6 7
8
9
10
11
12 ground
d 0 data input
d 1 data input
d 2 data input
d 3 data input
d 6 data input d 5 data input
d 4 data input
wr write
a 1 digit select
a 0 digit select
v dd 17.66
(0.695) 4.45
(0.175) 20.12
(0.792) 9.14
(0.360) 0.51 ?0.13
(0.020 ?0.005) typ. 6.10
(0.240) 2.54
(0.100) typ. 15.30
(0.600) 0.25 ?0.13
(0.010 ?0.005) typ. dimensions are in millimeters (inches). pin 1 identifier 4.10
(0.160) hdlx-1414 yyww x z part number luminous intensity color bin [3] date code (year, week) 0.39
(0.015) typ. (2x) pin 1 typ.
3 character set ascii
code d0
d1
d2
d3
hex 0
0
0
0
0 d6 d5 d4 1
0
0
0
1 0
1
0
0
2 1
1
0
0
3 0
0
1
0
4 1
0
1
0
5 0
1
1
0
6 1
1
1
0
7 0
0
0
1
8 1
0
0
1
9 0
1
0
1
a 1
1
0
1
b 0
0
1
1
c 1
0
1
1
d 0
1
1
1
e 1
1
1
1
f 000 0 001 1 010 2 011 3 100 4 101 5 110 6 111 7 notes: 1 = high level
0 = low level
4 recommended operating conditions parameter symbol min. typ. max. units supply voltage v dd 4.5 5.0 5.5 v algaas red hdlu-1414 parameter symbol min. typ. units test conditions average luminous i v 1.2 3.1 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 645 nm dominant l d 637 nm wavelength [2] electrical/optical characteristics over operating temperature range 4.5 < v dd < 5.5 v (unless otherwise specified). 25?c [1] parameter symbol min. typ. max. max. units test conditions blank current i dd (blnk) 1.0 4.0 ma all digits blanked input current i i C40 10 m av in = 0 v to v dd v dd = 5.0 v input voltage high v ih 2.0 v dd v input voltage low v il gnd 0.8 v i dd 4 digits i dd (#) 110 130 160 ma # on in all four 20 dots/character [2,3] locations notes: 1. v dd = 5.0 v. 2. average i dd measured at full brightness. peak i dd = 28/15 x average i dd (#). 3. i dd (#) max. = 130 ma, 150?c ic junction temperature and v dd = 5.5 v. optical characteristics at 25?c [1] v dd = 5.0 v at full brightness algaas red hdls-1414 parameter symbol min. typ. units test conditions average luminous i v 4.0 12.7 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 645 nm dominant l d 637 nm wavelength [2]
5 high efficiency red hdlo-1414 parameter symbol min. typ. units test conditions average luminous i v 1.2 3.5 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 635 nm dominant l d 626 nm wavelength [2] orange HDLA-1414 parameter symbol min. typ. units test conditions average luminous i v 1.2 3.5 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 600 nm dominant l d 602 nm wavelength [2] yellow hdly-1414 parameter symbol min. typ. units test conditions average luminous i v 1.2 3.7 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 583 nm dominant l d 585 nm wavelength [2] green hdlg-1414 parameter symbol min. typ. units test conditions average luminous i v 1.2 5.6 mcd * illuminated in all four digits. intensity per digit, 19 dots on per digit. character average peak wavelength l peak 568 nm dominant l d 574 nm wavelength [2] notes: 1. refers to the initial case temperature of the device immediately prior to the light measurement. 2. dominant wavelength, l d , is derived from the cie chromaticity diagram, and represents the single wavelength which defines the color of the device.
6 ac timing characteristics over operating temperature range at v dd = 4.5 v parameter symbol min. units address setup t as 10 ns address hold t ah 40 ns data setup t ds 50 ns data hold t dh 40 ns write time t w 75 ns enlarged character font timing diagram t as t w t ah 2.0 v 0.8 v 2.0 v 0.8 v 2.0 v 0.8 v t ds t dh a 0 ?a 1 wr d 0 ?d 6 0.51 (0.020)
typ. 3.61 (0.142)
typ. 0.56 (0.022)
typ. 0.25 (0.010)
typ. 2.29 (0.090)
typ. notes:
1. unless otherwise specified, the
tolerance on all dimensions
is ?0.254 mm (0.010").
2. dimensions are in millimeters (inches).
7 display internal block diagram figure 2 shows the hdlx-1414 display internal block diagram. the cmos ic consists of a 4 x 7 character ram, a 128-character ascii decoder and the refresh circuitry necessary to synchronize the decoding and driving of four 5 x 7 dot matrix characters. four 7-bit ascii words are stored in the character ram. the ic reads the ascii data and decodes it vita the 128-character ascii decoder. this decoder includes the 64-character set of the hpdl- 1414, 32 lower case ascii symbols, and 32 foreign language symbols. electrical description pin function description \write wr must be logic 0 to store data in the (\wr, pin 3) display. address inputs a 0 and a 1 select a specific location in the (a 1 and a 0 , pins display memory. address 00 accesses the far 4 and 5) right character, and address 11 accesses the far left position. v dd v dd is the positive power supply input. (pin 6) ground ground is the display ground. (gnd, pin 7) data inputs d0Cd6 are used to specify the input data (d0Cd6, pins 1, for the display. 2, 8-12) data entry figure 1 shows a truth table for the hdlx-1414 display. address inputs a 0 and a 1 are used to select the digit location in the display. when a 0 and a 1 are both logic low, data is loaded into the right most character. data inputs d 0 Cd 6 are used to load information into the display. data is latched into the given character address on the rising edge of the \wr signal. data and address inputs must be held stable during the write cycle to ensure that correct data is stored in the display. mechanical and electrical considerations the hdlx-1414 is a 12-pin dip package that can be stacked to create a character array of any size. the display is designed to operate reliably in C40?c to +85?c ambient temperatures. the hdlx-1414 is assembled by die attaching and wire bonding 140 leds and a cmos ic to a high temperature printed circuit board. a polycarbonate lens is placed over the pc board, creating a protective air gap over the led wire bonds. backfill epoxy environmentally seals the display package. this package construction makes the display highly tolerant to temperature cycling and allows wave soldering. esd and latchup protection 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 hdlx-1414 should be stored in antistatic 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 can be caused when the cmos inputs are subjected either to a voltage below ground (v in < ground) or higher than v dd (v in > v dd ) 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 v dd . voltages should not be \ wr a1 a0 d6 d5 d4 d3 d2 d1 d0 function 1 xxxxxxxxxno change 0 0 0 digit 0 ascii data (right most character) 0 0 1 digit 1 ascii data 0 1 0 digit 2 ascii data 0 1 1 digit 3 ascii data (left most character) figure 1. display truth table 0 = logic 0; 1 = logic 1; x = do not care. write to character ram
8 figure 2. display internal block diagram. applied to the inputs until v dd has been turned on, and high transient input voltages should be eliminated. soldering instructions the hdlx-1414 is compatible with hand- and wave-solder processes. the use of a no-clean flux is recommended. the polycarbonate lens on these displays is incompatible with some fluxes and cleaning solutions. it is not recommended for use with heated terpene, or solutions of propylene glycol monomethyl ether and monoethanolamine. for further 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 the end users ambient lighting conditions. by using both luminance (brightness) and chrominance (color) contrast techniques, the on dots of the display can be made to stand out against a dark background. character ram ascii decoder write
address a 0 ?a 1 2 d 0 ?d 6 7 data in data
out 7 character
select column
data 5 3 row
select osc + 32 + 7 row
drivers display column
drivers row
select write (4 x 7) wr for further information on contrast enhancement, see application note 1015, contrast enhancement techniques for led displays .
9 intensity range (mcd) bin min. max. e 3.97 6.79 f 5.55 9.50 g 7.78 13.30 h 10.88 18.62 i 15.24 26.07 j 21.33 36.49 note: test conditions as specified in optical characteristic table. intensity bin limits for hdls-1414 intensity range (mcd) bin min. max. a 1.20 1.77 b 1.45 2.47 c 2.02 3.46 d 2.83 4.85 e 3.97 6.79 f 5.55 9.50 g 7.78 13.30 note: test conditions as specified in optical characteristic table. intensity bin limits for hdlx-1414 color range (nm) color bin min. max. green 1 576.0 580.0 2 573.0 577.0 3 570.0 574.0 4 567.0 571.5 yellow 3 581.5 585.0 4 584.0 587.5 5 586.5 590.0 6 589.0 592.5 note: test conditions as specified in optical characteristic table. color bin limits
www.semiconductor.agilent.com data subject to change. copyright ? 2001 agilent technologies, inc. july 11, 2001 obsoletes 5988-2802en 5988-3270en
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