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eight character 5 mm and 7 mm smart alphanumeric displays technical data 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, alpha- numeric displays and are all packaged in a standard 15.24 mm (0.6 inch) 28 pin dip. the on- board cmos ic has the ability to decode 128 ascii characters which are permanently stored in rom. in addition, 16 program- mable symbols may be stored in on-board rom, allowing consider- hdsp-210x series hdsp-211x series hdsp-250x series 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 algaas high efficiency font height red red orange yellow green 0.2 inches hdsp-2107 hdsp-2112 hdsp-2110 hdsp-2111 hdsp-2113 0.27 inches hdsp-2504 hdsp-2502 hdsp-2500 hdsp-2501 hdsp-2503
2 package dimensions esd warning: standard cmos handling precautions should be observed to avoid static discharge. absolute maximum ratings supply voltage, v dd to ground [1] ........................................ -0.3 to 7.0 v operating voltage, v dd to ground [2] .............................................. 5.5 v input voltage, any pin to ground .............................. -0.3 to v dd +0.3 v free air operating temperature range, t a [3] ................ -45 c to +85 c storage temperature range, t s .................................. -55 c to +100 c relative humidity (non-condensing) ............................................... 85% wave solder temperature 1.59 mm (0.063 in.) below body ............................. 250 c for 3 secs esd protection @ 1.5 k ? , 100 pf ........................ v z = 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.
3 package dimensions
4 ascii character set hdsp-210x, hdsp-211x, hdsp-250x series recommended operating conditions parameter symbol minimum nominal maximum units supply voltage v dd 4.5 5.0 5.5 v
5 electrical characteristics over operating temperature range (-45 c to +85 c) 4.5 v < v dd < 5.5 v, unless otherwise specified t a = 25 c -45 c < t a < + 85 c v dd = 5.0 v 4.5 v < v dd < 5.5 v parameter symbol typ. max. min. max. units test conditions input leakage i ih 1.0 av in = 0 to v dd , (input without pullup) i il -1.0 pins clk, d 0 -d 7 , a 0 -a 4 input current i ipl -11 -18 -30 av in = 0 to v dd , (input with pullup) pins cls, rst, wr, rd, ce, fl i dd blank i dd (blk) 0.5 3.0 4.0 ma v in = v dd i dd 8 digits i dd (v) 200 255 330 ma ??on in all 8 12 dots/character [1,2] locations i dd 8 digits i dd (#) 300 370 430 ma ??on in all 20 dots/character [1,2,3,4] locations input voltage high v ih 2.0 v dd v +0.3 input voltage low v il gnd 0.8 v -0.3 v output voltage high v oh 2.4 v v dd = 4.5 v, i oh = -40 a output voltage low v ol 0.4 v v dd = 4.5 v, d 0 -d 7 i ol = 1.6 ma output voltage low v ol 0.4 v v dd = 4.5 v, clk i ol = 40 a high level output i oh -60 ma v dd = 5.0 v current low level output i ol 50 ma v dd = 5.0 v current thermal resistance r j-c 15 c/w ic junction-to-case notes: 1. average i dd measured at full brightness. see table 2 in control word section for i dd at lower brightness levels. peak i dd = 28/15 x i dd (#). 2. maximum i dd occurs at -55 c. 3. maximum i dd (#) = 355 ma at v dd = 5.25 v and ic t j = 150 c. 4. maximum i dd (#) = 375 ma at v dd = 5.5 v and ic t j = 150 c.
6 optical characteristics at 25 c v dd = 5.0 v at full brightness luminous intensity peak dominant character average (#) wavelength wavelength part iv (mcd) peak d description number min. typ. (nm) (nm) algaas hdsp-2107 5.0 15.0 645 637 -2504 her hdsp-2112 2.5 7.5 635 626 -2502 orange hdsp-2110 2.5 7.5 600 602 -2500 yellow hdsp-2111 2.5 7.5 583 585 -2501 high hdsp-2113 2.5 7.5 568 574 performance -2503 green note: 1. refers to the initial case temperature of the device immediately prior to measurement. [1] ac timing characteristics over temperature range (-45 c to +85 c) 4.5 v < v dd < 5.5 v, unless otherwise specified reference number symbol description min. [1] units 1t acc display access time write 210 read 230 ns 2t acs address setup time to chip enable 10 ns 3t ce chip enable active time [2,3] write 140 read 160 ns 4t ach address hold time to chip enable 20 ns 5t cer chip enable recovery time 60 ns 6t ces chip enable active prior to rising edge of [2,3] write 140 read 160 ns 7t ceh chip enable hold time to rising edge of read/write signal [2,3] 0ns 8t w write active time 100 ns 9t wsu data write setup time 50 ns 10 t wh data write hold time 20 ns 11 t r chip enable active prior to valid data 160 ns 12 t rd read active prior to valid data 75 ns 13 t df read data float delay 10 ns t rc reset active time [4] 300 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 v dd and the write and chip enable lines can be tied together. 3. changing the logic levels of the address lines when ce = ??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 s 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 < v dd < 5.5 v, unless otherwise specified write cycle timing diagram symbol description 25 c typ. min. [1] units f osc oscillator frequency 57 28 khz f rf [2] display refresh rate 256 128 hz f fl [3] character flash rate 2 1 hz t st [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 rf = f osc /224 3. f fl = f osc /28,672 4. t st = 262,144/f osc input pulse levels: 0.6 v to 2.4 v
8 read cycle timing diagram relative luminous intensity vs. temperature her hdsp-2112/2502 hdsp-2113/2503 yellow hdsp-2111/2501
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 a 3 -a 4 . address inputs each location in memory has a distinct address. address inputs (a 0 -a 2 ) (a 0 -a 4 , pins 3-6, 10) select a specific location in the character ram, the flash ram or a particular row in the udc (user-defined character) ram. a 3 -a 4 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 a 4 a 3 a 2 a 1 a 0 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? care character ram 1 1 1 character address clock select used to select either an internal (cls = 1) or external (cls = 0) clock source. (cls, pin 11) clock input/output outputs the master clock (cls = 1) or inputs a clock (cls = 0) for slave (clk, pin 12) 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 (d 0 -d 7 , used to read from or write to the display. pins 19, 20, 23-28) gnd (supply) (pin 15) analog ground for the led drivers. gnd (logic) (pin 16) digital ground for internal logic. v dd (power) (pin 14) positive power supply input.
10 figure 1. hdsp-210x/-211x/-212x/-250x internal block diagram.
11 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 this ram stores the dot pattern for custom characters. (udc ram) user-defined character this register is used to provide the address to the udc ram when address register the user is writing or reading a custom character. (udc address register) control word register this register allows the user to adjust the display brightness, flash individual characters, blink, self test, or clear the display. 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 figure 2 shows the logic levels needed to access the hdsp-210x/-211x/-250x character ram. during a normal access, the ce = ??and either rd = ??or wr = ?.?however, erroneous data may be written into the character ram if the address lines are unstable when ce = ??regardless of the logic levels of the rd or wr lines. address lines a 0 -a 2 are used to select the location in the charac- ter ram. two types of data can be stored in each character ram location: an ascii code or a udc ram address. data bit d 7 is used to differentiate between the ascii character and a udc ram address. d 7 = 0 enables the ascii decoder and d 7 = 1 enables the udc ram. d 0 -d 6 are used to input ascii data and d 0 -d 3 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 (d 0 -d 3 ) are used to select one of the 16 udc locations. the upper four bits (d 4 -d 7 ) 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.?a 0 -a 2 are used to select the row to be accessed and d 0 -d 4 are used to transmit the row dot data. the upper three bits (d 5 -d 7 ) are ignored. d 0 (least significant bit) corresponds to the right most column of the 5 x 7 matrix and d 4 (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 a 3 -a 4 are ignored. address lines a 0 -a 2 are used to select the location in the flash ram to store the attribute. d 0 is used to store or remove the flash attribute. d 0 = ??stores the attribute and d 0 = ? removes the attribute. when the attribute is enabled through bit 3 of the control word and a ??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. ccccc ooooo lllll 12345 udc hex d 4 d 3 d 2 d 1 d 0 character code 11111 row 1 ***** 1f 10000 row 2 * 10 10000 row 3 * 10 11110 row 4 * * * * 1d 10000 row 5 * 10 10000 row 6 * 10 10000 row 7 * 10 ignored 0 = logic 0; 1 = logic 1; * = illuminated led. figure 4. data to load ""f'' into the udc ram. figure 3. logic levels to access a udc character.
13 figure 5. logic levels to access the flash ram. table 2. current requirements at different brightness levels v dd = 5.0 v % current at 25 c symbol d 2 d 1 d 0 brightness typ. units i dd (v) 0 0 0 100 200 ma 0 0 1 80 160 ma 0 1 0 53 106 ma 011 40 80 ma 100 27 54 ma 101 20 40 ma 110 13 26 ma figure 6. logic levels to access the control word register 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; how- ever, 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 i dd . i dd can be calculated at any bright- ness level by multiplying the percent brightness level by the value of i dd at the 100% bright- ness level. these values of i dd 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?,?the output of the flash ram is checked. if the content of a loca- tion in the flash ram is a ?,?the associated digit will flash at 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 ?,?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 eight digits of the display. when this bit is a ??all eight digits of the display will blink at approxi- mately 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 = ??indicates a passed self test and bit 5 = ? 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 ?.?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 approxi- mately 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 func- tion, 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 ? 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 ?.?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 ??. the udc ram, udc address register, and the re- mainder 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 s 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 space (20h) will be loaded into the character ram to blank the display. the flash ram and control word register are loaded with all ??. 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 verti- cally 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 bright- ness 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 figure 7. logic levels to reset the display.
15 used. prior to use, the hdsp- 210x/-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 (v in < ground) or to a voltage 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 con- nected either to ground or to v dd . voltages should not be applied to the inputs until v dd 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, r j-a are shown in table 3 and include the effects of r j-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 interconnec- tions 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 recom- mended 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 solder- ing, a rosin-based rma flux can be used. the solder wave temper- ature should be set at 245 c 5 c (473 f 9 f), and the dwell in the wave should be set between 1 1 / 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, ja , using various amounts of heatsinking material heatsinking metal w/sockets w/o sockets w/sockets per device w/o filter w/o filter w/filter sq. in. (avg.) (avg.) (avg.) units 0313035 c/w 1312833 c/w 3302633 c/w max. metal 29 25 32 c/w 4 board avg 30 27 33 c/w
color range (nm) color bin min. max. yellow 3 581.5 585.0 4 584.0 587.5 5 586.5 590.0 6 589.0 592.5 7 591.5 595.0 green 1 576.0 580.0 2 573.0 577.0 3 570.0 574.0 4 567.0 571.5 intensity range (mcd) bin min. max. i 5.12 9.01 j 7.68 13.52 k 11.52 20.28 l 17.27 30.42 m 25.39 45.63 note: test conditions as specified in optical characteristic table. color bin limits note: test conditions as specified in optical characteristic table. intensity range (mcd) bin min. max. g 2.50 4.00 h 3.41 6.01 i 5.12 9.01 j 7.68 13.52 k 11.52 20.28 note: test conditions as specified in optical characteristic table. intensity bin limits for hdsp-2107 intensity bin limits for hdsp-211x and hdsp-250x for additional information on soldering and post solder clean- ing, 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 informa- tion on contrast enhancement see application note 1015, contrast enhancement techniques for led displays . www.agilent.com/semiconductors e-mail: semiconductorsupport@agilent.com data subject to change. copyright ? 2004 agilent technologies, inc. obsoletes 5988-2259en july 14, 2004 5988-4668en for product information and a complete list of agilent contacts and distributors, please go to our web site.

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