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as1100 serially interfaced, 8-digit led driver data sheet www.austriamicrosystems.com revision 1.33 1 - 17 1 general description the as1100 is an led driver for 7 segment numeric displays of up to 8 digits. the as1100 can be programmed via a conventional 4 wire serial interface. the device includes a bcd code-b decoder, a multiplex scan circuitry, segment and display drivers, and a 64 bit memory. the memory is used to store the led settings, so that continuous reprogramming is not necessary. every individual segment can be addressed and updated separately. only one external resistor is required to set the current through the led display. brightness can be controlled either in an analog or digital way. the user can choose the internal code-b decoder to display numeric digits or to address each segment directly. the as1100 features an extremely low shutdown current of only 20a and an operational current of less than 500a. the number of visible digits can be programmed as well. the as1100 can be reset by software and an external clock can be used. several test modes support easy debugging. the as1100 is offered in a 24-pin dip and soic packages. 2 key features 10mhz serial interface individual led segment control decode/no-decode digit selection 20a low-power shutdown (data retained) extremely low operating current 0.5ma in open loop digital and analog brightness control display blanked on power-up drive common-cathode led display software reset optional external clock 24-pin dip and soic packages 3 applications the as1100 is an ideal solution for bar-graph displays, industrial controllers, panel meters, led matrix displays and white goods such as washing machines and dishwasher. figure 1. typical application diagram ? single cell to 3.3v synchronous boost converter 8 digits 8 segments gnd gnd clk load din iset v dd difg0-dig3 seg a-g sep dp mosi p i/o sck +5v 8-digit p display 9.53k 19 18 1 12 1 9 4
www.austriamicrosystems.com revision 1.33 2 - 17 as1100 data sheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) pin descriptions table 1. pin descriptions pin name pin number description din 1 data input. data is programmed into the 16bit shift register on the rising clk edge dig 0 ? dig 7 2, 3, 5?8, 10, 11 8 digit driver lines that sink the cu rrent from the common cathode of the display. in shutdown mode the as1100 switches the outputs to v dd . gnd 4, 9 both gnd pins must be connected. load/cs 12 strobe input. with the rising edge of the load signal the 16 bit of serial data is latched into the register. clk 13 clock input. the interface is capable to support clock frequencies up to 10mhz. the serial data is clocked into the internal shift register with the rising edge of the clk signal. on the dout pin the data is applied with the falling edge of clk. seg a?g, dp 14?17, 20?23 seven segment driver lines including the decimal point. when a segment is turned off the output is connected to gnd. iset 18 the current into iset determines the peak current through the segments and therefore the brightness. v dd 19 positive supply voltage (+5v) dout 24 serial data output for cascading drivers. the output is valid after 16.5 clock cycles. the output is never set to high impedance. dip/so 11 12 13 14 15 16 17 18 19 20 21 22 23 dig4 as1100 10 1 2 3 4 5 6 7 8 9 24 dout din dig0 gnd dig6 dig2 gnd dig3 load seg d seg dp seg e seg c v dd i set seg g seg b seg f seg a top clk dig7 dig5 dig1
www.austriamicrosystems.com revision 1.33 3 - 17 as1100 data sheet - absolute maximum ratings 5 absolute maximum ratings table 2. absolute maximum ratings parameter min max units notes v dd to gnd -0.3 +6 v din, clk, load to gnd -0.3 +6 v all other pins to gnd -0.3 v dd + 0.3 v v out -0.3 7 v electro static discharge at digital outputs +500 v electro static discharge at all other pins +1000 v current dig0?dig7 sink current 500 ma sega?g, dp source current 100 ma latch up immunity 200 ma continuous power dissipation (ta = +85c) narrow plastic dip 1066 mw derate 13.3mw/c above +70c wide so 941 mw derate 11.8mw/c above +70c operating temperature ranges (t min to t max ) as1100xl 0 +70 oc as1100xe -40 +85 oc storage temperature range -65 +150 oc package body temperature +260 oc the reflow peak soldering temperature (body temperature) specified is in accordance with ipc/jedec j-std- 020c ?moisture/reflow sensitivity classification for non-hermetic solid state surface mount devices?. the lead finish for pb-free leaded packages is matte tin (100% sn).
www.austriamicrosystems.com revision 1.33 4 - 17 as1100 data sheet - electrical characteristics 6 electrical characteristics v dd = 5v, r set = 9.53k 1%, t a = t min to t max , unlesss otherwise noted. table 3. electrical characteristics symbol parameter conditions min typ max units v dd operating supply voltage 4.0 5.0 5.5 v i ddsd shutdown supply current all digital inputs at v dd or gnd, ta = +25oc 20 50 a i dd operating supply current r set = open circuit 500 a all segments and decimal point on, i seg = -40ma 330 ma f osc display scan rate 8 digits scanned 500 800 1300 hz i digit digit drive sink current v out = 0.65v 320 ma i seg segment drive source current t a = +25oc, v out = (v dd -1v) -30 -40 -45 ma i seg segment drive current matching 3.0 % i digit digit drive source current digit off, v digit = (v dd -0.3v) -2 ma i seg segment drive sink current segment off, v seg = 0.3v 5 ma logic inputs i ih , i il input current din, clk, load v in = 0v or v dd -1 1 a v ih logic high input voltage 3.5 v v il logic low input voltage 0.8 v v oh output high voltage dout, i source = -1ma v dd - 1 v v ol output low voltage dout, i sink = 1.6ma 0.4 v hysteresis voltage din, clk, load 1 v timing characteristics t cp clk clock period 100 ns t ch clk pulse width high 50 ns t cl clk pulse width low 50 ns t csh clk rise to load rise hold time 0ns t ds din setup time 25 ns t dh din hold time 0 ns t do output data propagation delay c load = 50pf 25 ns t ldck load rising edge to next clock rising edge 50 ns t csw minimum load pulse high 50 ns t dspd data-to-segment delay 2.25 ms
www.austriamicrosystems.com revision 1.33 5 - 17 as1100 data sheet - typical operating characteristics 7 typical operating characteristics figure 3. segment driver capability , figure 4. segment current versa r set v dd = 5v, logic level = high 0 5 10 15 20 25 30 35 40 45 50 00.511.522.533.544.5 voltage below vdd at output (v) segment current (ma) . 0 5 10 15 20 25 30 35 40 45 50 10 100 rset (kohm) isegment (ma) .
www.austriamicrosystems.com revision 1.33 6 - 17 as1100 data sheet - detailed description 8 detailed description serial-addressing modes programming of the as1100 is done via 4 wire serial interfac e. a programming sequence cons ists of 16-bit packages. the data is shifted into the internal 16 bit register with t he rising edge of the clk signal. with the rising edge of the load signal the data is latched into a digital or control r egister depending on the address. the load signal must go to high after the 16th rising clock edge. the load signal can also come later but just before the next rising edge of clk, otherwise data would be los t. the content of the internal shift register is applied 16.5 clock cycl es later to the dout pin. the data is clocked out at the falling edge of clk. the bits of the 16bit-programming package are described in ta b l e 4 . the first 4 bits d15-d12 are don?t care, d11-d8 contain the address and d7-d0 contain the data. the first bit is d15, the most significant bit (msb). the exact timing is given in figure 5 . figure 5. timing diagram table 4. serial data format (16bits) digit and control registers the as1100 incorporates 15 registers, which are listed in ta b l e 5 . the digit and control registers are selected via the 4bit address word. the 8 digit registers are realized with a 64bit memory. each digit can be controlled directly without rewriting the whole contents. the contro l registers consist of decode mode, disp lay intensity, number of scanned digits, shutdown, display test, and re set/external clock register. shutdown mode the as1100 features a shutdown mode, where it consumes only 20a current. the shutdown mode is entered via a write to register 0ch. then all segmen t current sources are pulled to ground a nd all digit drivers are connected to v dd , so that nothing is displayed. all internal digit register s keep the programmed values. th e shutdown mode can either be used for power saving or for generating a flashing display by repeatedly entering and leaving the shutdown mode. the as1100 needs typically 250s to exit the shutdown mode. during shutdown the as1100 is fully programmable. only the display test function overrides the shutdown mode. d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 x x x x address msb data lsb d0 d1 d15 d14 dout din clk load t csw t cl t ch t cp t cs t ldck t do t ds t dh
www.austriamicrosystems.com revision 1.33 7 - 17 as1100 data sheet - detailed description initial power-up after powering up the system all register are reset, so that the display is blan k. the as1100 starts the shutdown mode. all registers should be programmed for normal operation. the default settings enable only scan of one digit, the internal decoder is disabled, data register and intensity register are set to the minimum value. decode-mode register in the as1100 a bcd decoder is included. every digit can be selected via register 09h to be decoded. the bcd code consists of the numbers 0-9, e,h, l,p and -. in register 09h a logic high enables the decoder for the appropriate digit. in case that the decoder is bypassed (logic low) the data bits d7-d0 correspond to the segment lines of the as1100. in ta b l e 7 some possible settings for register 09h are shown. bit d7, which corresponds to the decimal point, is not affected by the settings of the decoder. logic high means that the decimal point is displayed. in ta b l e 8 the font of the code b decoder is shown. in table 9 the correspondence of the register to t he appropriate segments of a 7 segment display is shown (see figure 6) . intensity control and interdigit blanking brightness of the display can be controlled in an analog way by changing the external resistor (r set ). the current, which flows between v dd and iset, defines the current that flows thro ugh the leds. the led current is 100 times the iset current. the minimum value of r set should be 9.53k , which corresponds to 40ma segment current. the brightness of the display can also be controlled digitally vi a register 0ah. the brightne ss can be programmed in 16 steps and is shown in table 10 . an internal pulse width modulator controls the intensity of the display. scan-limit register the scan limit register 0bh selects the number of digits displa yed. when all 8 digits are displayed the update frequency is typically 800hz. if the number of di gits displayed is reduced, the update frequency is reduced as well. the frequency can be calculated using 8fosc/n, where n is the number of digits. since the numb er of displayed digits influences the brightness, the resistor r set should be adjusted accordingly. the table 12 shows the maximum allowed current, when fewer than 4 digits are used. to avoid differences in brightness the scan limit register should not be used to blank portions of the display (leading zeros). table 5. register address map register address hex code d15-d12 d11 d10 d9 d8 no-op x0000 0xx0 digit 0 x0001 0xx1 digit 1 x0010 0xx2 digit 2 x0011 0xx3 digit 3 x0100 0xx4 digit 4 x0101 0xx5 digit 5 x0110 0xx6 digit 6 x0111 0xx7 digit 7 x1000 0xx8 decode mode x 1001 0xx9 intensity x1010 0xxa scan limitx1011 0xxb shutdownx1100 0xxc not used x1101 0xxd reset and ext. clockx1110 0xxe display testx1111 0xxf
www.austriamicrosystems.com revision 1.33 8 - 17 as1100 data sheet - detailed description note: the decimal point is set by bit d7 = 1 table 6. shutdown register format (address (hex) = 0xxc mode address code (hex) register data d7 d6 d5 d4 d3 d2 d1 d0 shutdown mode 0xxc x x x x x x x 0 normal operation 0xxc xxxxxxx1 table 7. decode-mode register examples (address (hex) = 0xx9 decode mode register data hex code d7 d6 d5 d4 d3 d2 d1 d0 no decode for digits 7?000000000 0x00 code b decode for digit 0 no decode for digits 7?1 00000001 0x01 code b decode for digits 3?0 no decode for digits 7? 4 00001111 0x0f code b decode for digits 7?011111111 0xff table 8. code b font 7-segment character register data on segments = 1 d7* d6-d4 d3 d2 d1 d0 dp* a b c d e f g 0 x 0000 1111110 1 x 0001 0110000 2 x 0010 1101101 3 x 0011 1111001 4 x 0100 0110011 5 x 0101 1011011 6 x 0110 1011111 7 x 0111 1110000 8 x 1000 1111111 9 x 1001 1111011 -- x 1010 0000001 e x 1011 1001111 h x 1100 0110111 l x 1101 0001110 p x 1110 1100111 blank x 1111 0000000 table 9. no-decode mode data bits and corresponding segment lines register data d7 d6 d5 d4 d3 d2 d1 d0 corresponding segment line dp a b c d e f g
www.austriamicrosystems.com revision 1.33 9 - 17 as1100 data sheet - detailed description figure 6. standard 7-segment led table 10. intensity register format (address (hex) = 0xxa) duty cycle d7 d6 d5 d4 d3 d2 d1 d0 hex code 1/32 (min on) xxxx 0000 0xx0 3/32 xxxx 0001 0xx1 5/32 xxxx 0010 0xx2 7/32 xxxx 0011 0xx3 9/32 xxxx 0100 0xx4 11/32 xxxx 0101 0xx5 13/32 xxxx 0110 0xx6 15/32 xxxx 0111 0xx7 17/32 xxxx 1000 0xx8 19/32 xxxx 1001 0xx9 21/32 xxxx 1010 0xxa 23/32 xxxx 1011 0xxb 25/32 xxxx 1100 0xxc 27/32 xxxx 1101 0xxd 29/32 xxxx 1110 0xxe 31/32 (max on) xxxx 1111 0xxf table 11. scan -limit register format (address (hex) = 0xxb) decode mode register data hex code d7 d6 d5 d4 d3 d2 d1 d0 display digit 0 only xxxxx0 0 0 0xx0 display digit 0 & 1 xxxxx0 0 1 0xx1 display digit 0 1 2 xxxxx0 1 0 0xx2 display digit 0 1 2 3 xxxxx0 1 1 0xx3 display digit 0 1 2 3 4 xxxxx1 0 0 0xx4 display digit 0 1 2 3 4 5 xxxxx1 0 1 0xx5 display digit 0 1 2 3 4 5 6xxxxx1 1 0 0xx6 display digit 0 1 2 3 4 5 6 7xxxxx1 1 1 0xx7 a b c d e f g dp
www.austriamicrosystems.co m revision 1.33 10 - 17 as1100 data sheet - detailed description display test register with the display test register 0fh all led can be tested. in the test mode all leds are switched on at maximum brightness (duty cycle 31/32). all programming of digit and co ntrol registers are maintained. the format of the register is given in table 13 . note: the as1100 remains in display-test mode until the displa y-test register is reconfi gured for normal operation. no-op register (c ascading of as1100) the no-operation register 00h is used when as1100s are casc aded in order to support more than 8 digit displays. the cascading must be done in a way that all dout are connected to dinof the following as1100. the load and clk signals are connected to all devices. for a write operation for example to the fifth device the command must be followed by four no-operation commands. when the load signal finally goes to hi gh all shift registers are latched. the first four devices have got no-operation commands and only the fifth device sees the intended command and updates its register. reset and externa l clock register this register is addressed via the serial interface. it allows to switch the devic e to external clock mode (if d0=1 the clk pin of the serial interface operates as system clock inpu t.) and to apply an external reset (d1). this brings all registers (except reg. e) to default state. for stand ard operation the register contents should be "00h". table 12. maximum segment current for 1-, 2-, or 3-digit displays number of digits displayed maximum segment current (ma) 110 220 330 table 13. display-test register format (address (hex) = 0xxf) mode register data d7 d6 d5 d4 d3 d2 d1 d0 normal operation xxxxxxx0 display test mode xxxxxxx1 table 14. reset and external clock register (address (hex) = oxxe) mode address register data code (hex) d7 d6 d5 d4 d3 d2 d1 d0 normal operation, internal clock 0xxe xxxxxx0 0 normal operation, external clock 0xxe xxxxxx0 1 reset state, internal clock 0xxe xxxxxx1 0 reset state, external clock 0xxe xxxxxx1 1
www.austriamicrosystems.co m revision 1.33 11 - 17 as1100 data sheet - application information 9 application information supply bypassing and wiring in order to achieve optimal performance the as1100 shall be pl aced very close to the led display to minimize effects of electromagnetic interference and wirin g inductance. furthermore, it is recommended to connect a 10f electrolytic and a 0.1f ceramic capacitor between v dd and gnd to avoid power supply ripple. also, both gnds must be connected to ground. selecting r set resistor and using external drivers the current through the segments is c ontrolled via the external resistor r set . segment current is about 100 times the current in iset. the right values for iset are given in table 15 . the maximum current the as1100 can drive is 40ma. if higher currents are needed, external driv ers must be used. in that case it is no longer necessary that the as1100 drives high currents. a recommended value for r set is 47k . in cases that the as1100 only drives few digits, table 12 specifies the maximum currents and r set must be set accordingly. refer to absolute maximum ratings to calculate acceptable limits for ambient temperature, se gment current, and the led forward-voltage drop. 8x8 led dot matrix driver the example in figure 7 uses the as1100 to drive an 8x8 led dot matrix. the led columns have common cathode and are connected to the dig0-7 outputs. the rows are connected to the segment drivers. each of the 64 leds can be addressed separately. the columns are selected via the digits as shown in ta b l e 5 . the decode mode register (0xx9) has to be programmed to ?00000000? as stated in table 4. the single leds in a column can be addressed as stated in ta b l e 9 , where d0 corresponds to segment g and d/ to segment dp. for a multiple digit dot matrix several as1100 have to be cascaded. table 15. r set vs segment current and led forward voltage i seg (ma) v led (v) 1.5 2.0 2.5 3.0 3.5 40 12.2k 11.8k 11.0k 10.6k 9.69k 30 17.8k 17.1k 15.8k 15.0k 14.0k 20 29.8k 28.0k 25.9k 24.5k 22.6k 10 66.7k 63.7k 59.3k 55.4k 51.2k
www.austriamicrosystems.co m revision 1.33 12 - 17 as1100 data sheet - application information figure 7. application example as led dot matrix driver cascading drivers the as1100 can be cascaded as well. the dout pin must be connected to the din pin of the following as1100. table 16. package thermal resistance data package thermal resistance ( ja ) 24 narrow dip +75oc/w 24 wide so +85oc/w maximum junction temperature (t j ) = +150oc maximum ambient temperature (t a ) = +85oc seg g seg f seg e seg d seg c seg b seg a seg dp dig 0 dig 7 1 12 1 9 24 19 18 9.53k 4 seg a-g sep dp dip loa clk gnd gnd vdd iset seg g seg f seg e seg d seg c seg b seg a seg dp dig 0 dig 7 1 12 1 9 24 19 18 9.53k 4 seg a-g sep dp dip loa clk gnd gnd vdd iset p
www.austriamicrosystems.co m revision 1.33 13 - 17 as1100 data sheet - application information computing power dissipation the upper limit for power dissipation (pd) for th e as1100 is determined from the following equation: pd = (v dd x 0.5ma) + (v dd - v led )(duty x i seg x n) (eq 1) where: v dd = supply voltage duty = duty cycle set by intensity register n = number of segments driven (worst case is 8) v led = led forward voltage i seg = segment current set by r set dissipation example: i seg = 40ma, n = 8, duty = 31/32, vled = 1.8v at 40ma, v dd = 5.25v pd = 5.25v(0.5ma) + (5.25v - 1.8v)(31/32 x 40ma x 8) = 1.07w thus, for a pdip package ja = +75c/w (from table 13), the maximum allowed ambient temperature t a is given by: t j,max = t a + pd x ja = 150c = t a +1.07w x 75c/w. where: t a = +69.7c. the t a limit for so packages in the dissipation example above is +59.0c.
www.austriamicrosystems.co m revision 1.33 14 - 17 as1100 data sheet - pack age drawings and markings 10 package drawings and markings the device is available in a soic-24 package and pdip-24 package . figure 8. soic-24 package diagram table 17. soic-24 package dimensions symbol min max symbol min max a 2.44 2.64 h 10.11 10.51 a1 0.10 0.30 h 0.31 0.71 a2 2.24 2.44 j 0.53 0.73 b 0.36 0.46 k 7 bsc c 0.23 0.32 l 0.51 1.01 d 15.20 15.40 r 0.63 0.89 e 7.40 7.60 zd 0.66 ref e 1.27 bsc 0 8
www.austriamicrosystems.co m revision 1.33 15 - 17 as1100 data sheet - pack age drawings and markings figure 9. pdip-24 package diagram table 18. pdip-24 package dimensions symbol min typ max symbol min max a4.32 e 1 6.35 6.60 6.86 a 1 0.380 e 1 2.54 bsc b 0.38 0.46 0.56 e a 7.62 bsc b 1 1.40 1.52 1.65 l 3.18 3.43 b 1 1.14 1.27 1.40 0 15 c 0.20 0.25 0.30 n 24 d 31.62 31.75 31.88 q 1 1.40 1.52 1.65 e 7.62 8.26 q 2 3.30 s 1.78 1.91 2.03
www.austriamicrosystems.co m revision 1.33 16 - 17 as1100 data sheet - ordering information 11 ordering information table 19. ordering information part temp range package delivery form as1100pl 0oc to +70oc plastic dip 24-pin tubes as1100wl 0oc to +70oc soic 24-pin tubes as1100pe -40oc to +85oc plastic dip 24-pin tubes as1100we -40oc to +85oc soic 24-pin tubes as1100wl-t 0oc to +70oc soic 24-pin tape & reel as1100we-t -40oc to +85oc soic 24-pin tape & reel
www.austriamicrosystems.co m revision 1.33 17 - 17 as1100 data sheet copyrights copyright ? 1997-200 7, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the mate rial herein may not be reproduced, adapted, merged, translated, stored, or used wit hout the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by austriamicrosystems ag are covered by t he warranty and patent indemni fication provisions appearing in its term of sale. austriamicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freed om of the described devices from patent infringement. austriamicrosystems ag reserves the right to change spec ifications and prices at an y time and without notice. therefore, prior to designing this pro duct into a system, it is necessary to check with austriam icrosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unus ual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems ag for each application. for shipments of less than 100 parts the m anufacturing flow might show deviations from the standard production flow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to reci pient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag a-8141 schloss premstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors a nd representatives, please visit: http://www.austriamicrosystems.com/contact

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