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1 data sheet AS2590 rev. 1 dec. 1993 lc display driver with 18 digits, 6 symbols and clock/timer austria mikro systeme international v dd keyboard vss dialler controller as2574a/b sda scl v dd x1 x2 v23 v13 v lcd bias ms vss AS2590 32.768khz speech circuit key features q very low operating current, typ. 30 m a @ 3v q low power oscillator using 32.768 khz xtal q 2-wire interface compatible to as2574b q 18 digits by 7 segments q 6 symbols q 24 hour clock showing hours and minutes q timer automatically showing elapsed time in minutes and seconds after each telephone conversation q 33 lcd segment outputs and 4 lcd backplane outputs q 4 times multiplex mode with a cycle time of 128 hz q mode select pin for selecting clock function general description the AS2590 is an integrated cmos device for driving a liquid crystal display intended for use in telephones. the 2-wire serial interface is compatible to the dialler as2574b. the extreme low operating current allows the circuit to be operational also during on-hook which is necessary in order to the use of the clock function. in on-hook condition the circuit can be supplied by a small leakage current from the telephone line or from a small 3v battery. whether the oscillator shall continue operating or be stopped during on-hook is determined by the mode pin, ms. package available in 48 pin dip and 52 pin plcc.
2 data sheet AS2590 rev. 1 dec. 1993 pin description dil plcc symbol function 1 1 bp1 blackplanes 2 2 bp0 3 3 s0 segment outputs 44s1 55s2 66s3 78s4 89s5 910s6 10 11 s7 11 12 s8 12 13 s9 13 14 v1/3 1/3 of v dd pin for external voltage divider 14 15 s10 segment outputs 15 16 s11 16 17 s12 17 18 s13 18 19 s14 19 21 s15 20 22 s16 21 23 s17 22 24 s18 23 25 s19 24 26 v ss negative supply pin 25 27 bp3 back plane outputs 26 28 bp2 27 29 v2/3 2/3 of v dd pin for external voltage divider 28 30 s32 segment outputs 29 31 s31 30 32 s30 31 34 s29 32 35 s28 33 36 s27 34 37 s26 35 38 s25 36 39 s24 37 40 s23 38 41 s22 39 42 s21 40 43 s20 41 44 v lcd negative supply pin for lc display
3 data sheet AS2590 rev. 1 dec. 1993 pin description continued dil plcc symbol function 42 45 sda serial data line input to dialler/controller 43 47 scl clock line input of serial data link 44 48 v bias oscillator bias input, recommended bias resistor 2.2 m w 45 49 xtal1 oscillator pins for 32.768 khz crystal, a resistor and two capacitors 46 50 xtal2 47 51 ms mode select input: ms = v ss ?clock/timer disabled ms = v dd ?clock/timer enabled 48 52 v dd positive supply pin digit description segment abcdefg 0 numbers on on on on on on 1 0? on on 2 onon onon on 3 onononon on 4 onon onon 5ononononon 6 on ononononon 7ononon 8 ononononononon 9 ononon onon a letter a on on on on b letter b on on on on on c letter c on on on d letter d on on on on on _ underscore on * asterisk on on on on # hash on on on on on - pause on p/t temp. mf on on on r recall on on lcd layout a g d b c f e figure 2 d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10 d 11 d 12 d 13 d 14 d 15 d 16 d 17 sb3 sb5 sb4 sb2 sb0 sb1 figure 1 table 1 segments digits sb0 = loudspeaker on (blinking with 1 hz) sb1 = microphone muted (blinking with 1 hz) sb2 = 2nd key function enabled sb3 = number stored sb4 = number buffered in fifo, not stored sb5 = colon for clock and timer (blinking when clock is shown)
4 data sheet AS2590 rev. 1 dec. 1993 description operating modes the following two operating modes are pin selectable: mode 0: clock and timer are disabled and the oscillator is stopped when going on-hook (command blank all). mode 1: clock and timer functions are enabled, clock is displayed both during off- and on-hook (assuming that clock is set). when going from off-hook to on-hook, the timer content (elepsed time) is displayed for 6 seconds (assuming that a start timer command was received). clock after a power up reset the clock is disabled. the clock will not be displayed until a valid set clock procedure has been performed (mode 1 only). the format of the clock is hh:mm and the leading zero of the hours is suppressed and symbol 5 (:) is blinking with a frequency of 1 hz. the timer is running when off-hook and displayed for 6 seconds when going on-hook. the content of the timer (elapsed time) is shown in stead of the clock in the format mm:ss. if a set clock command is received the display is blanked, four underscore symbols are displayed where the 4 digits of the clock will be entered (the 4 most right digits) and symbol 5 is turned on (_ _ : _ _). the next 4 data words are interpreted as the time (hh mm). the fourth digit terminates the set clock and starts the clock with the seconds set to zero. if less than 4 data words (digits) are received the first command (normally a blank digits or a blank all) will terminate the set clock. but as the procedure was incomplete, it is regarded as invalid and further clock display is disabled. the next valid set clock command will enable the clock again. the set clock command does not effect the timer. the time-out condition (approx. 15 seconds) when setting clock is recognized by the dialler/controller (e.g. as2574). if a time-out condition occours the dialler sends a blank all command to terminated the set clock. timer the following commands effect the timer: - start timer and start fifo; they start the timer. if the timer is already running, it cannot be restarted by one of these commands before stopping the timer with the blank all command. - power up; enables subsequent start timer commands. - blank all; clears the whole display (including special symbols) and displays the timer contents for 6 seconds (if clock/timer function is enabled) or until a new start timer/fifo command is received. then it returns to normal display mode. - if any command or data is received by the serial interface within the time out period after a blank all command, the timer display will be blanked or replaced by the clock display. the timer is displayed in the format mm:ss with the leading zero of the minutes suppressed and symbol 5 (:) turned on. lcd outputs the 33 segment outputs and 4 backplane outputs can drive a customized liquid crystal display in 1:4 multiplex mode. two reference voltages v1/3 and v2/3 are provided by an external voltage divider. digits and special symbols the display consists of 18 seven segment digits and 6 special symbols (see figure 1): - d0?17; d0 is the most left seven segment digit, the possible numbers displayed by one digit are shown in figure 2. the symbol (_) is only displayed at d13, d14, d16 and d17 when setting the clock. - sb0?b5; 6 special symbols (one segment for each symbol only), see figure 1 for reference. if sb0 (loudspeaker on) or sb1 (microphone muted) are turned on, they blink with a frequency of 1 hz. multiplex mode a total of 132 segments are addressable. one output drives 4 segments in a time multiplex mode. the 4 backplane outputs determine the currently addressed segment (see figure 3). figure 3 gives the correlation between segment outputs and addressed segments. data and commands 32 different words may be received via the serial interface. 19 words are interpreted as display data for one of the 18 seven segment digits. table 2 gives the translation from received code to displayed symbol. 13 words are valid commands codes. the function of each command is described in table 2, and table 4 lists the 5 bit codes for all possible commands.
5 data sheet AS2590 rev. 1 dec. 1993 table 2 command summary no mnemonic function 1 set ls turns on special symbol sb0 (loudspeaker on, blinking) 2 clear ls turns off special symbol sb0 3 set mute turns on special symbol sb1 (microphone muted, blinking) 4 clear mute turns off special symbol sb1 5 set 2nd turns on special symbol sb2 (2nd function on keyboard) 6 clear 2nd turns off special symbol sb2 7 set clock initiates clock setting; sb5 is turned on 8 start blanks all digits, sb3 and sb4; accepts data, timer not started 9 start copy blanks all digits and sb4; turns on sb3, accepts data, timer not started (if not already running) 10 start fifo blanks all digits and sb3; turns on sb4, accepts data, timer started (if not already running) 11 start timer blanks all digits, turns off sb3 and sb4, accepts data, timer started (if not already running) 12 blank all blanks all digits and all special symbols (except d13, d14, d16, d17 and sb5 when clock is running) 13 test mode turns circuit into test mode table 3 segment mapping segment backplane output bp0 bp1 bp2 bp3 s0 sb0 sb1 sb4 sb2 s1 d0/f d0/g d0/e d0/d s2 d0/a d0/b d0/c d1/d s3 d1/f d1/g d1/e d1/c s4 d1/a d1/b d2/g d2/e s5 d2/a d2/f d2/b d2/c s6 d3/a d3/f d2/e d2/d s7 d3/b d3/g d3/c d3/d s8 d4/f d4/g d4/e d4/d s9 d4/a d4/b d4/c d5/d s10 d5/f d5/g d5/e d5/c s11 d5/a d5/b d6/g d6/e s12 d6/a d6/f d6/b d6/c s13 d7/a d7/f d7/e d6/d s14 d7/b d7/g d7/c d7/d s15 d8/f d8/g d8/e d8/d s16 d8/a d8/b d8/c d9/d segment backplane output bp0 bp1 bp2 bp3 s17 d9/f d9/g d9/e d9/c s18 d9/a d9/b d10/g d10/e s19 d10/a d10/f d10/b d10/c s20 d11/a d11/f d11/e d10/d s21 d11/b d11/g d11/c d11/d s22 d12/f d12/g d12/e d12/d s23 d12/a d12/b d12/c d13/d s24 d13/f d13/g d13/e d13/c s25 d13/a d13/b d14/g d14/e s26 d14/a d14/f d14/b d14/c s27 d15/a d15/f d15/e d14/d s28 d15/b d15/g sb5 d15/d s29 d16/f d16/g d16/e d16/d s30 d16/a d16/b d16/c d17/d s31 d17/f d17/g d17/e d17/c s32 d17/a d17/b d15/c sb3 dn/m = segment m of digit n sbn = special symbol n
6 data sheet AS2590 rev. 1 dec. 1993 bp0 bp1 bp2 bp3 s0 s1 v dd v 2/3 v 1/3 vss v dd v 2/3 v 1/3 vss v dd v 2/3 v 1/3 vss v dd v 2/3 v 1/3 vss v dd v 2/3 v 1/3 vss v dd v 2/3 v 1/3 vss active backplane bp0 bp1 bp2 bp3 on off off off off on on on to high transition of the data line while the clock line is high followed by a negative clock pulse indicates a stop condition (see figure 4). sda scl start #1 lsb b0 b1 b2 b3 msb b4 stop #1 word gap start #2 figure 4 interface timing serial interface the serial interface is a one way, two line link between the dialler (as2574) and the display driver. the two lines are the serial data line (sda) and the serial clock line (scl). the display driver can only receive data. word transfer: data are transferred as 5 bit words with start and stop bit. the least significant bit is sent first after the start bit. as long as there is no data transfer, both data and clock lines have to remain high. also between two words both lines have to stay high for a specified time. figure 4 shows the timing of the serial interface. start and stop conditions: a start condition is detected when the data line goes from high to low while the clock line is held high. a low figure 3 lcd driver outputs table 4 codes for serial interface no symbol msb b3 b2 b1 lsb hex 1 sb0-on 0010105 2 sb0-off 0001103 3 sb1-on 1000111 4 sb1-off 0100109 5 sb2-on 0011107 6 sb2-off 111111f 7 set clock 010110b 8 start 011010d 9 copy 011110f 10 fifo 1001113 11 timer 1010115 12 blank 111011d 13 test 1011117 14 0 111001c 15 1 0000000 16 2 0010004 17 3 0001002 18 4 1000010 19 5 1010014 20 6 1001012 21 7 0100008 22 8 011000c 23 9 010100a 24 a 0011006 25 b 1011016 26 c 011100e 27 d 111101e 28 * 1100018 29 # 110101a 30 110111b 31p/t 1100119 32 r 0000101
7 data sheet AS2590 rev. 1 dec. 1993 electrical characteristics absolute maximum ratings positive supply voltage ........................................................................................................ ...........-0.3v v dd 7v input current .................................................................................................................. .............................. 25 ma digital input voltage .....................................................................................................v ss - 0.3v v in v dd + 0.3v electrostatic discharge (hbm) .................................................................................................. ...................... 500v storage temperature ............................................................................................................ ..........-65 c to +125 c recommended operating conditions supply voltage ................................................................................................................. .............2.5v v dd 5.5v oscillator frequency ........................................................................................................... ....................32.768 khz operating temperature .......................................................................................................... ..........- 25 c to +70 c dc characteristics (default conditions: recommended operating conditions; outputs unloaded; v dd = 3.0v) symbol parameter conditions min typ max units test circuit fig. 5 i dd0 standby current no clock running 1.5 m a i dd operating current t amb = 5 to 55 c3050 m a note 1, note 2 v il input voltage, low v ss 0.2 v dd v v ih line voltage, high 0.8 v dd v dd v v lcd output voltage, sink i lcd = 4.8 ma 0.4 v r bias oscillator bias resistor 2.2 m w note 1: segment and backplane outputs loaded with maximum 30 pf, power consumption of external voltage divider not included, r bias = 2.2 m w 10%. note 2: xtal parameters: rimax = 60 k w (rityp = 30 k w ) qmin = 35 000 co = 1.5 pf (capacitance across xtal terminals) fxtal = 32.768 khz
8 data sheet AS2590 rev. 1 dec. 1993 sda/scl serial interface fig. 5 f cl clock frequency 10 khz f clh clock high time 50 m s f cll clock low time 50 m s f cd clock low to data change 20 t cll ns f soh stop bit high time 50 m s f sol stop bit low time 50 m s f hd data hold time 200 ns f suso clock setup for stop 200 ns f hsa clock hold for start 200 ns f gap data high between 2 words 100 m s bp0? back plane outputs figure 6, note 1 t bron rise time, on 20 m s t bfon fall time, on 20 m s t brof rise time, off 20 m s t bfof fall time, off 20 m s t bc cycle frequency 128 hz s0?2 segment outputs figure 7, note 2 t sron rise time, on 20 m s t sfon fall time, on 20 m s t srof rise time, off 20 m s t sfof fall time, off 20 m s t sc cycle frequency 128 hz t timer timer display time note 3 5 6 sec t xup oscillator startup time r bias = 2.2 m w 300 ms ac characteristics (v dd = 3.0v; t amb = -25 to 70 c, unless otherwise specified) symbol parameter conditions min typ max units note 1: loads on backplanes = 3 000 pf//10 m w note 2: loads on segments = 360 pf//1 m w note 3: after blank all command and timer has been started with a valid start command, timer content is displayed.
9 data sheet AS2590 rev. 1 dec. 1993 sda scl t hd t clh t cll t cd t hsa start bit 0 bit 1 sda scl bit 4 stop word gap t cll t suso t soh t sol t gap figure 5 serial interface timing waveforms timing diagrammes
10 data sheet AS2590 rev. 1 dec. 1993 output waveforms v dd 0.9 v dd 0.1 v dd vss t bron t bc t bfon t bc t brof t brof v dd 0.9 v dd 0.1 v dd vss t sc t sfon t sron t sc t sfof t sfof figure 6 backplane timing waveforms figure 7 segment timing waveforms
11 data sheet AS2590 rev. 1 dec. 1993 pin configurations 48 pin dip 148 14 AS2590 v dd ms xtal2 xtal1 v bias scl sda v lcd s20 s8 s21 s22 s23 s24 bp1 bp0 s0 s1 s2 s3 s4 s7 s5 s6 s9 v1/3 s10 s25 s11 s12 s13 s14 s15 s16 s17 s18 s19 vss s26 s27 s28 s29 s30 s31 s32 v2/3 bp2 bp3 2 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 52 pin plcc ordering information: 48 pin dip: AS2590 p 52 pin plcc: AS2590 n applications: for application support contact your local ams sales offices. AS2590 nc s3 s2 s1 s0 bp0 bp1 v dd ms xtal2 xtal1 v bias scl nc sda v lcd s20 s21 s22 s23 s24 s25 s26 s27 s28 s29 s4 s5 s6 s7 s8 s9 v1/3 s10 s11 s12 s13 s14 nc s15 s16 s17 s18 s19 v ss bp3 bp2 v2/3 s32 s31 s30 nc 1 14 27 40
12 data sheet AS2590 rev. 1 dec. 1993 sales representative devices sold by austria mikro systeme are covered by the warranty and patent indemnification provisions appearing in its term o f sale. austria mikro systeme makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from pa tent infringement. austria mikro systeme reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it is neces sary to check with austria mikro systeme for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austria mikro systeme for each application. copyright 1993, austria mikro systeme international ag, schloss premst?tten, 8141 unterpremst?tten, austria. trademarks registered . all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished here by austria mikro systeme is believed to be correct and accurate. however, austria mikro systeme 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 indire ct, 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 recipient or any third party shall arise or flow out of austria mikro systeme rendering of technical or other services.

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