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HT6750 date printer block diagram rev. 1.00 1 may 13, 2002 features operating voltage: 2.4v~5.5v operating current: < 3 a at 3.0v constant voltage output (1.8v 5%) at 2.4v~5.5v operating for driving lamp (1.8v/40ma) lcd contrast can not distort at 2.4v~5.5v operating lcd display drive 1/3 duty, 1/2 bias, frame frequency is 42.67hz at power interrupt, data hold up > 1.0s (between v dd and v ss connect a 0.1 f capacitor) built-in power on reset function 32k crystal oscillator (internal capacitor and resistor) calendar and time adjustment date imprinting modes (y/m/d, d/h/min, imprint off, m/d/y, d/m/y) mode is selected by cyclically turning 4 film printing times is selectable or external input control (30ms/45ms/60ms/external control) direct resetting system lamp output time control provides module test circuit general description the 6-digital timer is a camera data optical printer. dis - playing and printing of data (year month day/day hour: minute/off/month day year/day month year) can be selected by mode selection. date updating is a fully au - tomatic calendar from the year 1998.1.1 to 2049.12.31.

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pad assignment chip size: 2680 2460 ( m) 2 chip thickness=12 mil * the ic substrate should be connected to vss in the pcb layout artwork. pad coordinates unit: m pad no. x y pad no. x y 1 1013.00 1050.62 26 1095.85 872.23 2 1155.00 952.47 27 1095.85 704.23 3 1112.45 781.27 28 1095.85 537.23 4 1112.45 612.27 29 1128.15 388.93 5 1112.45 429.37 30 1113.75 167.03 6 1112.45 260.37 31 1094.35 63.52 7 1112.45 77.47 32 1094.35 241.52 8 1112.45 91.53 33 1094.35 431.52 9 1112.45 274.43 34 1094.35 589.52 10 1112.45 443.43 35 1124.55 798.97 11 1112.45 626.33 36 1124.55 903.97 12 1112.45 795.33 37 1124.55 1008.97 13 1112.45 978.23 38 1019.55 1008.97 14 820.15 1019.43 39 914.55 1008.97 15 674.15 1019.43 40 809.55 1008.97 16 526.15 1019.43 41 704.55 1008.97 HT6750 rev. 1.00 2 may 13, 2002 1 * " , 0 1 * , " 0 1 * " , 0 " " 1 " * " , " " " 0 " " 1 " * " " , 0 2 + 3 / / / / " / 0 / / 1 / * / , / / / / / " / 0 / ! " ! ! ! ! ! " " ' 4 # ! 0 !
pad no. x y pad no. x y 17 380.15 1019.43 42 599.55 1008.97 18 232.15 1019.43 43 494.55 1008.97 19 86.15 1019.43 44 389.55 1008.97 20 61.85 1019.43 45 221.85 1016.97 21 216.85 1018.93 46 74.45 1016.97 22 371.85 1018.93 47 71.25 1016.97 23 526.85 1018.93 48 226.25 1016.97 24 681.85 1018.93 49 487.89 1001.22 25 1095.85 1039.23 pad description pad no. pad name i/o internal connection description 1, 2 vss negative power supply, ground 3, 19, 20 com1 com3, com2 o cmos output for lcd panel common 4~18 seg1~seg15 o cmos lcd segment output driver 21 mode i cmos with pull-high mode select input pin (internal pull-high 75k) 22 sel i cmos with pull-high correction digit shift switch (internal pull-high 75k) 23 set i cmos with pull-high correction digit data (internal pull-high 75k) 24 segon i cmos with pull-high est pin, if pull-low will force all segment on 25 reset i cmos with pull-low external reset input (internal pull-low, 50k) 26 test1 i cmos with pull-low test pin (not for customer) 27 osco o cmos crystal oscillator output pin 28 osci i cmos crystal oscillator input pin 29, 30 vdd positive power supply 31 vf4 o cmos double reference voltage 32, 33 lc2, lc1 i cmos connected to 0.1 f capacitor 34 vf2 o cmos reference voltage 35~40 rf1~rf6 i adjust regulator output voltage, trim pin 41~44 tr1~tr4 i adjust constant voltage and drive lamp output pin (open drain) 45 t i cmos with pull-high imprint time select input (internal pull-high 75k with latch type ) 46 d i cmos with pull-high imprint time external control input (internal pull-high 75k with latch type ) 47 x i cmos with pull-high imprint trigger input pin (internal pull-high 75k) 48 test2 i cmos with pull-high for coustomer test printing lcd use only, pull-low will force lamp on and other function is ok (internal pull-high 75k) 49 lamp o cmos drive lamp output pin (open drain) HT6750 rev. 1.00 3 may 13, 2002
absolute maximum ratings supply voltage .......................................................5.5v storage temperature ............................ 20 cto60 c input voltage ......................................................... 5.5v operating temperature...............................0 cto50 c static electricity (off power)...................................................................................200pf, 200v, 10 times to each pin note: these are stress ratings only. stresses exceeding the range specified under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil - ity. electrical characteristics ta=25 3 c, rh 65%, v ss =0v symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2.4 3 5.5 v v str oscillation start voltage 3v within 2 sec after power on (speed up oscillator when at power on reset) 2.4 v v stop oscillation stop voltage 3v 1.8 v i opr1 power consumption (1) 3v non-printing ta +20 c 23 a v l lamp drop voltage (reference vdd) 3v constant voltage reference vdd, at v dd =2.4v~5.5v (load is lamp 1.8v/40ma) 1.71 1.8 1.89 v i opr2 power consumption (2) 3v non-printing ta +50 c, rh=80% 9 a
t0/t time accuracy 3v ta=+20 c 90 090 sec/ month
t1/t time accuracy deviation (1) 3v ta= 10 c, deviation against ta=+20 c 170 112 70 sec/ month
t2/t time accuracy deviation (2) 3v ta=+35 c, deviation against ta=+20 c 25 8 0 sec/ month
t3/t time accuracy deviation (3) 3v ta=+35 c, deviation against ta=+20 c 95 55 10 sec/ month thold data hold time 3v at power interrupt (0.1 fat3v) 1 s i key-on on recognition current 3v when v ss =0v, x pin (v ss +0.5v), other pins 30 10 a a r key-off off recognition resistance 3v x pin, other pins 3 10 m m v il threshold voltage 3v x pin on function with mode, sel, set on v ss v ss +0.5v v v ih threshold voltage 3v with x pin off mode, sel, set off function v dd 0.5v v dd v HT6750 rev. 1.00 4 may 13, 2002 ( & ! 5 esd test
HT6750 rev. 1.00 5 may 13, 2002 functional description 6-digit timer in 5 modes : mode selection for 3 key ap - plications date from 1-1- 98 to 31-12- 49 (2049) automatic up - dating, including leap years. matrix address lcd interface in 1/3 duty, 1/2 bias, frame frequency is 43hz. printing enable is go low trigger in x input. v x 1/2 v dd , debounce in printing trigger: 1ms t debounce 2ms. after printing, will blink 3 times at 1hz rate. print means lamp output low to light lamp. lamp output sink current is 40ma min. (constant current source ), typical 45ma (v dd =2.4v~5.5v). printing time : 30ms, 45ms, 60ms or programmable (determined by the control cpu of the camera), se - lected by d or t and topt inputs. built-in crystal (32768hz) oscillator circuit (capacitor and resistor). at off mode ( - - - - - - ), printing (lamp on) and data setting is inhibited in any case and printing mark off. default value at power on is 9811 (asian date ). date and time cannot be set with printing mark on. lcd segment test pin is provided, a son is pull-low which will force all segments on. this test pin is nor - mally pull-high through an on chip 1k resistor. : mark is still at time mode, at time setting, digit se - lected by sel pin will blink at 1hz and 1/2 duty rate. at setting mode (set), printing mark is off and printing is inhibited. the selected digit (blinking) count up by one at short intervals (1.0sec t set 1.25sec), when the on key is pressed for less than 1.0sec; if the set key is pressed longer than 1.25sec, the digit will count up rapidly at 8hz rate. printing is disabled during data and time setting. debounce time of mode, sel, set key is: on recognition: when the on key is pressed longer than t on , on is recognized. 31.25ms t on 62.5ms, off recognition: when the on key is pressed longer than t off , off is recognized; the next input has to wait. 31.25ms t off 62.5ms, if at least one key-on time pulse is detected during the t off period, the time before the key-on pulse is regarded as the key-on time. the lamp light-up time is controlled depending on the levels of d and t pins. d t lamp signal output time h h 60ms h l 30ms l h depend on x input pulse width l l 45ms ? x pin must be carefully protected, the system can - not be reset when in 200v and 200pf one-shot test. (add external resistor 10k series with the pad; it s better if it works well without the resistor) at ? off mode, no data can be set. the x input is rejected in some condition, such as: off mode selection and setting mode power on reset and after crystal is stable (max. 2 sec) regulator output voltage accuracy is 2v 3.0% (after trim) display in day-hour-minute mode, in 24-hour system (0~23) operation flowchart mode selection sequence and initial value: ( mode key) in digit setting, press the set key the digit selected will blink at a 1hz rate. the blinking digit (selected digit) will count up by itself. if set key is pressed 1sec, the digit will count up rapidly at an 8hz rate, otherwise count up by 1 every time it s pressed ( 1sec). when the colon ( ? : ) is blinking in the day-hour-minute mode, pressing the set key will re - set the seconds to 00. 4 . 6 7 + 8 +
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lcd segment format HT6750 rev. 1.00 6 may 13, 2002 when digit is set, the mode key can interrupt the set - ting mode and change to the next mode. real time clock must count at any time even in change mode or adjusting mode. in 3-key application, connect swk to vss and sel. press the switch mode to change the mode as shown on the chart below, press sel to select reset - ting data, press set key to adjust the selected data. to select digit, press selection key ( sel key), mark is off during selection. at calendar mode, no matter what style calendar is displayed. the sequence of selected digit is always year month day normal state. the selected digit will blink at a 2hz rate. at time mode, day is not selected. the sequence of the selected digit is hour minute normal state. 9 , , 9 , , 9 , , 9 , , , : , : , : , : ; & . ) . 7 < . .
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application circuits HT6750 rev. 1.00 7 may 13, 2002 & 7 #
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HT6750 rev. 1.00 8 may 13, 2002 copyright 2002 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science-based industrial park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (sales office) 11f, no.576, sec.7 chung hsiao e. rd., taipei, taiwan tel: 886-2-2782-9635 fax: 886-2-2782-9636 fax: 886-2-2782-7128 (international sales hotline) holtek semiconductor (shanghai) inc. 7th floor, building 2, no.889, yi shan rd., shanghai, china tel: 021-6485-5560 fax: 021-6485-0313 http://www.holtek.com.cn holtek semiconductor (hong kong) ltd. rm.711, tower 2, cheung sha wan plaza, 833 cheung sha wan rd., kowloon, hong kong tel: 852-2-745-8288 fax: 852-2-742-8657 holmate semiconductor, inc. 48531 warm springs boulevard, suite 413, fremont, ca 94539 tel: 510-252-9880 fax: 510-252-9885 http://www.holmate.com

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