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ht16566 1/2 duty vfd digital clock block diagram note: * col indicates a blink colon and col indicates a continuous light colon. rev. 1.10 1 december 17, 2010 features vfd display 24 hour clock function directly drive vfd panels at 1/2 duty cycle 4.194304mhz crystal oscillation zero adjust function integrated voltage regulator permits wide 4v to 18v operating voltage range four levels of illumination control function 30-pin ssop package general description the ht16566 provides direct drive to vfd panels to im - plement a 24 hour clock function. obtaining its time base from a 4.194304mhz crystal oscillation source and in having a wide operating voltage due to its internal voltage regulator, the device also contains a host of other features. these include a choice of adjustment modes, including single push increment or 2hz fast for - ward functions. additional features are provided in the form of blank control, zero adjustment and four levels of illumination control.

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pin assignment note: * col indicates a blink colon and col indicates a continuous light colon. pin description pin name i/o description vcc high voltage power supply pin. vdd o built-in regulator voltage output pin for the device internal circuits. vss ground pin. dim1 i illumination level control pins. internally connected to pull-down resistors. dim2 i a/c i when the a/c pin is low, the internal circuits are reset. the reset pulse width should be more than 2 s. internally connected to a pull-high resistor. za i zero adjustment pin. internally connected to a pull-high resistor. hs i hour adjustment pin. internally connected to a pull-high resistor. ms i minute adjustment pin. internally connected to a pull-high resistor. blank i when low the blank input pin will extinguish the display. internally connected to a pull-down resistor. xt o crystal oscillator pin xt i test i ic test pin - should be left open or kept at a low level 64hz o 64hz signal output pin for oscillation frequency adjustment gr1 o grid output pins for 1/2 duty vfd gr2 o 1a,3a ~ 2b,4b,4c o segment output pins for 1/2 duty vfd ht16566 rev. 1.10 2 december 17, 2010 " # 7 ) 8 9 : ; " # 7 8 9 : " ; ; " : " 9 " 8 " ) " 7 " # " " " " )

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approximate internal connections absolute maximum ratings logic supply voltage .................v ss 0.3v to v ss +6.5v driver supply voltage .................v ss 0.3v to v ss +20v high input voltage .....................v ss 0.3v to v cc +0.3v high output voltage ..................v ss 0.3v to v cc +0.3v logic input voltage ....................v ss 0.3v to v dd +0.3v logic output voltage .................v ss 0.3v to v dd +0.3v driver output voltage..........................v ss 0.3v to v cc driver output current (segment driver) 10ma to +2ma driver output current (grid driver) ...... 7ma to +20ma storage temperature .......................... 55 c to +150c operating temperature......................... 40 cto+85 c 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 reliability. recommended operating conditions symbol parameter min. typ. max. unit v cc power supply voltage 4 18 v f osc oscillation frequency 4.194304 mhz t op operating temperature 40 85 c ht16566 rev. 1.10 3 december 17, 2010

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d.c. characteristics v cc =12v, v ss =0v, ta= 40c~85c symbol parameter test conditions min. typ. max. unit v dd conditions v ih high input voltage v cc =8vto18v 3.6 v v il low input voltage v cc =8vto18v 1v i il1 low-level input current 18v dim1, dim2, blank , test pins low 1 a i ih1 hi-level input current 18v dim1, dim2, blank, test pins high 50 200 a i il2 low-level input current 18v xt pin low 3 3 a i ih2 hi-level input current 18v xt pin high 3 3 a i il3 low-level input current 18v a/c ,za ,hs ,ms pins low 200 50 a i ol low-level output current 12v v ol = 0.5v for 64hz pin 100 a i oh hi-level output current 12v v ol = 4.0v for 64hz pin 100 a i sol driver output low voltage (all segment outputs) 12v v sol = 0.7v 15 a i soh driver output high voltage (all segment outputs) 12v v sol = 11.3v 1.0 ma i gol driver output low voltage (grid1,grid2) 12v v sol = 0.7v 15 a i goh driver output high voltage (grid1,grid2) 12v v sol = 11.3v 15 ma i cc dynamic current consumption 12v f osc = 4.194304mhz, oscillator external capacitors = 22pf 1.0 ma ht16566 rev. 1.10 4 december 17, 2010
ht16566 rev. 1.10 5 december 17, 2010 functional description vfd display driving the display can directly drive vfd signals dynamically and does so at a 1/2 duty cycle rate. the clock will be displayed in a 24-hour format with the hours ranging from 0 to 23 and minutes from 00 to 59. if the most sig - nificant numeral is zero then the display will be extin - guished. grid and segment connections a single 7-segment display is shown below showing the illumination pattern for each numeral. as the device is designed for clock applications, four 7-segment displays are required to display the correct time output. the connections for the grids and seg - ments are shown below, however it should be noted that the fourth segment only requires two of its seg - ments to be driven. additionally it should be noted that the colon can also be illuminated. other pin functions the external reset pin a/c is used to reset the internal circuits of the device. when this pin is pulled low the de - vice will be reset, when the pin is allowed to go high, via its internal pull-high resistor, then the display will indi - cate a 0:00 output. the blank pin, if pulled low will extinguish the display. note that during the time when the blank pin is low, the hs ,ms and za pins will be automatically disabled by the device and have no function. the 64hz pin allows monitoring of the system frequency to allow frequency adjustments to be executed. as the name suggests, this output pin will continuously output a frequency of 64hz. the test pin is used during manufacturing for device testing purposes and should not be connected to any external circuitry. two illumination level set pins, dim1 and dim2, are pro - vided to give control over the display brightness level, as shown in the following table. switch pin name operating mode dim1 dim2 l l f=256hz, 1/2 duty (50% display) h l f=256hz, 1/4 duty (25% display) l h f=256hz, 1/8 duty (12.5% display) h h f=256hz, 1/16 duty (6.25% display) device functions reset although the device is provided with an external reset pin a/c , the device will in fact reset itself when power is applied, eliminating the need for external reset com - ponents. the usual provision of an external capacitor is not required as an internal reset capacitor is inte - grated within the device. internal regulator an internal regulator function is also integrated within the device providing a stable voltage power supply source for the internal circuits. this allows the device to operate with a wide external power supply ranging from 4v to 18v. chatter removal the device contains circuits which are connected to input pins hs ,ms and za to remove chatter of less than 31.25ms. oscillator the basic time base frequency for this device is deter - mined by an external 4.194304mhz crystal. when an external crystal along with two small external capaci - tors are connected to the two oscillator xt pins, the in - ternal oscillator circuit will ensure generation of the correct time base signals. the oscillation frequency, although determined by the external crystal fre - quency, will also be influenced by the external capaci - tors, the crystal inherent capacitance and the residual capacitance of the external pcb tracks. to ensure ac - curate frequency generation, the crystal specification should be carefully consulted and the external capaci - tors and crystal should be placed as close to the de - vice as possible.
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application circuits note: capacitor c1 and c2 can adjust the accuracy of frequency ht16566 rev. 1.10 6 december 17, 2010 time adjustment operation hour/minute adjustment both the minutes and hour displays can be adjusted separately or both together in a fast forward format. the hour set pin, hs , and the minutes set pin, ms , are used to make these adjustments. both of these pins are connected to internal pull-high resistors. each time one of these lines is pulled low, the respective hour or minute value will increment by one, also if the line is continuously held low then the respective value will increment automatically at a rate of 2hz. both val - ues will increment together if both lines are pulled low simultaneously. note that no carry functions will be im - plemented when either the hour or minute value over - flows. zero adjustment a zero adjust function is also included within the de - vice and is controlled by the za pin. this pin is con - nected to an internal pull-high resistor. pulling this line low will reset both the internal minutes and seconds value, however the way in which the display is reset depends upon the present value of the display. if the minute value is presently less than 30 the only the second and minute values will be reset to zero and the hour value remain unchanged. however if the minute value is presently at a value of 30 or higher then when the zero adjustment function is executed, a carry will be implemented and the hour value will be incre - mented by one. the following table illustrates a few examples of this operation. zero adjust examples present time after zero adjust hr. min. sec. hr. min. sec. 1 30 00 2 00 00 2 00 00 2 00 00 2 29 59 2 00 00 2 30 00 3 00 00 2 59 59 3 00 00 3 29 59 3 00 00 !
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package information 30-pin ssop (209mil) outline dimensions mo-150 symbol dimensions in inch min. nom. max. a 0.291 0.323 b 0.197 0.220 c 0.009 0.013 c 0.390 0.413 d 0.079 e 0.026 f 0.002 g 0.022 0.037 h 0.004 0.008 08 symbol dimensions in mm min. nom. max. a 7.40 8.20 b 5.00 5.60 c 0.22 0.33 c 9.90 10.50 d 2.00 e 0.65 f 0.05 g 0.55 0.95 h 0.09 0.21 08 ht16566 rev. 1.10 7 december 17, 2010 ; ) 7 - & % * ,
ht16566 rev. 1.10 8 december 17, 2010 copyright
2010 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 s products are not authorized for use as critical components in life support devices or systems. 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 park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales office) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shenzhen sales office) 5f, unit a, productivity building, no.5 gaoxin m 2nd road, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor (usa), inc. (north america sales office) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com

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