HT16565 24 Hour System VFD Digital Clock Features · VFD display 24 hour clock function · Integrated voltage regulator permits wide 4V to 16V operating voltage range · 4.194304MHz crystal oscillation · Four level contrast control function · Zero adjust function · 44-pin QFP package General Description clude a choice of adjustment modes, including single push increment or 2Hz fast forward functions. Additional features are provided in the form of Zero adjustment and four levels of contrast control. The HT16565 provides direct drive to VFD panels to implement a 24 hour clock function. In addition to obtaining its time base from a 4.194304MHz crystal oscillation source and in having a wide operating voltage, the device also contains a host of other features. These in- Block Diagram C M O S O S C O F r e q u e n c y D iv id e r s O s c illa to r 6 4 H z 1 H z 1 H z O S C I V D D T E S T 3 T e s t A d ju s tm e n t T E S T 2 T E S T 1 S e c o n d C o u n te r a 1 V V D D b 1 D D c 1 S E Z A H S V D e c o d e r S e g m e n t H o u r C o u n te r D e c o d e r S e g m e n t O p e n D r a in ] M S M in u te C o u n te r D r iv e r [P C H T im e A d ju s tm e n t A /C g 3 b 4 D D c 4 C O N T 2 a 4 , d 4 C o n tra s t A d ju s tm e n t C O N T 1 D IM V e 4 , g 4 D D T E S T 4 V D D S 1 2 2 4 Rev. 1.00 1 February 7, 2007 HT16565 Pin Assignment T T T T c 1 d 1 e 1 g 1 c 2 e 2 g 2 c 3 d 3 e 3 C S S A 1 4 2 3 4 c 4 g 3 a 4 , d H M E S T E S T N E S T E S T Z e 4 , g 4 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 g 3 1 d 3 c 3 2 3 2 3 3 1 4 3 0 e 3 g 2 5 6 7 g 1 e 1 d 1 c 1 2 9 H T 1 6 5 6 5 4 4 Q F P -A e 2 c 2 3 3 2 8 2 7 8 2 6 9 2 5 1 0 2 4 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 b 4 f3 a 3 T b 3 T 1 H z f2 a 2 , d 2 b 2 f1 a 1 b 1 T T e 4 , g Z E S T E S T N E S T E S T M H a 4 , d 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 c 4 1 A 2 3 2 3 3 1 4 1 4 3 0 4 C 5 H T 1 6 5 6 5 B 4 4 Q F P -B 6 3 7 2 S S 8 2 9 2 8 2 7 2 6 9 4 3 3 2 5 1 0 1 1 2 4 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 6 4 H D IM S E V D D C O N N C C O N V S S O S C O S C A /C z T 1 T 2 I O z O I b 1 a 1 f1 b 2 a 2 , d 2 f2 1 H z b 3 a 3 f3 b 4 A /C O S C O S C V S S C O N N C C O N V D D S E D IM 6 4 H T 2 T 1 Pin Description Pin Name I/O Description VDD O High voltage power supply pin. VSS ¾ Ground pin. DIM I CONT1 I CONT2 I Illumination level control pins. Internally connected to pull-up resistors. A/C I When the A/C pin is low, the internal circuits are reset. The reset pulse width should be more than 2ms. Internally connected to a pull-up resistor. ZA I Zero adjustment pin. Internally connected to a pull-down resistor. HS I Hour adjustment pin. Internally connected to a pull-down resistor. MS I Minute adjustment pin. Internally connected to a pull-down resistor. SE I Set enable pin. Internally connected to a pull-up resistor. OSCO O OSCI I TEST1, TEST2 I IC test pin - should be left open or kept at a low level TEST3, TEST4 I IC test pin - should be left open or kept at a high level 64Hz O 64Hz signal output pin for oscillation frequency adjustment O Segment output pins for VFD Illumination level control pins. Internally connected to pull-down resistors. Crystal oscillator pin a1, a3 ~ b2, b4, c4 a4, d4, e4, g4 1Hz Rev. 1.00 2 February 7, 2007 HT16565 Approximate Internal Connections Z A , M S , H S , D IM , C O N T 1 , T E S T 1 , T E S T 2 A /C , S E , C O N T 2 , T E S T 3 , T E S T 4 6 4 H z V D D V D D V D D V S S V S S V S S a 1 , a 3 ~ g 1 , g 3 ; a 2 , d 2 ~ g 2 ; a 4 , d 4 , e 4 , g 4 O S C I, O S C O O S C O ( O s c illa to r O u tp u t) V D D O S C I ( O s c illa to r In p u t) V S S Absolute Maximum Ratings Logic Supply Voltage .................VSS-0.3V to VSS+6.5V Driver Supply Voltage .................VSS-0.3V to VSS+20V High Input Voltage .....................VSS-0.3V to VCC+0.3V High Output Voltage ..................VSS-0.3V to VCC+0.3V Driver Output Voltage..........................VSS-0.3V to VDD Driver Output Current (Segment Driver) -10mA to +2mA Driver Output Current (Grid Driver) ......-7mA to +20mA Storage Temperature ..........................-55°C to +150°C Operating Temperature.........................-40°C to +85°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 VDD Power Supply Voltage 4 ¾ 16 V fOSC Oscillation Frequency ¾ 4.194304 ¾ MHz tOP Operating Temperature -40 ¾ 85 °C Rev. 1.00 3 February 7, 2007 HT16565 D.C. Characteristics VDD=6.0V, VSS=0V, Ta=-40°C~85°C Test Conditions Symbol Parameter VDD Conditions Min. Typ. Max. Unit VIH High Input Voltage 6V ¾ 4.3 ¾ ¾ V VIL Low Input Voltage 6V ¾ ¾ ¾ 1.0 V IIH Hi-level Input Current 6V VI=VDD for TEST1, TEST2, ZA, MS, HS, DIM, CONT1 30 ¾ 150 mA IIL1 VI=Vss for TEST3, TEST4 -120 ¾ -800 mA IIL2 VI=Vss for A/C -3 ¾ -12 mA VI=Vss for SE, CONT2 -30 ¾ -150 mA Low-level Input Current 6V IIL3 VOL Low-level Output current 6V IOL=VSS for all pin 5.9 ¾ ¾ V VOH Hi-level Output current 6V IOH=VSS for 64Hz pin ¾ ¾ 0.1 V IOH1 Output Current 6V VOH=4.0V for 1Hz, a2, d2, a4, d4, e4, g4 ¾ ¾ -2000 mA IOL1 Output Current 6V VOL=0V for 1Hz, a2, d2, a4, d4, e4, g4 1 ¾ ¾ mA IOH2 Output Current 6V VOH=4.0V, Other segment output pins except above ¾ ¾ -1000 mA IOL2 Output Current 6V VOL=VSS, Other segment output pins except above 1 ¾ ¾ mA IOH3 Output Current 6V VOH=5.5V for 64Hz pin ¾ ¾ -100 mA IOL3 Output Current 6V VOL=0.5V for 64Hz pin 100 ¾ ¾ mA 6V fOSC=4.194304MHz, No load, CIN=39pF±5%, COUT=33pF±5%, CI=70W±5% ¾ ¾ 2 mA IDD Dynamic Current Consumption Characteristics Curves VDD vs IDD Characteristics Curve ID D Ta=25°C ID (m A ) D v s V D D C h a r a c te r is tic s C u r v e 2 .5 2 .0 1 .5 1 .0 0 .5 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 V Rev. 1.00 4 D D (V ) February 7, 2007 HT16565 Functional Description VFD Display Driving Other Pin Functions The device can directly drive VFD clock panels dynamically. The clock will be displayed in a 24-hour format with the hours ranging from 0 to 23 and and minutes from 00 to 59. If the most significant numeral is zero then the display will be extinguished. The external reset pin A/C is used to reset the internal circuit of the device. When this pin is pulled low the device will be reset, when the pin is allowed to go high, via its internal pull-high resistor, then the display will indicate a ²0:00² output. · Segment connections In the open status, the SE pin is held to ²high² level by a pull-high resistor, enabling the inputs from MS, HS and ZA pins. These inputs become invalid by setting this pin to a ²low² level externally. A 7-segment display is shown below showing the illumination pattern for each numeral. A F B G E D C 7 -S e g m e n ts 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. In the open status, the TEST1 and TEST2 pins are kept at a ²0² level by pull-down resistors. As the device is designed for clock applications, four 7-segment displays are required to display the correct time output. The connections for the segments are shown below, however it should be noted that the fourth segment only requires two of its segments to be driven. a 4 a 3 g 4 e 4 d 4 f3 b 4 c 4 d ig it4 e 3 f2 b 3 g 3 c 3 d 3 e 2 1 H z d ig it3 f1 b 2 g 2 d 2 The Test pin function is as shown in the following table. a 1 a 2 1 H z In the open status, the TEST3 and TEST4 pins are kept at a ²1² level by pull-up resistors. c 2 d ig it2 e 1 b 1 g 1 d 1 c 1 d ig it1 TEST select function 1 Switch Pin Name Operating mode TEST1 TEST2 TEST3 0 (or Open) 0 (or Open) 1 (or Open) Normal function. F(Pulse) 1 1 (or Open) Input pulses to the 16.384kHz system of the circuit. 1 F(Pulse) 1 (or Open) Input pulses to the 16.384kHz system of the circuit. 1 F(Pulse) 0 Input pulses to the 64Hz system of the circuit. F(Pulse) 1 0 Input pulses to the 64Hz system of the circuit. F(Pulse) 0 (or Open) 0 Input pulses for the minute and hour counters, which advances 1 count with 1 pulse. No carry functions for hour and minute counters. TEST select function 2 Switch Pin Name Operating mode TEST3 DIM CONT1 CONT2 0 F(Pulse) * * The pulse widths of the all segment outputs are controlled by the pulse width of the DIM signal 0 0 * * Sets all segment outputs to high impedance Note: ²*² Indicates that the input level can be ²0² and ²1² Rev. 1.00 5 February 7, 2007 HT16565 Three illumination level set pins, DIM, CONT1 and CONT2 are provided to give control over the display brightness level, as shown in the following table. Switch Pin Name Operating mode DIM CONT1 CONT2 0 (or Open) * * 1 0 (or Open) 1 (or Open) 1 0 (or Open) 0 12.5% (1/8) duty display at 4096Hz 1 1 1 (or Open) 6.25% (1/16) duty display at 4096Hz 100% duty display 25% (1/4) duty display at 4096Hz Note: ²1² high level, ²0² low level, ²*² don¢t care · Zero adjustment Device Functions A zero adjust function is also included within the device and is controlled by the ZA pin. This pin is connected to an internal pull low resistor. Pulling this line high will reset both the internal minutes and seconds value, however the way in which the display is reset depends upon the present value of 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 increment by one. The following table illustrates a few examples of this operation. · 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 components. The usual provision of an external capacitor is not required as an internal reset capacitor is integrated within the device. · 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 determined by an external 4.194304MHz crystal. When an external crystal along with two small external capacitors are connected to the two oscillator pins, the internal oscillator circuit will ensure generation of the correct time base signals. The oscillation frequency, although determined by the external crystal frequency, will also be influenced by the external capacitors, the crystal inherent capacitance and the residual capacitance of the external PCB tracks. To ensure accurate frequency generation, the crystal specification should be taken into account and care taken to place the external capacitors and crystal as close to the device as possible. 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 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-low resistors. Each time one of these lines is pulled high, the respective hour or minute value will increment by one, also if the line is continuously held high then the respective value will increment automatically at a rate of 2Hz. Both values will increment together if both lines are pulled high simultaneously. Note that no carry functions will be implemented when either the hour or minute value overflows. Rev. 1.00 6 February 7, 2007 HT16565 Application Circuits V V E f C C D D F + V D D T E S T 1 T E S T 1 1 H a 1 b 1 c 1 d 1 e 1 f1 g 1 a 2 b 2 c 2 e 2 f2 g 2 a 3 b 3 c 3 d 3 e 3 f3 g 3 b 4 c 4 a 4 e 4 1 H z a 1 b 1 c 1 d 1 e 1 f1 g 1 a 2 , d 2 b 2 c 2 e 2 f2 g 2 a 3 b 3 c 3 d 3 e 3 f3 g 3 b 4 c 4 a 4 , d 4 e 4 , g 4 T E S T 2 T E S T 2 H S H S M S M S Z A Z A D IM D IM C O N T 1 C O N T 1 T E S T 3 T E S T 3 T E S T 4 T E S T 4 S E F z , d 2 S ta tic T y p e C lo c k V F D , d 4 , g 4 S E A /C O S C O A /C C 1 Y 1 4 .1 9 4 3 0 4 M H z C O N T 2 C O N T 2 O S C I C 2 1 6 4 H z V S S J 1 C O N 1 Note: Capacitors C1 and C2 can adjust the frequency accuracy Rev. 1.00 7 February 7, 2007 HT16565 Package Information 44-pin QFP (10´10) Outline Dimensions H C D G 2 3 3 3 I 3 4 2 2 F A B E 1 2 4 4 K = J 1 Symbol Rev. 1.00 1 1 Dimensions in mm Min. Nom. Max. A 13 ¾ 13.4 B 9.9 ¾ 10.1 C 13 ¾ 13.4 D 9.9 ¾ 10.1 E ¾ 0.8 ¾ F ¾ 0.3 ¾ G 1.9 ¾ 2.2 H ¾ ¾ 2.7 I ¾ 0.1 ¾ J 0.73 ¾ 0.93 K 0.1 ¾ 0.2 a 0° ¾ 7° 8 February 7, 2007 Preliminary HT16565 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. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 86-21-6485-5560 Fax: 86-21-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com Copyright Ó 2007 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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. Rev. 1.00 9 February 7, 2007