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HT16565 24 Hour System VFD Digital Clock
Features
* VFD display 24 hour clock function * 4.194304MHz crystal oscillation * Zero adjust function * Integrated voltage regulator permits wide 4V to 16V
operating voltage range
* Four level contrast control function * 44-pin QFP package
General Description
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 include 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.
Block Diagram
OSCO O s c illa to r OSCI V TEST3 TEST2 TEST1 V
DD
CMOS F r e q u e n c y D iv id e r s 1Hz
64Hz 1Hz
Test A d ju s tm e n t
S e c o n d C o u n te r a1
DD
V
DD
b1 c1 T im e A d ju s tm e n t
A /C SE ZA MS HS
M in u te C o u n te r
D ecoder Segm ent
D r iv e r [P C H
H o u r C o u n te r
D ecoder Segm ent
O p e n D r a in ]
g3 b4 c4 a4,d4
V CONT2 CONT1 D IM
DD
C o n tra s t A d ju s tm e n t
e4,g4
V TEST4 V S1224
DD
DD
Rev. 1.00
1
February 7, 2007
HT16565
Pin Assignment
T T T a4,d H M EST EST N EST EST Z e4,g c4 g3 e3 d3 c3
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 2 1
T c1 d1 e1 g1 c2 e2 g2 c3 d3 g3 e3 C S S A 1 4 3 2 4
33 32 31 30 44 43 42 41 40 39 38 37 36 35 34
4 b4 f3 a3 1Hz f2 a2,d2 b2 f1 a1 b1 T T b3 T T e4,g Z EST EST N EST EST M H a4,d c4 A 1 4 C 3 S S 4 2
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 7 5 6 4
4
2 3
1
44 43 42 41 40 39 38 37 36 35 34
33 32 31 30
g2 e2 c2 g1 e1 d1 c1
H T16565 4 4 Q F P -A
29 28 27 26 25 24 23
H T16565B 4 4 Q F P -B
29 28 27 26 25 24 23
64H D IM SE VDD CON NC CON VSS OSC OSC A /C
z
T1 T2 I O
f3 b4
a3
b1 a1 f1 b2 a2,d2 f2 1Hz b3
Pin Description
Pin Name VDD VSS DIM CONT1 CONT2 I/O O 3/4 I I I High voltage power supply pin. Ground pin. Illumination level control pins. Internally connected to pull-down resistors. Illumination level control pins. Internally connected to pull-up resistors. 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. Zero adjustment pin. Internally connected to a pull-down resistor. Hour adjustment pin. Internally connected to a pull-down resistor. Minute adjustment pin. Internally connected to a pull-down resistor. Set enable pin. Internally connected to a pull-up resistor. Crystal oscillator pin OSCI TEST1, TEST2 TEST3, TEST4 64Hz a1, a3 ~ b2, b4, c4 a4, d4, e4, g4 1Hz O Segment output pins for VFD I I I O IC test pin - should be left open or kept at a low level IC test pin - should be left open or kept at a high level 64Hz signal output pin for oscillation frequency adjustment Description
A /C OSC OSC VSS CON NC CON VDD SE D IM 64H z I O T1 T2
A/C
I
ZA HS MS SE OSCO
I I I I O
Rev. 1.00
2
February 7, 2007
HT16565
Approximate Internal Connections
Z A , M S , H S , D IM , C O N T 1 , TEST1,TEST2 A /C , S E , C O N T 2 , T E S T 3 , T E S T 4 64Hz
VDD
VDD
VDD
VSS
VSS
VSS
a1,a3 ~ g1,g3;a2,d2 ~ g2; a4,d4,e4,g4
O S C I, O S C O
OSCO ( O s c illa to r O u tp u t) VDD OSCI ( O s c illa to r In p u t) VSS
Absolute Maximum Ratings
Logic Supply Voltage .................VSS-0.3V to VSS+6.5V High Input Voltage .....................VSS-0.3V to VCC+0.3V Driver Output Voltage..........................VSS-0.3V to VDD Driver Output Current (Grid Driver) ......-7mA to +20mA Operating Temperature.........................-40C to +85C 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. Driver Supply Voltage .................VSS-0.3V to VSS+20V High Output Voltage ..................VSS-0.3V to VCC+0.3V Driver Output Current (Segment Driver) -10mA to +2mA Storage Temperature ..........................-55C to +150C
Recommended Operating Conditions
Symbol VDD fOSC tOP Parameter Power Supply Voltage Oscillation Frequency Operating Temperature Min. 4 3/4 -40 Typ. 3/4 4.194304 3/4 Max. 16 3/4 85 Unit V MHz C
Rev. 1.00
3
February 7, 2007
HT16565
D.C. Characteristics
Test Conditions Symbol VIH VIL IIH IIL1 IIL2 IIL3 VOL VOH IOH1 IOL1 IOH2 IOL2 IOH3 IOL3 Low-level Output current Hi-level Output current Output Current Output Current Output Current Output Current Output Current Output Current 6V 6V 6V 6V 6V 6V 6V 6V Low-level Input Current 6V Parameter VDD High Input Voltage Low Input Voltage Hi-level Input Current 6V 6V 6V Conditions 3/4 3/4 VI=VDD for TEST1, TEST2, ZA, MS, HS, DIM, CONT1 VI=Vss for TEST3, TEST4 VI=Vss for A/C VI=Vss for SE, CONT2 IOL=VSS for all pin IOH=VSS for 64Hz pin VOH=4.0V for 1Hz, a2, d2, a4, d4, e4, g4 VOL=0V for 1Hz, a2, d2, a4, d4, e4, g4 VOH=4.0V, Other segment output pins except above VOL=VSS, Other segment output pins except above VOH=5.5V for 64Hz pin VOL=0.5V for 64Hz pin fOSC=4.194304MHz, No load, CIN=39pF5%, COUT=33pF5%, CI=70W5% 4.3 3/4 30 -120 -3 -30 5.9 3/4 3/4 1 3/4 1 3/4 100 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.0 150 -800 -12 -150 3/4 0.1 -2000 3/4 -1000 3/4 -100 3/4 V V mA mA mA mA V V mA mA mA mA mA mA Min. Typ. Max. Unit VDD=6.0V, VSS=0V, Ta=-40C~85C
IDD
Dynamic Current Consumption
6V
3/4
3/4
2
mA
Characteristics Curves
VDD vs IDD Characteristics Curve Ta=25C
ID
D
(m A ) 2 .5
ID
D
vs V
DD
C h a r a c te r is tic s C u r v e
2 .0
1 .5
1 .0
0 .5
0 2
4
6
8
10
12
14
16 V
DD
18 (V )
Rev. 1.00
4
February 7, 2007
HT16565
Functional Description
VFD Display Driving 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.
* Segment connections
Other Pin Functions 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 0:00 output. In the open status, the SE pin is held to high 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 low level externally. 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 0 level by pull-down resistors. In the open status, the TEST3 and TEST4 pins are kept at a 1 level by pull-up resistors. The Test pin function is as shown in the following table.
A 7-segment display is shown below showing the illumination pattern for each numeral.
A F G D C E B
7 -S e g m e n ts
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.
a4 g4 e4 d4 d ig it4 c4 b4 e3 f3 d3 d ig it3 a3 g3 c3 b3 e2 1Hz 1Hz a2 f2 d2 d ig it2 g2 c2 b2 e1 f1 d1 d ig it1 a1 g1 c1 b1
TEST select function 1 Switch Pin Name TEST1 0 (or Open) F(Pulse) 1 1 F(Pulse) F(Pulse) TEST2 0 (or Open) 1 F(Pulse) F(Pulse) 1 0 (or Open) TEST3 1 (or Open) 1 (or Open) 1 (or Open) 0 0 0 Normal function. Input pulses to the 16.384kHz system of the circuit. Input pulses to the 16.384kHz system of the circuit. Input pulses to the 64Hz system of the circuit. Input pulses to the 64Hz system of the circuit. Input pulses for the minute and hour counters, which advances 1 count with 1 pulse. No carry functions for hour and minute counters. Operating mode
TEST select function 2 Switch Pin Name TEST3 0 0 DIM F(Pulse) 0 CONT1 * * CONT2 * * Operating mode The pulse widths of the all segment outputs are controlled by the pulse width of the DIM signal Sets all segment outputs to high impedance
Note: * Indicates that the input level can be 0 and 1 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 DIM 0 (or Open) 1 1 1 CONT1 * 0 (or Open) 0 (or Open) 1 CONT2 * 1 (or Open) 0 1 (or Open) 100% duty display 25% (1/4) duty display at 4096Hz 12.5% (1/8) duty display at 4096Hz 6.25% (1/16) duty display at 4096Hz Operating mode
Note: 1 high level, 0 low level, * dont care
Device Functions
* Reset
* Zero adjustment
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. Time Adjustment Operation
* Hour/minute adjustment
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. Zero Adjust Examples Present Time Hr. 1 2 2 2 2 3 Min. 30 00 29 30 59 29 Sec. 00 00 59 00 59 59 After Zero Adjust Hr. 2 2 2 3 3 3 Min. 00 00 00 00 00 00 Sec. 00 00 00 00 00 00
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
DD CC
Ef
TEST1 TEST1 TEST2 TEST2 HS HS MS MS ZA ZA D IM D IM CONT1 CONT1 TEST3 TEST3 TEST4 TEST4 SE SE A /C A /C CONT2 CONT2
VDD 1Hz a1 b1 c1 d1 e1 f1 g1 a2,d2 b2 c2 e2 f2 g2 a3 b3 c3 d3 e3 f3 g3 b4 c4 a4,d4 e4,g4
F+ 1H a1 b1 c1 d1 e1 f1 g1 a2 b2 c2 e2 f2 g2 a3 b3 c3 d3 e3 f3 g3 b4 c4 a4 e4 z
F-
,d2 S ta tic T y p e C lo c k V F D
,d4 ,g4
OSCO Y1 4 .1 9 4 3 0 4 M H z OSCI C2 1 J1
C1
64Hz VSS
CON1
Note: Capacitors C1 and C2 can adjust the frequency accuracy
Rev. 1.00
7
February 7, 2007
HT16565
Package Information
44-pin QFP (1010) Outline Dimensions
C D G 23 I 34 22 F A B E 44 12 K 1 11 = J 33 H
Symbol A B C D E F G H I J K a
Dimensions in mm Min. 13 9.9 13 9.9 3/4 3/4 1.9 3/4 3/4 0.73 0.1 0 Nom. 3/4 3/4 3/4 3/4 0.8 0.3 3/4 3/4 0.1 3/4 3/4 3/4 Max. 13.4 10.1 13.4 10.1 3/4 3/4 2.2 2.7 3/4 0.93 0.2 7
Rev. 1.00
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 O 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. Holteks 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

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