display hour clock function 4.194304MHz crystal oscillation Zero adjus

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display hour clock function 4.194304MHz crystal oscillation Zero adjus

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HT16561 Digital Clock
display hour clock function 4.194304MHz crystal oscillation Zero adjust function Integrated voltage regulator permits wide
operating voltage range
Four level contrast control function 44-pin package
General Description
HT16561 provides direct drive panels implement hour clock function. addition obtaining time base from 4.194304MHz crystal oscillation source having wide operating voltage, device also contains host other features. These include choice adjustment modes, including single push increment fast forward functions. Additional features provided form Zero adjustment four levels contrast control.
Block Diagram
illa
Rev. 1.00
February 2007
HT16561
Assignment
Description
Name CONT1 CONT2 High voltage power supply pin. Ground pin. Illumination level control pins. Internally connected pull-down resistors. Illumination level control pins. Internally connected pull-up resistors. When low, internal circuits reset. reset pulse width should more than 2ms. Internally connected pull-up resistor. Zero adjustment pin. Internally connected pull-down resistor. Hour adjustment pin. Internally connected pull-down resistor. Minute adjustment pin. Internally connected pull-down resistor. enable pin. Internally connected pull-up resistor. Crystal oscillator OSCI TEST1, TEST2 TEST3, TEST4 64Hz Segment output pins test should left open kept level test should left open kept high level 64Hz signal output oscillation frequency adjustment Description
OSCO
Rev. 1.00
February 2007
HT16561
Approximate Internal Connections
illa illa
Absolute Maximum Ratings
Logic Supply Voltage .VSS-0.3V VSS+6.5V High Input Voltage .VSS-0.3V VCC+0.3V Driver Output Voltage.VSS-0.3V Driver Output Current (Grid Driver) .-7mA +20mA Operating Temperature.-40°C +85°C Note: These stress ratings only. Stresses exceeding range specified under Maximum cause substantial damage device. Functional operation this device other conditions beyond those listed specification implied prolonged exposure extreme conditions affect device reliability. Driver Supply Voltage .VSS-0.3V VSS+20V High Output Voltage .VSS-0.3V VCC+0.3V Driver Output Current (Segment Driver) -10mA +2mA Storage Temperature .-55°C +150°C
Recommended Operating Conditions
Symbol fOSC Parameter Power Supply Voltage Oscillation Frequency Operating Temperature Min. Typ. 4.194304 Max. Unit
Rev. 1.00
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HT16561
D.C. Characteristics
Test Conditions Symbol IIL1 IIL2 IIL3 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 Low-level Input Current Parameter High Input Voltage Input Voltage Hi-level Input Current Conditions VI=VDD TEST1, TEST2, DIM, CONT1 VI=Vss TEST3, TEST4 VI=Vss VI=Vss CONT2 IOL=VSS IOH=VSS 64Hz VOH=4.0V 1Hz, VOL=0V 1Hz, VOH=4.0V, Other segment output pins except above VOL=VSS, Other segment output pins except above VOH=5.5V 64Hz VOL=0.5V 64Hz fOSC=4.194304MHz, load, CIN=39pF±5%, COUT=33pF±5%, CI=70W±5% -120 -800 -150 -2000 -1000 -100 Min. Typ. Max. Unit VDD=6.0V, VSS=0V, Ta=-40°C~85°C
Dynamic Current Consumption
Characteristics Curves
Characteristics Curve Ta=25°C
Rev. 1.00
February 2007
HT16561
Functional Description
Display Driving device directly drive clock panels dynamically. clock will displayed 12-hour format with hours ranging from minutes from most significant numeral zero then display will extinguished.
Segment connections
Other Functions external reset used reset internal circuit device. When this pulled device will reset, when allowed high, internal pull-high resistor, then display will indicate output. open status, held level pull-high resistor, enabling inputs from pins. These inputs become invalid setting this level externally. 64Hz allows monitoring system frequency allow frequency adjustments executed. name suggests, this output will continuously output frequency 64Hz. open status, TEST1 TEST2 pins kept level pull-down resistors. open status, TEST3 TEST4 pins kept level pull-up resistors. Test function shown following table.
7-segment display shown below showing illumination pattern each numeral.
device designed clock applications, four 7-segment displays required display correct time output. connections segments shown below, however should noted that fourth segment only requires segments driven.
TEST select function Switch Name TEST1 Open) F(Pulse) F(Pulse) F(Pulse) TEST2 Open) F(Pulse) F(Pulse) Open) TEST3 Open) Open) Open) Normal function Input pulses 16.384KHz system circuit. Input pulses 16.384KHz system circuit. Input pulses 64Hz system circuit. Input pulses 64Hz system circuit. Input pulses minute hour counters, which advances count with pulse. carry functions hour minute counters. Operating mode
TEST select function Switch Name TEST3 F(Pulse) CONT1 CONT2 Operating mode pulse widths segment outputs controlled pulse width signal Sets segment outputs high impedance
Note: Indicates that input level Rev. 1.00 February 2007
HT16561
Three illumination level pins, DIM, CONT1 CONT2 provided give control over display brightness level, shown following table. Switch Name Open) CONT1 Open) Open) CONT2 Open) Open) 100% duty display (1/4) duty display 4096Hz 12.5% (1/8) duty display 4096Hz 6.25% (1/16) duty display 4096Hz Operating mode
Note: high level, level, care
Device Functions
Reset
Zero adjustment
Although device provided with external reset A/C, device will fact reset itself when power applied, eliminating need external reset components. usual provision external capacitor required internal reset capacitor integrated within device.
Chatter removal
device contains circuits which connected input pins remove chatter less than 31.25ms.
Oscillator
basic time base frequency this device determined external 4.194304MHz crystal. When external crystal along with small external capacitors connected oscillator pins, internal oscillator circuit will ensure generation correct time base signals. oscillation frequency, although determined external crystal frequency, will also influenced external capacitors, crystal inherent capacitance residual capacitance external tracks. ensure accurate frequency generation, crystal specification should taken into account care taken place external capacitors crystal close device possible. Time Adjustment Operation
Hour/minute adjustment
zero adjust function also included within device controlled pin. This connected internal pull resistor. Pulling this line high will reset both internal minutes seconds value, however which display reset depends upon present value display. minute value presently less than only second minute values will reset zero hour value remain unchanged. However minute value presently value higher then when zero adjustment function executed, carry will implemented hour value will increment one. following table illustrates examples this operation. Zero Adjust Examples Present Time Min. Sec. After Zero Adjust Min. Sec.
Both minutes hour displays adjusted separately both together fast forward format. hour pin, minutes pin, used make these adjustments. Both these pins connected internal pull-low resistors. Each time these lines pulled high, respective hour minute value will increment one, also line continuously held high then respective value will increment automatically rate 2Hz. Both values will increment together both lines pulled high simultaneously. Note that carry functions will implemented when either hour minute value overflows. Rev. 1.00 February 2007
HT16561
Application Circuits
Note: Capacitors adjust frequency accuracy
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HT16561
Package Information
44-pin Outline Dimensions
Symbol
Dimensions Min. 0.73 Nom. Max. 13.4 10.1 13.4 10.1 0.93
Rev. 1.00
February 2007
HT16561
Holtek Semiconductor Inc. (Headquarters) No.3, Creation 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, 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) Floor, Building No.889, 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 Productivity Building, Cross Science Road Gaoxin Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9722 Fax: 86-755-8616-9533 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan 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 Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holmate Semiconductor, Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holmate.com
Copyright 2007 HOLTEK SEMICONDUCTOR INC. information appearing this Data Sheet believed accurate time publication. However, Holtek assumes responsibility arising from specifications described. applications mentioned herein used solely purpose illustration Holtek makes warranty representation that such applications will suitable without further modification, recommends products application that present risk human life malfunction otherwise. products authorized critical components life support devices systems. Holtek reserves right alter products without prior notification. most up-to-date information, please visit site http://www.holtek.com.tw.
Rev. 1.00
February 2007

display hour clock function 4.194304MHz crystal oscillation Zero adjus

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