display hour clock function Directly drive panels Duty cycle 4.194304M

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display hour clock function Directly drive panels Duty cycle 4.194304M

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HT16562 Duty Digital Clock
display hour clock function Directly drive panels Duty cycle 4.194304MHz crystal oscillation Zero adjust function Integrated voltage regulator permits wide
operating voltage range
Four levels illumination control function 30-pin SSOP package
General Description
HT16562 provides direct drive panels implement hour clock function. Obtaining time base from 4.194304MHz crystal oscillation source having wide operating voltage internal voltage regulator, device also contains host other features. These include choice adjustment modes, including single push increment fast forward functions. Additional features provided form Blank control, Zero adjustment four levels illumination control.
Block Diagram
illa
Note: indicates blink colon indicates continuous light colon. Rev. 1.00 March 2007
HT16562
Assignment
Note: indicates blink colon indicates continuous light colon.
Description
Name DIM1 DIM2 High voltage power supply pin. Built-in regulator voltage output device internal circuits. Ground pin. Illumination level control pins. Internally connected pull-down resistors. When low, internal circuits reset. reset pulse width should more than 2ms. Internally connected pull-high resistor. Zero Adjustment pin. Internally connected pull-high resistor. Hour Adjustment pin. Internally connected pull-high resistor. Minute Adjustment pin. Internally connected pull-high resistor. When Blank input will extinguish display. Internally connected pull-down resistor. Crystal oscillator TEST 64Hz 1a,3a 2b,4b,4c Grid output pins duty Segment output pins duty test should left open kept level 64Hz signal output oscillation frequency adjustment Description
BLANK
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HT16562
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 Logic Input Voltage .VSS-0.3V VDD+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 Logic Output Voltage .VSS-0.3V VDD+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
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HT16562
D.C. Characteristics
Test Conditions Symbol IIL1 IIH1 IIL2 IIH2 IIL3 ISOL ISOH IGOL IGOH Parameter High Input Voltage Input Voltage Low-level Input Current Hi-level Input Current Low-level Input Current Hi-level Input Current Low-level Input Current Low-level Output current Hi-level Output current Driver Output Voltage (All Segment outputs) Driver Output High Voltage (All Segment outputs) Driver Output Voltage (Grid1,Grid2) Driver Output High Voltage (Grid1,Grid2) Dynamic Current Consumption Conditions VCC= VCC= Dim1, Dim2, BLANK, Test pins Dim1, Dim2, BLANK, Test pins high -200 -100 -1.0 Min. Typ. Max. Unit VCC=12V, VSS=0V, Ta=-40°C~85°C
high A/C, pins VOL= 0.5V 64Hz VOL= 4.0V 64Hz VSOL= 0.7V VSOL= 11.3V VSOL= 0.7V VSOL= 11.3V fOSC= 4.194304MHz, Oscillator external capacitors 22pF
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HT16562
Functional Description
Display Driving display directly drive signals dynamically does duty cycle rate. clock will displayed 12-hour format with hours ranging from minutes from most significant numeral zero then display will extinguished.
Grid segment connections
TEST used during manufacturing device testing purposes should connected external circuitry. illumination level pins, DIM1 DIM2, provided give control over display brightness level, shown following table. Switch Name Dim1 Dim2 f=256Hz, duty (50% display) f=256Hz, duty (25% display) f=256Hz, duty (12.5% display) f=256Hz, 1/16 duty (6.25% display)
single 7-segment display shown below showing illumination pattern each numeral.
Operating mode
device designed clock applications, four 7-segment displays required display correct time output. connections grids segments shown below, however should noted that fourth segment only requires segments driven. Additionally should noted that colon also illuminated.
Device Functions
Reset
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.
Internal regulator
internal regulator function also integrated within device providing stable voltage power supply source internal circuits. This allows device operate with wide external power supply ranging from 18V.
Chatter removal
Other Functions external reset used reset internal circuits device. When this pulled device will reset, when allowed high, internal pull-high resistor, then display will indicate output. BLANK pin, pulled will extinguish display. Note that during time when BLANK low, pins will automatically disabled device have function. 64Hz allows monitoring system frequency allow frequency adjustments executed. name suggests, this output will continuously output frequency 64Hz.
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 carefully consulted external capacitors crystal should placed close device possible.
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March 2007
HT16562
Time Adjustment Operation
Hour/minute adjustment
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-high resistors. Each time these lines pulled low, respective hour minute value will increment one, also line continuously held then respective value will increment automatically rate 2Hz. Both values will increment together both lines pulled simultaneously. Note that carry functions will implemented when either hour minute value overflows.
Zero adjustment
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 incremented one. following table illustrates examples this operation. Zero Adjust Examples Present Time Min. Sec. After Zero Adjust Min. Sec.
zero adjust function also included within device controlled pin. This connected internal pull-high resistor. Pulling this line will reset both internal minutes seconds value, however which display reset depends upon present value display.
Application Circuits
Note: Capacitor adjust accuracy frequency Rev. 1.00 March 2007
HT16562
Package Information
30-pin SSOP (300mil) Outline Dimensions
Symbol
Dimensions Min. Nom. Max.
Rev. 1.00
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Preliminary
HT16562
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, 86-755-8616-9308 Fax: 86-755-8616-9722 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 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.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
March 2007

display hour clock function Directly drive panels Duty cycle 4.194304M

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