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Figure 24 LC85632 Application Circuit

LC85632

No. 4659-33/34

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Summary of Contents for LC85632

Page 1: ...t failures that result from using products at values that exceed even momentarily rated values such as maximum ratings operating condition ranges or other parameters listed in products specifications of any and all SANYO products described or contained herein Overview The LC85632 is a multi function digital clock IC that in addition to providing current time display supports a wide range of functi...

Page 2: ...LC85632 No 4659 2 34 Pin Assignment ...

Page 3: ...UT Alarm B The output waveform is shown below During normal operation these pins output a low level high impedance Normal breakdown voltage Continued on next page LC85632 No 4659 3 34 No Pin Drive phase 1 Drive phase 2 1 AM PM AM PM 2 10 SHR ag d 10 SHR ad 10 SHR g 3 10 SHRb e 10 SHR e 10 SHR b 4 10 SHRc HRe HR e 10 SHR c 5 HRb g HR g HR b 6 HRc d HR d HR c 7 HRa f HR f HR a 8 10 SMIN a f 10 SMIN ...

Page 4: ...is not displayed but rather a snooze operation is started 25 ALM A B DISP SEL 3I Input pin for switching between alarm mode and current Open time mode Normally left open When a high level is applied the current time setting for alarm A is displayed and when a low level is applied the current time setting for alarm B is displayed In either case the time setting and the operation enable disable stat...

Page 5: ...rrent time setting disabled Low Dimmed display current time setting disabled 19 CR OSC I O Connection pin for external RC circuit Connected to VDD An oscillator circuit with a frequency of 4800 Hz can be formed using the following R and C values R 68 kΩ C 4700 pF 17 VSS I Power supply pins 30 VDD I VSS 0 V VDD 5 V standard 18 TEST 3I LSI test pin Open Normally left open 27 50 60 Hz INPUT I Input p...

Page 6: ... M Current time display NOP L Dimmed display NOP CAL DISP SNOOZE Input level Mode H Calendar display day month calendar setting snooze on M Current time display NOP L Calendar display month day calendar setting snooze on ALM A B DISP SEL Input level Mode H Alarm A setting display setting M Current time display NOP L Alarm B setting display setting MANUAL SLEEP Input level Mode H ON input sleep in ...

Page 7: ...cording to the 50 or 60 Hz frequency Maximum power dissipation Pdmax Ta 30 to 70 C 700 mW Ambient temperature operating Topr 30 to 70 C Ambient temperature storage Tstg 55 to 125 C Allowable Operating Ranges at Ta 30 to 70 C VSS 0 V Ratings Parameter Symbol Applicable pin Conditions min typ max Unit Operating power supply voltage VDD 4 0 5 0 6 0 V Input high level voltage VIH 1 CR OSC 0 75 VDD VDD...

Page 8: ... MODE SELECT RT TIME SET DIMMER TEST Pull up resistance RPU TIME SET INPUT VIN 1 2 VDD 1 0 MΩ CAL DISP SNOOZE ALM A B DISP SEL Pull down resistance RPD MANUAL SLEEP 0 8 MΩ MODE SELECT RT TIME SET DIMMER TEST Oscillator stability fS CR OSC Note 2 VDD 5 0 V 10 10 Oscillator precision fA CR OSC Note 2 VDD 5 0 V 10 10 Oscillator frequency fOSC CR OSC R 91 kΩ 1 4800 Hz C 3300 pF 5 Initial reset power s...

Page 9: ...e between the drive phases and the segments that light Note that figure 1 is a generalized LED panel and not an exact representation of any particular product Figure 1 LED Panel and LED Segments Table 1 Segment Lighting Correspondences for the Drive Phases No Pin Drive phase 1 Drive phase 2 1 AM PM AM PM 2 10 SHRag d 10 SHR ad 10 SHR g 3 10 SHRb e 10 SHR e 10 SHR b 4 10 SHRc HRe HR e 10 SHR c 5 HR...

Page 10: ... LEDs are lit for each drive phase This figure is based on the generalized drawing shown in figure 1 and the shaded sections show the segments that are lit by the corresponding phase Figure 2 LED Sections Lit by the Drive Phases No 4659 10 34 ...

Page 11: ...tori Sanyo Ltd SL 1042 30T LED panel However since the SL 1042 30T LED panel does not have an alarm A display LED an external LED is used for alarm A display Also the calendar day month display cannot be used with this circuit Figure 3 LED Panel Wiring Examples LC85632 No 4659 11 34 ...

Page 12: ...1994 54T for 12 hour display and the SL 1994 55T for 24 hour display and are both made by Tottori Sanyo Ltd The calendar day month cannot be used with this circuit Figure 4 Wiring and Connection Example Using the SL 1994 54T LED Panel 12 hour display Figure 5 Wiring and Connection Example Using the SL 1994 55T LED Panel 24 hour display No 4659 12 34 ...

Page 13: ... this case the IC will not detect power loss Also the alarm function will not operate correctly but will output either no signal or an irregular signal Furthermore no segment signals will be output in dimmer mode Note that if an oscillator circuit is not used the high level applied to the CR OSC pin must be applied before power is applied If the oscillator is forcibly stopped by applying a high le...

Page 14: ...LC85632 Operating State Transition Diagram Figure 6 Operating State Transitions 1 Overall No 4659 14 34 ...

Page 15: ...ALM IND AM PM ALARM SLEEP SNOOZE Operation Note The indicators for enabled alarms are lit Display Current time Colon ALM IND AM PM ALARM SLEEP SNOOZE Operation Note Depends on the display mode No change No change No change When alarm operation is not enabled When alarm operation is enabled Linked to the and inputs Linked to the and inputs Flashing Lit for enabled alarms Current time setting mode S...

Page 16: ... thus selecting the alarm display and setting mode Clearing alarm display and setting mode Making the ALM A B DISP SEL pin open Operation enabled Depends on the display mode State Display Alarm time setting Alarm Set time display Flashing Either A or B flashing Numbers Colon ALM IND AM PM ALARM SLEEP SNOOZE Operation Note Operation enabled Depends on the display mode Alarm setting time display Sta...

Page 17: ... displaying the calendar Application of a high or low level to the CAL DISP SNOOZE pin in a state in which no alarm signal is being output Display Calendar Colon ALM IND AM PM ALARM SLEEP SNOOZE Operation Note Linked to the and inputs Off Enabled alarms lit Off Normal clock No change No change No change Calendar setting State Numbers When backing up the calendar the date display changes from 3 1 t...

Page 18: ... input Was there an ON input Restore the display to normal display Set the RADIO OUTPUT pin to the low level Have 2 seconds passed since the input Was there an ON input To A A State Display ON state On display Off Enabled alarms lit Off ON operation No change Numbers Colon ALM IND AM PM ALARM SLEEP SNOOZE Operation Note The RADIO OUTPUT pin is set to the high level State Display Sleep set Set tie ...

Page 19: ...f Here the application of an input to the TIME SET INPUT input in the figure when the numbers are lit i e the timing indicated by A will be invalid Since the colon is off at that point the flashing state will not be cleared However such an input is valid at a point when the numbers are off i e the timing indicated by B Since the colon will be lit in this state the flashing state will be cleared an...

Page 20: ...ced by one minute Inversely if a low level is applied the second counter is reset to zero and the time is backed up by one minute In either case clock operation is interrupted at the point that the input is applied to the TIME SET INPUT pin Furthermore if the input is held for over 0 5 to 1 0 seconds the IC switches to quick forward or quick reverse mode In these modes counting speed will be 20 ms...

Page 21: ...ll start if the set time and the current time match during alarm setting 3 Enabling and disabling alarms Use the following methods to enable and disable the alarms Enabling an alarm At the point that the set time for the alarm to be operated is displayed that alarm is enabled and the alarm indicator ALM INDICATOR for that alarm is displayed Disabling an alarm When an alarms time setting is display...

Page 22: ... by 3 minutes to be between 3 and 4 minutes 7 Output The alarm A and B outputs have the following form Figure 12 Alarm Output Waveforms However if no oscillator circuit is attached at the CR OSC pin pin 19 the output will be a DC signal unmodulated by any tone Note that if an oscillator circuit is not used the high level applied to the CR OSC pin must be applied before power is applied If the osci...

Page 23: ...alarms are set to the same time alarm A takes priority and alarm B does not operate If the other alarm operates during a snooze interruption of one alarm the interrupted alarm is stopped Example Assume alarm A has been interrupted by the snooze function and alarm B operates At this point only the ALM B OUTPUT pin outputs an alarm signal and no signal is output from the ALM A OUTPUT pin when the sn...

Page 24: ...display Day month display Snooze in Snooze in When a high level is applied to the CAL DISP SNOOZE pin pin 21 the calendar is displayed in the day month format and when a low level is applied it is displayed in the month day format The calendar is set using either a high level or a low level input to the TIME SET INPUT pin pin 20 while the calendar is displayed 3 Operation Display The calendar is d...

Page 25: ...dar display the date is advanced by one day and if a low level is applied it is set back by one day In either case if the input is applied for more than 0 5 to 1 0 seconds the setting changes at a speed of 20 msec per increment when 60 Hz is input to the 50 60 Hz INPUT pin and at 17 msec per increment for a 50 Hz input Only the day can be changed directly using the TIME SET INPUT pin To change the...

Page 26: ...in output is made active i e the pin 22 output goes to the high level Any alarm operation either in progress or interrupted by the snooze function is stopped On is displayed in the LEDs Figure 17 Radio Output On Display At the same time the sleep counter is reset to 90 minutes and the sleep counter begins to count The On display is displayed for 1 or 2 seconds following the ON input and then the d...

Page 27: ...oze input the application of a high or low level to the CAL DISP SNOOZE pin occurs during sleep operation sleep operation is terminated and the RADIO OUTPUT pin pin 22 is turned off i e set to a low level output During display of the On 90 60 45 30 and 15 sleep displays only the alarm indicators for the enabled alarms are displayed and the colon and AM PM displays are turned off Figure 20 Sleep Se...

Page 28: ...PUT pin is set to a voltage close to the VDD voltage Since the display drive phase is generated from the AC waveform input to the 50 60 Hz INPUT pin it is important to input the AC waveform centered around the VDD voltage to prevent creating an unbalanced display duty Note that the overdrive portion of the input waveform that exceeds the VDD and VSS voltages indicated by a broken line in figure 22...

Page 29: ... the current time flashing at 1 Hz However alarm indicators for enabled alarms will be lit and not flashing Apply a high or low level to the TIME SET INPUT pin to stop the flashing and return to normal display Note that if the conditions for an alarm are fulfilled that alarm will be output even during a power outage If a backup oscillator is not connected to the CR OSC pin all operations will halt...

Page 30: ...gment CAL DISP SNOOZE Both 3 COLON RT TIME SET Low level AM PM ALM A ALM B Note 1 The LED segments are lit or turned off at the same time for all digits For example after setting the IC to LED test mode if a high level is applied to the TIME SET INPUT pin then all 4 a segments one LED in each 4 digits are turned off 2 Due to details of the output pins only the 10 SHR d segment is not linked to res...

Page 31: ...1 ALM A B DISP SEL pin 25 MANUAL SLEEP pin 26 RT TIME SET DIMMER pin 29 Current time display Sleep ON display Alarm setting time display calender and snooze displays Example If a high level is applied at the same time to both the ALM A B DISP SEL and the CAL DISP SNOOZE pins in current time display setting mode then the display will switch to calendar display LC85632 No 4659 31 34 ...

Page 32: ...LC85632 Figure 23 LC85632 Block Diagram No 4659 32 34 ...

Page 33: ...Figure 24 LC85632 Application Circuit LC85632 No 4659 33 34 ...

Page 34: ...r Such measures include but are not limited to protective circuits and error prevention circuits for safe design redundant design and structural design In the event that any or all SANYO products including technical data services described or contained herein are controlled under any of applicable local export control laws and regulations such products must not be exported without obtaining the ex...

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