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Ordering number : EN4659
CMOS IC
LC85632
Digital Alarm Clock
Overview
The LC85632 is a multi-function digital clock IC that in addition to providing current time display supports a wide range of functions, including an alarm function, a sleep function, a calendar function, and a function to turn connected equipment on and off. Furthermore, the LC85632 provides a simpler user interface than that of earlier Sanyo products.
Package Dimensions
unit: mm 3196-DIP30SD
[LC85632]
Applications
* Alarm clocks * Clock radios
Functions
* * * * Current time display Two independent alarm functions with snooze function Sleep timer function (up to 90 minutes) Calendar function One year calendar (January 1 to December 31) that can display leap year's day (February 29)
SANYO: DIP30SD
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment 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.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3098HA (OT)/71093JN B8-0531 No. 4659-1/34
LC85632
Pin Assignment
No. 4659-2/34
LC85632
Pin Functions
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 22 Pin AM & PM 10'SHRag & d 10'SHRb & e 10'SHRc & HRe HRb & g HRc & d HRa & f 10'SMIN a & f 10'SMIN b & g 10'SMIN c & d 10'SMINe & MINe MIN b & g MIN c & d MIN a & f COLON ALM INDICATOR RADIO OUTPUT I/O O O O O O O O O O O O O O O O O O VDD VDD Internal equivalent circuit LED output pins No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin AM & PM 10'SHR ag & d 10'SHRb & e 10'SHRc & HRe HRb & g HRc & d HRa & f 10'SMIN a & f 10'SMIN b & g 10'SMIN c & d 10'SMINe & MINe MIN b & g MIN c & d MIN a & f COLON ALM INDICATOR Drive phase 1 AM 10'SHR ad 10'SHR e HR e HR g HR d HR f 10'SMIN a 10'SMIN b 10'SMIN c MIN e MIN g MIN d MIN f COLON ALM-A Drive phase 2 PM 10'SHR g 10'SHR b 10'SHR c HR b HR c HR a 10'SMIN f 10'SMIN g 10'SMIN d 10'SMIN e MIN b MIN c MIN a -- ALM-B Pin function Handling when unused Open
(VDD - 15 V breakdown voltage) Outputs a DC voltage. This pin is controlled by the inputs to the MANUAL & SLEEP pin (pin 26). It operates as a toggle. During normal operation it outputs a low level (high impedance). MANUAL & SLEEP pin input level VDD OPEN VSS RADIO OUT pin output level (when pulled down to VSS) VDD VSS (Normal breakdown voltage) Open
23 24
ALM-A OUTPUT ALM-B OUTPUT
O O VDD
Output alarm signals ALM-A OUTPUT: Alarm A ALM-B OUTPUT: Alarm B The output waveform is shown below. During normal operation these pins output a low level (high impedance). ALM-A OUTPUT and ALM-B OUTPUT pin output levels (summary diagram) * ALM-A OUTPUT (2400 Hz) VDD VSS * ALM-B OUTPUT (1200 Hz) VDD VSS Output start (Normal breakdown voltage)
Open
Continued on next page.
No. 4659-3/34
LC85632
Continued from preceding page.
No. 20 Pin TIME SET INPUT I/O 3I
VDD
Internal equivalent circuit
Pin function Input pin that starts the setting/update of the current time, the alarm time, or the calendar date. Normally left open (NOP).
Handling when unused Open
H
The application of a high level is taken as a + input, which increases the value of the setting, and a low is taken as a - input, which decreases the value of the setting.
L H: High threshold input L: Low threshold input
21
CAL DISP & SNOOZE
3I
VDD
Input pin for calendar display and snooze. Normally left open. When a high level is applied the calendar displays the day and month, and when a low level is applied the calendar displays the month and day.
H
Open
L H: High threshold input L: Low threshold input
However, if an alarm signal is being output from either ALM-A OUTPUT or ALM-B OUTPUT (pin 23 or 24) the calendar 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 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 state can be changed.
Open
26
MANUAL & SLEEP
3I
Input pin for setting the RADIO OUTPUT pin (pin 22) output control and the sleep function time. Normally left open. When a high level is applied the RADIO OUTPUT goes high. This pin can also be used for setting the sleep function time. When a low level is applied the RADIO OUTPUT goes low. When either a low level or a high level is applied, any alarm output in progress will be stopped.
Open
Continued on next page.
No. 4659-4/34
LC85632
Continued from preceding page.
No. 28 Pin MODE SELECT I/O 3I
VDD
Internal equivalent circuit
Pin function Input pin for switching the operating mode. Switches the display mode and the clock input to the 50/60 Hz INPUT pin (pin 27).
Handling when unused Either left open, connected to VDD, or connected to ground.
H
High: 50 Hz/24 hour display Open: 60 Hz/12 hour display Low: 50 Hz/12 hour display
L
29
RT-TIME SET/DIMMER
3I
H: High threshold input L: Low threshold input
Input pin for switching the enabled/disabled state for setting the time. Normally left open. High: Current time display/current time setting mode Open: Current time display/current time setting disabled Low: Dimmed display/current time setting disabled
Open
19
CR OSC
I/O
VDD
Connection pin for external RC circuit. An oscillator circuit with a frequency of 4800 Hz can be formed using the following R and C values. R = 68 k C = 4700 pF
Connected to VDD
17 30
VSS VDD
I I
External RC constant circuit
--
Power supply pins. VSS = 0 V VDD = +5 V (standard)
--
18
TEST
3I
VDD
LSI test pin. Normally left open.
Open
H
L H: High threshold input L: Low threshold input
27
50/60 Hz INPUT
I
Input pin for the 50/60 Hz input for the clock. (Schmitt input)
Note: * "3I" is an abbreviation for "three value input pin." The inputs to these pins can be either high, open, or low. These pins are left open during normal use. * NOP: "No operation"
No. 4659-5/34
LC85632
Three Value Input Circuits: H: High level, M: Open, L: Low level, NOP: No operation
* MODE SELECT
Input level H M L 50 Hz/24 hour display 60 Hz/12 hour display 50 Hz/12 hour display Mode
* TIME SET INPUT
Input level H M L Up NOP Down Mode
* RE-TIME SET/DIMMER
Input level H M L Mode Current time display/current time setting mode Current time display/NOP Dimmed display/NOP
* CAL DISP & SNOOZE
Input level H M L Mode Calendar display (day*month)/calendar setting/snooze on Current time display/NOP Calendar display (month*day)/calendar setting/snooze on
* ALM-A/B DISP & SEL
Input level H M L Alarm A setting display/setting Current time display/NOP Alarm B setting display/setting Mode
* MANUAL & SLEEP
Input level H M L ON input/sleep-in Current time display/NOP OFF input Mode
* TEST
Input level H M L Illegal setting Normal operation LED test Mode
No. 4659-6/34
LC85632
Specifications
Absolute Maximum Ratings at Ta = 25C, VSS = 0 V
Parameter Maximum power supply voltage Input voltage Symbol VDDmax VIN(1) VIN(2) All input pins other than the 50/60 Hz INPUT pin 50/60 Hz INPUT Pin voltage With a 100 k currentlimiting resistor inserted in the input, at that resistor's terminal. Input clamping current Output voltage Output voltage IIN VOUT(1) VOUT(2) 50/60 Hz INPUT CR OSC RADIO OUTPUT ALM-A OUTPUT ALM-B OUTPUT LED SEGMENT output pins (pins 1 to 16) Total for the LED SEGMENT output pins (pins 1 to 16) The average value of the effective current value within a single display cycle according to the 50 or 60 Hz frequency. Ta = -30 to +70C With a 100 k limiting resistor inserted in the input. Applicable pin Conditions Ratings -0.3 to +7.0 -0.3 to VDD + 0.3 -0.3 to VDD + 0.3 VDD - 12 to VDD + 12 Unit V V
-0.4 to +0.4 -0.3 to VDD + 0.3 -0.3 to VDD + 0.3
mA V V
Output voltage Total output current
VOUT(3) ILED
VDD - 15 to VDD + 0.3 -280 to 0
V mA
Maximum power dissipation Ambient temperature: operating Ambient temperature: storage
Pdmax Topr Tstg
700 -30 to +70 -55 to +125
mW C C
Allowable Operating Ranges at Ta = -30 to +70C, VSS = 0 V
Ratings Parameter Operating power supply voltage Input high level voltage Input low level voltage Input high level voltage Input intermediate level voltage Input low level voltage Input high level voltage Input low level voltage Operating frequency Input level hold time Input chattering time Symbol VDD VIH(1) VIL(1) VIH(2) VIM(2) VIL(2) VIH(3) VIL(3) fOP tH tC 50/60 Hz INPUT All three value input pins All three value input pins TIME SET INPUT CAL DISP & SNOOZE ALM-A/B DISP & SEL MANUAL & SLEEP MODE SELECT RT-TIME SET/DIMMER TEST 50/60 Hz INPUT The intermediate is the open pin state. The rated values apply when an external signal is applied. CR OSC Applicable pin Conditions min 4.0 0.75 VDD VSS VDD - 0.5 1/2 VDD - 0.5 VSS VDD - 0.5 VSS 1 10 10 typ 5.0 max 6.0 VDD 0.25 VDD VDD 1/2 VDD + 0.5 VSS + 0.5 VDD + 0.3 VDD - 3.0 2000 Unit V V V V V V V V Hz ms ms
No. 4659-7/34
LC85632
Electrical Characteristics at Ta = 25C, VDD = 5 V, VSS = 0 V
Ratings Parameter Output high level current Output off leakage current Output high level current Symbol IOH(1) IOF(1) IOH(2) AM & PM 10'SHRb & e 10'SHRc & HRe HRb & g HRc & d HRa & f 10'SMIN a & f 10'SMIN b & g 10'SMIN c & d 10'SMINe & MINe MIN b & g MIN c & d MIN a & f COLON ALM INDICATOR RADIO OUTPUT ALM-A OUTPUT ALM-B OUTPUT Applicable pin 10' SHRag & d Conditions Output on, VOUT = VDD - 2.0 V Output off, VOUT = VDD - 12 V Output on, VOUT = VDD - 2.0 V min (Note 1) -20 (Note 2) -16 typ max -32 Unit mA A mA
Output off leakage current Output high level current Output off leakage current Input high level current Input low level current Input high level current
IOF(2) IOH(3) IOF(3) IIH(2) IIL(2) IIH(3)
Output off, VOUT = VDD - 12 V Output on, VOUT = VDD - 2.0 V Output off, VOUT = VSS VIN = VDD VIN = VSS
-20 -2 -10 10 -2 10 100
A mA A A mA A
CR OSC
Input low level current
IIL(3)
TIME SET INPUT CAL DISP & SNOOZE ALM-A/B DISP & SEL MANUAL & SLEEP MODE SELECT RT-TIME SET/DIMMER TEST TIME SET INPUT CAL DISP & SNOOZE ALM-A/B DISP & SEL MANUAL & SLEEP MODE SELECT RT-TIME SET/DIMMER TEST CR OSC (Note 2) CR OSC (Note 2) CR OSC VDD VSS
VIN = VDD
VIN = VSS
-100
-10
A
Pull-up resistance
RPU
VIN = 1/2 VDD
1.0
M
Pull-down resistance
RPD
0.8
M
Oscillator stability Oscillator precision Oscillator frequency Initial reset power supply voltage
fS fA fOSC VDET
VDD = 5.0 V VDD = 5.0 V R = 91 k 1% C = 3300 pF 5% Power supply voltage range when initial reset operates. With no output load
-10 -10 4800 2.5
+10 +10
% % Hz
4.0
V
Current dissipation (operating)
IDD
2
mA
Note: 1. In addition to not exceeding the total output current ILED (from the absolute maximum ratings table), the segment output currents are allowed the following values within a 700 mW total power dissipation range. 10'SHRag & d: Up to -78 mA Others: Up to -39 mA Current flowing out of the IC is expressed with negative values, and current flowing into the IC is expressed with positive values. 2. The total variation in the oscillator frequency will be the sum of the precision and the stability. That is, the limiting values for the oscillator frequency variation fall within the range from fosc - 19% to fosc + 21%.
No. 4659-8/34
LC85632
Functional Description
Segment Output This IC can directly drive with its 16 segment pins duplex type LED panels that include colon and alarm indicators. However, since the total value of the LED drive current (ILED) flowing into the LED panel is limited to its absolute maximum value, caution is required in design. Figure 1 shows the correspondence between the LC85632 segment outputs and the LED panel. For example, pin 2 (the 10'SHRag & d pin) drives the segments `a', `g', and `d' in the 10'SHR digit. Table 1 shows the correspondence 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. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 AM & PM 10'SHRag & d 10'SHRb & e 10'SHRc & HRe HRb & g HRc & d HRa & f 10'SMIN a & f 10'SMIN b & g 10'SMIN c & d 10'SMINe & MINe MIN b & g MIN c & d MIN a & f COLON ALM INDICATOR Pin AM 10'SHR ad 10'SHR e HR e HR g HR d HR f 10'SMIN a 10'SMIN b 10'SMIN c MIN e MIN g MIN d MIN f COLON ALM-A Drive phase 1 PM 10'SHR g 10'SHR b 10'SHR c HR b HR c HR a 10'SMIN f 10'SMIN g 10'SMIN d 10'SMIN e MIN b MIN c MIN a -- ALM-B Drive phase 2
No. 4659-9/34
LC85632 Figure 2 shows the sections where 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
LC85632 Figure 3 shows actual wiring examples for 12 hour and 24 hour displays for the Tottori 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
No. 4659-11/34
LC85632 The following figures show the circuit diagrams for LED panels that can also display the alarm and calendar functions. These panels are the SL-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
LC85632 Oscillator Circuit A 4800 Hz oscillator can be constructed by connecting a resistor and a capacitor to the CR OSC pin (pin 19). This oscillator is used as the internal clock for detecting the loss of external power, for alarm tones, and for the dimmer duty cycle. Therefore, it operates continuously during normal operation. In this section, we describe the operation when the AC input to the 50/60 Hz INPUT pin falls below 1 Hz. During a power outage, LED segment output from pins 1 to 16 is stopped. Also when power is restored and the AC input becomes over 1 Hz, the whole LED display (except for the alarm indicator) flashes. The period of this flashing is 1 Hz. This period is created by dividing the period of the AC input from the 50/60 Hz either by 50 when the clock is operated at 50 Hz, i.e., when either a low or high level is applied to the MODE SELECT pin, or by 60 when the clock is operated at 60 Hz, i.e., when the MODE SELECT pin is left open. Apply either a high level or a low level to the TIME SET INPUT pin to stop the flashing. In either case the flashing will stop and the chip will return to normal operation, i.e., current time display. Tie the CR OSC pin high if the oscillator circuit is not used. In 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 level in the state where the CR oscillator is operating after power has been applied the alarm DC output may operate incorrectly. Dual Alarms This IC provides two 24-hour alarms systems, each of which can be set in 1 minute increments. Alarm A outputs a 2400 Hz alarm tone, and alarm B a 1200 Hz tone. (See the "Alarm" section for details on the alarm waveforms.) The alarm tones are output continuously for 59 minutes, but can be interrupted for 6 to 7 minutes by the snooze function. Calendar This IC includes an on-chip full-year month and day display calendar function. The display can be switched to be either a month/day or a day/month format. The calendar function can be set to display leap year's day (February 29) on what would have been March 1 by applying a low level to the TIME SET INPUT pin. Sleep Function This IC includes a 90 minute sleep circuit (off timer) that can be set easily. The sleep function time setting can be set to be 90, 60 , 45, 30, or 15 minutes in an "easy set" format.
No. 4659-13/34
LC85632
Operating State Transition Diagram
Figure 6 Operating State Transitions 1: Overall
No. 4659-14/34
LC85632
Power on
To the alarm display and setting block
Application of a high or low level to the ALM-A/B DISP & SEL pin.
Initial state x Current time, flashing 12 00 (Phase x) : (Phase y) -- Depends on the display mode Operation Normal clock ALARM Not set SLEEP Not set SNOOZE Not set Note: The clock operates even in this state. State Display Numbers Colon ALM IND AM/PM
Application of a high level to the RT-TIME SET/DIMMER pin.
Application of a high or low level to the TIME SET INPUT pin. State Display Numbers Colon ALM IND AM/PM Normal display Current time Current time Lit -- Depends on the display mode Operation Normal clock ALARM No change SLEEP No change SNOOZE No change Note: The TIME SET INPUT is a NOP in this mode.
State
To the calendar and snooze block
Application of a high level to the RT-TIME SET/ DIMMER pin.
Application of a high or low level to the CAL DISP & SNOOZE pin.
Making the RT-TIME SET/ DIMMER pin open.
Current time setting mode Current time Linked to the + and - inputs Colon Flashing ALM IND Lit for enabled alarms Depends on the AM/PM display mode Linked to the + and Operation - inputs ALARM No change SLEEP No change SNOOZE No change Note: Display Numbers
When alarm operation is not enabled
To the manual and sleep block
Application of a high or low level to the MANUAL & SLEEP pin.
State Display Numbers Colon ALM IND AM/PM Operation ALARM SLEEP SNOOZE
Normal state Current time Current time Lit Lit* -- Normal clock Set Not set Not set Note: * The indicators for enabled alarms are lit.
State
Application of a high level to the RT-TIME SET/ DIMMER pin.
Making the RT-TIME SET/ DIMMER pin open.
Current time setting mode Display Current time Numbers Linked to the + and - inputs Colon Flashing ALM IND Lit for enabled alarms Depends on the AM/PM display mode Operation Linked to the + and - inputs ALARM No change SLEEP No change SNOOZE No change Note: Alarm operation starts at the point the time matches an alarm setting time.
When alarm operation is enabled Note: The "Display" sections indicates the states of the LED display. Abbreviations: ALM IND. Alarm indicator, AM/PM AM, PM Figure 7 Operating State Transitions 2: Current Time Display and Setting Block
No. 4659-15/34
LC85632 From initial state x
Application of a high or low level to the ALM-A/B DISP & SEL pin, thus selecting the alarm display and setting mode. Initial state y Alarm 12 00 Flashing Either A or B flashing Depends on the display mode
State Display Numbers Colon ALM IND AM/PM
From the current time display and setting block
Operation ALARM Operation enabled SLEEP -- SNOOZE -- Note: If the current time display is flashing, that flashing is stopped.
Application of a high or low level to the TIME SET INPUT pin.
Application of a high or low level to the ALM-A/B DISP & SEL pin, thus selecting the alarm display and setting mode.
State Display Numbers Colon ALM IND AM/PM
Alarm time setting Alarm Set time display Flashing Either A or B flashing Depends on the display mode Alarm setting time Operation display ALARM Operation enabled SLEEP -- SNOOZE -- Note:
State Display Numbers Application of a high or low level to the TIME SET INPUT pin.
Making the TIME SET INPUT pin open.
Alarm time setting Alarm Linked to the + and - inputs Colon Flashing ALM IND Either A or B flashing Depends on the AM/PM display mode Operation Linked to the + and - inputs ALARM Operation enabled SLEEP -- SNOOZE -- Note: Alarm output starts if the current time matches the setting time.
To the current time display and setting block
Application of a low level to the MANUAL/ SLEEP pin. State Display Numbers Colon ALM IND AM/PM Alarm operation disable Alarm Set time display Flashing Enabled alarm flashing Depends on the display mode Alarm setting time Operation display ALARM Operation enabled SLEEP -- SNOOZE -- Note: In the alarm not set mode, the alarm will not operate even if the set time is the same as the current time.
Clearing alarm display and setting mode. (Making the ALM-A/B DISP & SEL pin open.)
The following are the alarm stop conditions during output. * An OFF input (pin 22 = VSS) * An ON input (pin 22 = VDD) * Arrival at the point 59 minutes following start of alarm output. * A snooze input (pin 21 = VDD or VSS) (Alarm output restarts after the completion of the snooze operation.) * The start of another alarm operation during alarm operation. Figure 8 Operating State Transitions 3: Alarm Display and Setting Block
No. 4659-16/34
LC85632 From initial state x
Application of a high or low level to the CAL DISP & SNOOZE pin in the initial state (1) state, thus displaying the calendar. State Display Numbers Colon ALM IND AM/PM Operation ALARM SLEEP SNOOZE Note: Initial state z Calendar 11 Off Enabled alarms lit Off Normal clock No change No change No change Application of a high or low level to the TIME SET INPUT pin.
From the current time display and setting block To the current time display and setting block
Application of a high or low level to the CAL DISP & SNOOZE pin in a state in which no alarm signal is being output.
Making the CAL DISP & SNOOZE pin open.
State Display Numbers Colon ALM IND AM/PM Operation ALARM SLEEP SNOOZE Note:
Calendar display Calendar Current date Off Enabled alarms lit Off Normal clock No change No change No change
State Display Numbers Application of a high or low level to the TIME SET INPUT pin.
Making the TIME SET INPUT pin open.
Calendar setting Calendar Linked to the + and - inputs. Colon Off ALM IND Enabled alarms lit AM/PM Off Operation Normal clock ALARM No change SLEEP No change SNOOZE No change Note: When backing up the calendar the date (display) changes from 3/1 to 2/29, and then to 2/28.
Figure 9 Operating State Transitions 4: Calendar Display and Setting Block
No. 4659-17/34
LC85632
Current time display and setting block (From initial state x)
Was there an ON input?
No
To the current time display and setting block
*A
Yes Start the sleep count Turn on the display and set the RADIO OUTPUT pin high.
Have 2 seconds passed since the input?
Yes
ON state
No
Reset the sleep count to 60 minutes.
Reset the sleep count to 30 minutes.
No
Was there an ON input? Yes Reset the sleep count to 90 minutes.
Have 2 seconds passed since the input? No
Yes
Have 2 seconds passed since the input? No
Yes
Sleep setting
No Have 2 seconds passed since the input? No Yes
Was there an ON input? Yes Reset the sleep count to 45 minutes.
No
Was there an ON input? Yes Reset the sleep count to 15 minutes.
No
Was there an ON input? Yes
Have 2 seconds passed since the input? No
Yes
Have 2 seconds passed since the input? No
Yes
No
Was there an ON input? Yes
No
Was there an ON input? Yes
State ON state Display "On" display Numbers -- Colon Off ALM IND Enabled alarms lit AM/PM Off Operation ON operation ALARM No change SLEEP -- SNOOZE -- Note: The RADIO OUTPUT pin is set to the high level.
State Sleep set Display Set tie display Numbers Sleep setting time Colon Off ALM IND Enabled alarms lit AM/PM Off Operation Linked to "ON" inputs ALARM No change SLEEP Count starts SNOOZE -- Note: The sleep setting time is changed according to "ON" inputs.
Restore the display to normal display. Set the RADIO OUTPUT pin to the low level.
Have 2 seconds passed since the input? No
Yes
No
Was there an ON input? Yes
* To A
* "ON input": The application of a high level to the MANUAL & SLEEP pin. * When the RADIO OUTPUT pin output is at the high level, the OFF input (application of a low level to the MANUAL & SLEEP pin) will always be valid. (If the RADIO OUTPUT pin is at the low level, the sleep counter will be reset and the count stopped.)
Figure 10 Operating State Transitions 5: Manual and Sleep Block
No. 4659-18/34
LC85632
Operation
Clearing the Initial Reset State In the initial state when power is first applied, the display reads 12:00 (or 0:00 for 24 hour display) and the numbers and the colon flash alternately. This is called the "initial reset state". The period of the flashing is 1 Hz. To clear the flashing state, apply a high or low level to the TIME SET INPUT pin when the colon is lit.
Figure 11 Clearing the Initial Input State Flashing In figure 11, the shaded areas under the LED display line are times when the numbers are lit. At these times the colon will be off. Here, the application of an input to the TIME SET INPUT input x 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 and the clock will enter normal display mode. Alternatively, an input signal such as the TIME SET INPUT input y in the figure can be applied. Here, the low (or high) level is held until the flashing is cleared at the timing indicated by "D" in the figure. When the flashing state is cleared, the colon also will stop flashing, and remain lit.
No. 4659-19/34
LC85632 Setting the Time * RT-TIME SET/DIMMER [Pin 29]
VSS DIMMER (1/4 DUTY) OPEN NOP (Current time display) VDD Current time setting mode
* TIME SET INPUT [Pin 20]
VSS DOWN (Back) OPEN NOP (Current time display) UP (Forward) VDD
(1) Normal operation (current time display mode) RT-TIME SET/DIMMER pin: Open TIME SET INPUT pin: Open In this state the current time is displayed and inputs to the TIME SET INPUT pin (pin 20) for setting the time will be ignored. (2) Current time setting mode The IC can be switched to the current time setting mode by applying a high level to the RT-TIME SET/DIMMER pin (pin 29). The current time can only be changed in this mode, and is changed by inputs to the TIME SET INPUT pin (pin 20). The current time setting mode and the current time display mode can be distinguished by the state of the colon. If the colon is lit steadily then the IC is in display mode, and if the colon is flashing with a 1 Hz period then the IC is in setting mode. Normally, the clock continues to operate in setting mode. If a high level is applied to the TIME SET INPUT pin in setting mode, the second counter is reset to zero and the time is advanced 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 msec/count for a 50 Hz input to the 50/60 Hz INPUT pin, and 17 msec/count for a 60 Hz input to that pin. When the time has been set, normal clock operation can be restarted by making the TIME SET INPUT pin open. (3) Dimmer display RT-TIME SET/DIMMER pin: Low level If an RC circuit is connected to the CR OSC pin (pin 19) this input can be used to set the LED lit time to 1/4 of that in normal operation, thus reducing the effective LED brightness. This sets the LED display to a 1/4 duty cycle. In this mode, the LED on time will 1/4 of that in normal operation, with no influence on any other operation. If an RC circuit is not provided the LED output will go to zero, i.e., this input can be used to turn off LED display. This operation is a toggle operation. The first time a low level is applied to the RT-TIME SET/DIMMER pin dimmed display is setup, and the next time a low level is applied the display will return to normal.
No. 4659-20/34
LC85632 Alarm * ALM-A/B DISP & SEL. [Pin 25]
VSS Alarm B set time display (Setting enabled) OPEN NOP (Current time display) VDD Alarm A set time display (Setting enabled)
(1) Entering alarm mode Alarm A set time display (setting enabled): High level Alarm B set time display (setting enabled): Low level This pin should be left open in normal operation. Applying a high or low level to this pin displays the set time for alarm A (high level) or alarm B (low level) and enables the alarm time to be set. The display switches to set time display (with an initial value of 12:00 or 0:00) and the colon and the corresponding alarm indicator (ALM INDICATOR) flash in synchronization. (2) Adjusting the set time The alarm time settings are adjusted by displaying the alarm whose setting is to be changed, and then inputting a high or low level to the TIME SET INPUT pin (pin 20). We will refer to these latter operations as "+ input" and "- input" in the remainder of this section. The initial value of the display will be 12:00 (or 0:00) unless there was a previous setting, in which case that value is displayed. The alarms are set in 1 minute increments, and the setting is changed by one minute each time a + input or a - input is applied. Furthermore, if the + or - 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. Note that alarm output will 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 displayed, that alarm can be disabled by applying a low level to the MANUAL pin. At this point the colon will blink continuously and the alarm indicator for the corresponding alarm will go out. Note that the set time is maintained, i.e., is not reset. (4) Alarm operating conditions The alarm operates under either of the following conditions: * If the alarm set time and the current time agree when alarm operation is enabled. * If the alarm set time and the current time agree while setting the alarm time, i.e., while advancing or backing up the alarm time setting. (5) Alarm operation termination conditions Alarm output stops if any of the following conditions are met. * If a high or low level is applied to the MANUAL & SLEEP pin (pin 26). * If there was a snooze input, i.e., if either a high or low level was applied to the CAL DISP & SNOOZE pin). Note that alarm output will resume once the snooze setting period has elapsed. * If a total time of 59 minutes (excluding the snooze interrupt periods) has passed since the start of the alarm output. * If the other alarm starts operation during alarm output. (See item (7), "Output.") * If the other alarm starts operation during an interruption of alarm output due to the snooze function. (See item (7), "Output.")
No. 4659-21/34
LC85632 (6) Restart of and alarm interrupted by the snooze function * A snooze operation completes 6 to 7 minutes after its start. * If the current time is changed during a snooze operation, the snooze period will be shortened by the amount the time is changed, regardless of whether the time was advanced or moved backwards. For example, if directly following the start of a snooze operation the current time is set back by 3 minutes, the alarm interruption period due to the snooze function will be reduced 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 oscillator is forcibly stopped by applying a high level in the state where the CR oscillator is operating after power has been applied the alarm DC output may operate incorrectly.
Figure 13 Alarm Output Waveform Overview (for the case where the output is a DC signal unmodulated by any tone)
No. 4659-22/34
LC85632 * The conditions concerning alarm output are as follows: -- In principle, the later occurring alarm is given priority. Example: The alarms will operate as follows if alarm A is set for 12:02 and alarm B is set for 12:04. * Alarm A begins to operate at 12:02 * At 12:04 alarm B begins to operate. At the same time alarm A stops.
Figure 14 Alarm Operation Priority Exceptions to later arrival priority: Although in principle the later occurring alarm take priority, in the following case alarm A takes priority and alarm B does not operate. Assume that the alarm A set time is 12:30 and the alarm B set time is 12:00 and the alarms are enabled at 12:15. Now, time progress and 12:30 arrives and alarm B operates. At this point, while the current time is still 12:30, alarm B will not operate even if the alarm B set time is advanced to 12:30. Here, alarm A will take priority and alarm B will not operate. -- If both 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 snooze period for alarm A completes. (8) Other points * Notes on the alarm indicators (ALM INDICATOR) This output is used to display the alarm state on the LED display. Its display states are as follows. -- -- -- -- -- Normal operation (No alarm times set and no operations enabled) : Normal operation (Alarm time set and alarm enabled) : Alarm setting mode : Initial state flashing mode : Flashing mode following a power loss : Off On Flashing (1 Hz) Lit (not flashing) Lit (not flashing)
Figure 15 Alarm Indicators * Radio output If the radio output is in the on state, i.e., the RADIO OUTPUT pin is high, and either alarm A or alarm B output goes on, the radio output will go off, i.e., the RADIO OUTPUT pin will go low.
No. 4659-23/34
LC85632 Calendar (1) Overview This IC includes a one year calendar on-chip. It only supports month and date displays, and does not provide a day of the week display. The following calendar table is included on-chip.
Month Days 1 31 2 28 3 31 4 30 5 31 6 30 7 31 8 31 9 30 10 31 11 30 12 31
This calendar function can display February 29 to handle leap year's day. * During calendar display the AM/PM indicator and the colon are turned off. * Alarm indicators for enabled alarms (ALM INDICATOR) are lit. * The display format can be switched to be either month-day or day-month. (2) Functions * CAL. DISP & SNOOZE [Pin 21]
VSS Calendar display and set (Month-day display) Snooze-in OPEN NOP (Current time display) VDD Calendar display and set (Day-month display) 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 displayed when either a high or a low level is applied to the CAL DISP & SNOOZE pin (pin 21). Only numbers and the alarm indicators for alarms that are enabled are displayed; the other segments (AM/PM and the colon) are turned off.
However, note that the CAL DISP & SNOOZE pin operates as snooze function input during alarm signal output and periods when the alarm output is interrupted by the snooze function. During those times the calender is not displayed.
Figure 16 Calendar Display Setting
No. 4659-24/34
LC85632 * Operating conditions -- Normal operation When the time advances from 23:59 to 0:00 (0:00 a.m.), the date is advanced by 1 day. -- Current time setting mode The clock time setting is advanced or set back in current time setting mode. If the time setting passes through 0:00 a.m. during that operation, the calendar is advanced or set back by one day. -- During calendar display If a high level is applied to the TIME SET INPUT pin during calendar display, the date is advanced by one day, and if a low level is applied, it is set back by one day. * Setting -- The calendar can be set during calendar display The calendar display following initial reset, i.e., the initial value, will be January 1. the TIME SET INPUT pin is used for setting the date. If a high level is applied to the TIME SET INPUT pin during calendar 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 month, count either up or down through the days of the month. For example, 1/30 1/31 2/1, or 2/2 2/1 1/31. -- Displaying leap year's day (2/29) To display leap year's day, with the calender display set to 3/1, apply a low level to the TIME SET INPUT pin for more than 20 msec and less than 0.5 seconds, i.e., back up the date one day. In normal operation, the date advances from 2/28 to 3/1, but in date backup, the date changes from 3/1 to 2/29 and then to 2/28. 2/27 2/28 3/1 3/2..... : Normal calendar display 3/2 3/1 2/29 2/28... : Display when setting the calendar in the reverse direction
No. 4659-25/34
LC85632 Manual and Sleep * MANUAL & SLEEP [Pin 26]
VSS OFF input OPEN NOP (Current time display) ON input Sleep-in VDD
(1) Function This pin has the following functions. * RADIO OUTPUT pin (pin 22) output control * Alarm output stop control * Sleep operation setting (including setting the operating time) (2) Operation * RADIO OUTPUT pin output control The output of the RADIO OUTPUT pin can be controlled by applying a high or low level to the MANUAL & SLEEP pin. The operations of applying a high or low level to this pin for over 20 msec and under 0.5 seconds are abbreviated as "an ON input" and "an OFF input" in the remainder of this section. The operations performed on an ON input are as follows: -- The RADIO OUTPUT pin 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 display returns to current time display. Example: If an ON input occurs in the interval A in figure 18, then the display returns to current time display at point B. (Shaded section: "On" display)
Figure 18 "On" Display Timing The operations performed on an ON input are as follows: -- Any alarm operation in progress is stopped. -- The RADIO OUTPUT pin output is set to the low level (high impedance). -- The LED display is restored to current time display. -- The sleep counter is reset to 90 minutes, and the count operation is stopped.
No. 4659-26/34
LC85632 * If another ON input is applied during "On" display, the IC enters sleep mode. The following operations are performed in sleep mode. -- The display is changed from "On" to "90".
Figure 19 Sleep Setting Time Display -- The display is held in that form for a 1 to 2 second period, and if another ON input is applied during this display, the display changes to 60. Thereafter, each display is held for 1 to 2 seconds, and if another ON input is applied, the display changes from "60" to "45" to "15" to the current time display, and then to "On" again. If no ON input is applied during one of these 1 to 2 second waiting periods, the display returns to current time display and the sleep counter is started. However, note that when the sleep display changes from "15" to current time display, the RADIO OUTPUT pin (pin 22) output goes off, i.e., to a low level output. -- If a snooze 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 Setting Timing * If the current time is changed (set) after setting the sleep interval, the length of the set sleep interval up to the point the radio goes off may change. Therefore, if the current time is changed (set) after setting the sleep interval it will be necessary to reset the desired sleep interval. Example: Set the sleep interval to 60 minutes. Then, either quick advance or quick return the current time by 25 minutes using the current time setting mode. At this point, the sleep counter will have been advanced by the amount the current time was advanced or set back, and the actual sleep time will be 35 minutes.
No. 4659-27/34
LC85632 AC Input * 50/60 Hz INPUT [Pin 27]
Input AC input (f = 50 Hz/60 Hz)
(1) The AC input should be 50 or 60 Hz. This input uses the 50/60 Hz INPUT pin. This input is used as the reference clock during normal operation. (2) AC input to the 50/60 Hz INPUT pin We recommend the circuit shown as an example in figure 21. Figure 22 shows the input waveform when this circuit is used. The input threshold voltage for the 50/60 Hz INPUT 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) is clipped by clamping diodes built into the 50/60 Hz INPUT pin, and the actual waveform becomes that shown in figure 22.
Figure 21 Recommended Circuit for AC Waveform Input
Figure 22 AC Input Waveform
No. 4659-28/34
LC85632 (3) The IC determines whether power has been lost based on whether there is an AC input to the 50/60 Hz INPUT pin. * Determining that power has been lost When the AC input falls under 1 Hz, the IC determines that power has been lost and stops display output. However, this determination is performed by comparing that input with the frequency from the RC oscillator on the CR OSC pin. If the CR OSC pin is not used, the IC will not check for power outages. Note that a high level should be applied to the CR OSC pin if it is not used. * Power outage operation If a backup oscillator is connected to the CR OSC pin, at the point that a power outage is detected LED segment output and RADIO OUTPUT pin output are stopped. Also, if an alarm has been interrupted by the snooze function, the snooze function is cleared and the alarm output restarted. At this point the clock operation will continue using the backup oscillator. During a power outage, only the OFF input (a low level to the MANUAL & SLEEP pin) is valid, and all other operation inputs are disabled. During the backup state following a power outage detection, at the point that the AC input is restored to a frequency over 1 Hz the IC switches from operation based on the RC oscillator to operation based on AC input. The display indicates a power outage by displaying 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. That is, power outage detection and backup operation are not performed. Also, the following operations will be performed after recovery from a power outage. -- If the rated power supply voltage (4.0 to 6.0 V) was maintained: Clock operation restarts from the point power was lost. -- If the power supply voltage fell below the rated voltage: The IC returns to the initial start state. * Current time during a power outage The current time is maintained during a power outage using a clock signal generated by dividing the oscillation frequency of the RC oscillator circuit. The standard oscillation frequency of the RC oscillator circuit is 4800 Hz. When the mode is set to 50 Hz mode, the 4800 Hz signal is divided by 96 to form a 50 Hz signal, and when set to 60 Hz mode, the 4800 Hz signal is divided by 80 to form a 60 Hz signal. Colon (1) Remains lit during normal operation. (2) Flashes at 1 Hz following a initial reset, following recovery from a power outage, and during time setting modes for the current time, alarm A, and alarm B. (3) Turns off during calendar display and the "On" and sleep time displays.
No. 4659-29/34
LC85632 Self Test Mode * TEST [Pin 18]
VSS LED self test mode Normal operation OPEN VDD IC test, illegal setting
This IC provides a self-test mode for testing the LED display and the three value input pins. It supports the following tests. The LEDs can be tested for failure to light and for unbalanced intensity. This test mode is entered when a low level is applied to the TEST pin (pin 18), and all LED segments are lit. In this state, the LED segments can be turned off individually by applying high or low levels to the three value input pins. The correspondence between the applied inputs and the segments that are turned off is shown in the table below.
Input pin RT-TIME SET TIME SET INPUT TIME SET INPUT ALM-A/B DISP & SEL ALM-A/B DISP & SEL MANUAL & SLEEP MANUAL & SLEEP CAL DISP & SNOOZE RT-TIME SET High level High level Low level High level Low level High level Low level Both*3 Low level Input level Corresponding LED segment*1 a segment*2 b segment c segment d segment*2 e segment f segment g segment COLON 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 rest of the d segment, but is turned off an on along with the a segment. 3. Operates identically for both high and low level signals. 4. Since the operations in the above table are toggle operations, repeated application of signals to the three value inputs will repeatedly turn each segment on and off. 5. When the IC is in the LED test mode, the MODE SELECT pin must be held at either the high, open, or low level. Operation of the IC is not guaranteed if the signal on the MODE SELECT pin changes while the IC is in the LED test mode. 6. The TEST pin must be left open during normal operation. 7. Do not change the setting on the MODE SELECT pin (pin 28) when the IC in self test mode. System operation is not guaranteed if this setting is changed.
No. 4659-30/34
LC85632 Display Priority Ordering The priority order for display when inputs are applied to two or more of the following pins at the same time is shown in the box below. * CAL DISP & SNOOZE (pin 21) * 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.
No. 4659-31/34
LC85632
Figure 23 LC85632 Block Diagram
No. 4659-32/34
LC85632
Figure 24 LC85632 Application Circuit
No. 4659-33/34
LC85632
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. 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 export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of December, 1998. Specifications and information herein are subject to change without notice. PS No. 4659-34/34

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