Sanyo LC85632 Specifications

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Ordering number : EN4659

O3098HA (OT)/71093JN B8-0531 No. 4659-1/34

LC85632

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Digital Alarm Clock

CMOS IC

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.

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.

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)

Package Dimensions

unit: mm

3196-DIP30SD

[LC85632]

SANYO: DIP30SD

LC85632

No. 4659-2/34

Pin Assignment

Pin Functions

Internal equivalent

No. Pin I/O

circuit

Pin function Handling when unused

1 AM & PM O LED output pins Open 2 10’SHRag & d O 3 10’SHRb & e O 4 10’SHRc & HRe O 5 HRb & g O 6 HRc & d O 7 HRa & f O 8 10’SMIN a & f O

9 10’SMIN b & g O 10 10’SMIN c & d O 11 10’SMINe & MINe O 12 MIN b & g O 13 MIN c & d O 14 MIN a & f O 15 COLON O 16 ALM INDICATOR O (VDD – 15 V breakdown voltage) 22 RADIO OUTPUT O Outputs a DC voltage. This pin is controlled by the inputs to Open

the MANUAL & SLEEP pin (pin 26). It operates as a toggle. During normal operation it outputs a low level (high impedance).

(Normal breakdown voltage) 23 ALM-A OUTPUT O Output alarm signals Open 24 ALM-B OUTPUT O 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).

(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 a 10’SMIN f

9 10’SMIN b & g 10’SMIN b 10’SMIN g 10 10’SMIN c & d 10’SMIN c 10’SMIN d 11 10’SMINe & MINe MIN e 10’SMIN e 12 MIN b & g MIN g MIN b 13 MIN c & d MIN d MIN c 14 MIN a & f MIN f MIN a 15 COLON COLON — 16 ALM INDICATOR ALM-A ALM-B

VDD

MANUAL & SLEEP pin input level VDD OPEN VSS

RADIO OUT pin output level (when pulled down to VSS) VDD

VSS

VDD

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

LC85632

Continued from preceding page.

Internal equivalent

No. Pin I/O

circuit

Pin function Handling when unused

20 TIME SET INPUT 3I Input pin that starts the setting/update of the current time, Open

the alarm time, or the calendar date. Normally left open (NOP).

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.

21 CAL DISP & 3I Input pin for calendar display and snooze. Open

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.

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 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 state can be changed.

26 MANUAL & SLEEP 3I Input pin for setting the RADIO OUTPUT pin (pin 22) output Open

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.

Continued on next page.

No. 4659-4/34

VDD

H:L:High threshold

input Low threshold input

VDD

H:L:High threshold

input Low threshold input

Continued from preceding page.

Internal equivalent

No. Pin I/O

circuit

Pin function Handling when unused

28 MODE SELECT 3I Input pin for switching the operating mode. Either left open, connected

Switches the display mode and the clock input to the to VDD, or connected to 50/60 Hz INPUT pin (pin 27). ground.

High: 50 Hz/24 hour display Open: 60 Hz/12 hour display Low: 50 Hz/12 hour display

29 RT-TIME 3I Input pin for switching the enabled/disabled state for setting Open

SET/DIMMER 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

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 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”

LC85632

No. 4659-5/34

VDD

H:L:High threshold

input Low threshold input

VDD

External RC

constant circuit

VDD

H:L:High threshold

input Low threshold input

LC85632

Three Value Input Circuits: H: High level, M: Open, L: Low level, NOP: No operation

• MODE SELECT

Input level Mode

H 50 Hz/24 hour display M 60 Hz/12 hour display L 50 Hz/12 hour display

• TIME SET INPUT

Input level Mode

H Up M NOP L Down

• RE-TIME SET/DIMMER

Input level Mode

H Current time display/current time setting mode 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 M Current time display/NOP L OFF input

• TEST

Input level Mode

H Illegal setting M Normal operation L LED test

No. 4659-6/34

Specifications

Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V

Parameter Symbol Applicable pin Conditions Ratings Unit

Maximum power supply voltage V

max –0.3 to +7.0 V

Input voltage V

(1) All input pins other than the –0.3 to VDD+ 0.3 V

50/60 Hz INPUT pin

VIN(2) 50/60 Hz INPUT Pin voltage –0.3 to VDD+ 0.3

With a 100 kΩ currentlimiting V

– 12 to VDD+ 12 resistor inserted in the input, at that resistor’s terminal.

Input clamping current I

50/60 Hz INPUT With a 100 kΩ limiting resistor –0.4 to +0.4 mA

inserted in the input.

Output voltage V

OUT

(1) CR OSC –0.3 to VDD+ 0.3 V

Output voltage V

OUT

(2) RADIO OUTPUT –0.3 to VDD+ 0.3 V

ALM-A OUTPUT ALM-B OUTPUT

Output voltage V

OUT

(3) LED SEGMENT output pins VDD– 15 to VDD+ 0.3 V

(pins 1 to 16)

Total output current ∑I

LED

Total for the LED The average value of the –280 to 0 mA SEGMENT output pins effective current value within (pins 1 to 16) a single display cycle

according 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 V

4.0 5.0 6.0 V

Input high level voltage V

(1) CR OSC 0.75 V

Input low level voltage V

(1) V

0.25 V

Input high level voltage V

(2) TIME SET INPUT The intermediate is the VDD– 0.5 V

CAL DISP & SNOOZE open pin state.

Input intermediate level voltage VIM(2)

ALM-A/B DISP & SEL The rated values apply

1/2 VDD– 0.5 1/2 VDD+ 0.5 V

MANUAL & SLEEP when an external signal MODE SELECT is applied.

Input low level voltage V

(2)

RT-TIME SET/DIMMER

VSS+ 0.5 V

TEST

Input high level voltage V

(3) 50/60 Hz INPUT VDD– 0.5 VDD+ 0.3 V

Input low level voltage V

(3) V

VDD– 3.0 V Operating frequency fOP 50/60 Hz INPUT 1 2000 Hz Input level hold time tH All three value input pins 10 ms Input chattering time tC All three value input pins 10 ms

LC85632

No. 4659-7/34

LC85632

Electrical Characteristics at Ta = 25°C, VDD= 5 V, VSS= 0 V

Ratings

Parameter Symbol Applicable pin Conditions

min typ max

Unit

Output high level current I

(1) 10’ SHRag & d Output on, (Note 1) –32 mA

OUT

= VDD– 2.0 V

Output off leakage current I

(1) Output off, –20 µA

OUT

= VDD– 12 V

Output high level current I

(2) AM & PM Output on, (Note 2) –16 mA

10’SHRb & e V

OUT

= VDD– 2.0 V 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

Output off leakage current I

(2) COLON Output off, –20 µA

ALM INDICATOR V

OUT

= VDD– 12 V

Output high level current I

(3) RADIO OUTPUT Output on, –2 mA

ALM-A OUTPUT V

OUT

= VDD– 2.0 V

Output off leakage current I

(3)

ALM-B OUTPUT

Output off, –10 µA V

OUT

= V

Input high level current IIH(2) CR OSC VIN= V

10 µA

Input low level current I

(2) VIN= V

–2 mA

Input high level current I

(3) TIME SET INPUT VIN= V

10 100 µA CAL DISP & SNOOZE ALM-A/B DISP & SEL

Input low level current I

(3)

MANUAL & SLEEP

VIN= V

–100 –10 µA

MODE SELECT RT-TIME SET/DIMMER TEST

Pull-up resistance R

TIME SET INPUT VIN= 1/2 V

1.0 MΩ CAL DISP & SNOOZE ALM-A/B DISP & SEL

Pull-down resistance R

MANUAL & SLEEP

0.8 MΩ

MODE SELECT RT-TIME SET/DIMMER TEST

Oscillator stability fS CR OSC (Note 2) V

= 5.0 V –10 +10 %

Oscillator precision fA CR OSC (Note 2) V

= 5.0 V –10 +10 %

Oscillator frequency f

OSC

CR OSC R = 91 kΩ ±1% 4800 Hz

C = 3300 pF ±5%

Initial reset power supply voltage V

DET

Power supply voltage 2.5 4.0 V

range when initial reset operates.

Current dissipation (operating) I

With no output load 2 mA

Note: 1. In addition to not exceeding the total output current

ΣILED (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

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. 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 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 a 10’SMIN f

LC85632

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

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

LC85632

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

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.

LC85632

No. 4659-13/34

LC85632

Operating State Transition Diagram

Figure 6 Operating State Transitions 1: Overall

No. 4659-14/34

Figure 7 Operating State Transitions 2: Current Time Display and Setting Block

LC85632

No. 4659-15/34

Power on

State Display

Initial state

①

Current time, flashing 12 00 (Phase

①

)

: (Phase

②

)

—

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

Depends on the display mode

The clock operates even in this state.

Normal clock Not set Not set Not set

To the alarm display and setting blockTo the calendar and snooze block To the manual and sleep block

Application of a high or low level to the ALM-A/B DISP & SEL pin.

Application of a high or low level to the CAL DISP & SNOOZE pin.

Application of a high or low level to the MANUAL & SLEEP pin.

State Display

Normal display Current time Current time Lit —

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

Depends on the display mode

The TIME SET INPUT is a NOP in this mode.

Normal clock No change No change No change

State Display

Normal state Current time Current time Lit Lit* — Normal clock Set Not set Not set

Numbers Colon 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

Flashing Lit for enabled alarms

Current time setting mode

State

Numbers

Application of a high level to the RT-TIME SET/ DIMMER pin.

Making the RT-TIME SET/ DIMMER pin open.

Display

Current time

Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

Depends on the display mode

No change No change No change

Linked to the + and – inputs

Flashing Lit for enabled alarms

Current time setting mode

State

Numbers

Alarm operation starts at the point the time matches an alarm setting time.

Application of a high level to the RT-TIME SET/ DIMMER pin.

Making the RT-TIME SET/ DIMMER pin open.

Note: The “Display” sections indicates the states of the LED display.

Abbreviations: ALM IND. ➝ Alarm indicator, AM/PM ➝ 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.

LC85632

Figure 8 Operating State Transitions 3: Alarm Display and Setting Block

No. 4659-16/34

From initial state

①

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 TIME SET INPUT pin.

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.

State Display

Initial state

②

Alarm 12 00 Flashing Either A or B flashing

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

If the current time display is flashing, that flashing is stopped.

Application of a high or low level to the ALM-A/B DISP & SEL pin, 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

State Display

Alarm operation disable Alarm Set time display Flashing Enabled alarm flashing

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

In the alarm not set mode, the alarm will not operate even if the set time is the same as the current time.

Operation enabled — —

Depends on the display mode

Alarm setting time display

Display

Alarm

Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

Depends on the display mode

Operation enabled — —

Linked to the + and – inputs

Flashing Either A or B flashing

Alarm time setting

State

Numbers

Alarm output starts if the current time matches the setting time.

Making the TIME SET INPUT pin open.

Application of a low level to the MANUAL/ SLEEP pin.

Application of a high or low level to the TIME SET INPUT pin.

Figure 9 Operating State Transitions 4: Calendar Display and Setting Block

LC85632

No. 4659-17/34

From initial state

①

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 TIME SET INPUT pin.

State Display

Initial state

③

Calendar 1 1 Off Enabled alarms lit Off Normal clock No change No change No change

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

Application of a high or low level to the CAL DISP & SNOOZE pin in the initial state (1) state, thus 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 settingState

Numbers

When backing up the calendar the date (display) changes from 3/1 to 2/29, and then to 2/28.

Making the TIME SET INPUT pin open.

Application of a high or low level to the TIME SET INPUT pin.

Making the CAL DISP & SNOOZE pin open.

State Display

Calendar display Calendar Current date Off Enabled alarms lit Off Normal clock No change No change No change

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

LC85632

Figure 10 Operating State Transitions 5: Manual and Sleep Block

No. 4659-18/34

Current time display and setting block

(From initial state

①

)

Was

there an ON

input?

Turn on the display and

set the RADIO OUTPUT

pin high.

ON state

Sleep setting

Have 2

seconds passed

since the

input?

Was

there an ON

input?

Reset the sleep count

to 90 minutes.

Have 2

seconds passed

since the

input?

Was

there an ON

input?

To the current time display and

setting block

Start the sleep count

Reset the sleep count

to 60 minutes.

Have 2

seconds passed

since the

input?

Was

there an ON

input?

Reset the sleep count

to 45 minutes.

Have 2

seconds passed

since the

input?

Was

there an ON

input?

Reset the sleep count

to 30 minutes.

Have 2

seconds passed

since the

input?

Was

there an ON

input?

Reset the sleep count

to 15 minutes.

Have 2

seconds passed

since the

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 display Sleep setting time Off Enabled alarms lit Off Linked to “ON” inputs No change Count starts —

Numbers Colon ALM IND AM/PM

ALARM SLEEP SNOOZE

Operation

Note:

The sleep setting time is changed according to “ON” inputs.

** “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.)

Yes

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 ① 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 ② 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.

LC85632

No. 4659-19/34

LC85632

Setting the Time

* RT-TIME SET/DIMMER [Pin 29]

VSS OPEN VDD

DIMMER NOP Current time setting mode (1/4 DUTY) (Current time display)

* TIME SET INPUT [Pin 20]

VSS OPEN VDD

DOWN NOP UP (Back) (Current time display) (Forward)

(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

Alarm

* ALM-A/B DISP & SEL. [Pin 25]

OPEN V

Alarm B set time display NOP Alarm A set time display (Setting enabled) (Current 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.”)

LC85632

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.

Figure 13 Alarm Output Waveform Overview (for the case where the output is a

DC signal unmodulated by any tone)

No. 4659-22/34

• 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): Off

— Normal operation (Alarm time set and alarm enabled) : On — Alarm setting mode : Flashing (1 Hz) — Initial state flashing mode : Lit (not flashing) — Flashing mode following a power loss : 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.

LC85632

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 1 2 3 4 5 6 7 8 9 10 11 12 Days 31 28 31 30 31 30 31 31 30 31 30 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]

OPEN V

Calendar display and set NOP Calendar display and set (Month-day display) (Current time 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 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

• 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

LC85632

No. 4659-25/34

LC85632

No. 4659-26/34

Manual and Sleep

* MANUAL & SLEEP [Pin 26]

OPEN V

OFF input NOP ON input

(Current time display) Sleep-in

(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.

• 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.

LC85632

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 VDDvoltage. 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 VDDvoltage to prevent creating an unbalanced display duty.

Note that the overdrive portion of the input waveform that exceeds the VDDand VSSvoltages (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

(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.

LC85632

No. 4659-29/34

LC85632

Self Test Mode

* TEST [Pin 18]

OPEN V

LED self test mode Normal operation 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 Input level Corresponding LED segment

RT-TIME SET High level a segment

TIME SET INPUT High level b segment TIME SET INPUT Low level c segment ALM-A/B DISP & SEL High level d segment

ALM-A/B DISP & SEL Low level e segment MANUAL & SLEEP High level f segment MANUAL & SLEEP Low level g segment CAL DISP & SNOOZE Both

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 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

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.

LC85632

No. 4659-31/34

LC85632

Figure 23 LC85632 Block Diagram

No. 4659-32/34

Figure 24 LC85632 Application Circuit

LC85632

No. 4659-33/34

LC85632

PS No. 4659-34/34

This catalog provides information as of December, 1998. Specifications and information herein are subject to change without notice.

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.

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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.

Sanyo LC85632 Specifications

Specifications and Main Features

Frequently Asked Questions

User Manual