LSI LS3262

4 Digit Alarm Clock With Calendar

Features:

(a)Single 1.5V operating voltage.

(b)Directly driving 2x14 segment LCD.

(d)External trigger function in daily alarm output.

(e)Daily Alarm - It generates a sound (4KHz x 8Hz x 1Hz) with external trigger

function for 60 seconds. Pressed any key to stop it.

Chime Function - Every hour on the hour, beep sound (4KHz x 4Hz x 1Hz)

for 1 second.

(f) 32768 Hz quartz crystal provide the time base, and machine cycle = 4KHz.

(g) Power on reset: When the power up, all LCD segments and the alarm sound are

turned on for one second.

(h)Programmable reset: When “ M ” key and “ S ” key press together,

all LCD segments and it generates a sound(4KHz x 8Hz x 1Hz)with

external trigger function. It will be stop and return to normal clock

mode until release all keys..

(i)Low power dissipation.

(j)Keys: “ M --- Mode (mode and adjust), “ S --- setting.

General Description

The LS3262 is a single chip CMOS timer circuit with calendar. It is designed to drive a

LCD(4 digits). The timer circuit is based on a 32768Hz quartz crystal controlled oscillator.

An oscillator capacitor is build in the chip. An external 32768Hz quartz crystal is required

to complete the oscillator circuit. The operation of the basic timekeeping functions is

controlled via two keys. When power up reset, the clock will be reset to 1.1 12:00 and 00

seconds(12 hour format). The circuit has a built-in voltage doubler (to drive the LCD )

which needs two external capacitors. Only one 1.5V battery is required to power the entire

circuit. It has a trigger output to drive external I.C. Direct drive buzzer output.

LSI LS3262

4 Digit Alarm Clock With Calendar

LCD Drawing

COL

ALM

CHIME

((*))

(4)(3)

(2)

(1)

Functional Description

(a) After the power on, it switch into clock state and shows

“12:00”(12 hour format). The default value “1 Jan 12:00:00”.

(b) It shows 12 hour format and four group of “Hour/minute”, “Alarm

time”, “Month/date”, and “second”. In clock state, “Hr : Min”

is shown with colon flashing 0.5 sec on and 0.5 sec off. Press “M”

key to indicate the “Alarm time” (if no key is pressed for 5

seconds, it will auto return to clock state “Hr : Min”), press

“M” key again to indicate the “Month/date” (if no key is pressed

for 5 seconds, it will auto return to clock state “Hr : Min”).

Press again to show the “second”. It can be clear by pressing

“S” key. It will stay in second indication until return to clock

state by pressing “M” key (the colon always on and not flash in

second state, it only flash in clock state “Hr : Min”).

first setting is alarm option (alarm on/off or chime on/off), it can

be change by pressing “M” key. Press “S” key to alarm hour

setting, it can be set cycling from “12: A”(12 hour format) to

“11: A”(12 hour format), “12: P”(12 hour format) to “11: P”(12

hour format) by pressing “M” key. Hold(2 sec) the “M” key will

have auto advance. Press “S” key to alarm minute setting, it can

be set from 0 to 59 by pressing “M” key. Hold (2 sec) the “M”

key will have auto advance. Press “S” key to return normal mode

(with alarm setting) or month setting (without alarm setting), it

can be set from 1 to 12 by pressing “M” key. Hold (2 sec) the

“M” key will have auto advance. Press “S” key to date setting,

it can be set from 1 to 28/30/31(depend the month) by pressing “M”

key. Hold (2sec) the “M” key will have auto advance. Press “S”

key to hour setting, it can be set cycling from “12: A”(12 hour