HT1330
3 1/2 Digit Timer + Watch
Features
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A real time watch
A 20-hour adjustable range setting
count-down timer
20-minute count-up display cycle time
20 hours of count-up time maximum
Auto recycle or manual reset the
count-down timer by bonding option
Hours and minutes are set independently
Real time display in timer mode
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5-minute/10-minute pre-alarm
DC output and piezo output
An internal voltage doubler
Busy flag output high in timer counting
3 1/2 digit LCD display
32768Hz crystal oscillator
Single 1.5V battery operation
48L-pin QFP package
General Description
The HT1330 is a CMOS fabricated LSI chip de-
signed to drive a standard three and 1/2 digit
biplexed LCD for a count-up/down timer in
watch applications. The watch and timer are
based on a 32768Hz quartz crystal oscillator.
The maximum count-down time is 20 hours
with an accuracy of 1 second. The maximum
count-up period is 20 hours, but the LCD will
normally display a maximum period of 19 min-
utes and 59 seconds. If the user presses switch
²S2²,
the total count-up time in hours and min-
utes will be displayed. In the count-up/down
mode, the real time can be seen by pressing
switch
²S1²
and return to the count-up/down
mode by releasing
²S1².
Once the count-down is finished, the timer can
either automatically recycle the preset time or
manually reset the desired time depending on
the selected bonding-pad option. The forecast
alarm generates 4 alarm sounds at 10 minutes
before set time and 8 alarm sounds at 5 minutes
before set time. The HT1330 can be used as a
parking timer, an alarm timer, a pill box timer,
a kitchen timer, a sports timer, etc.
Pin Assignment
C O
O S
O S
B U
M 2
C 1
C 2
N C
N C
N C
N C
N C
N C
S Y
T 2
N C
1
2
3
4
5
6
7
8
9
1
1
1
4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7
3
3
3
3
3
3
H T 1 3 3 0
3
4 8 L Q F P
2
2
2
0
2
1
2
2
1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4
6
5
4
3
2
1
0
9
8
7
6
5
S 2
N C
K D 1
F E 1
A G 1
B C 1
N C
C O D 3
F E 2
A D G 2
B C 2
F E 3
A G 3
B C 3
N C
N C
T 1
V S S
V D D
N C
O P
B Z
B Z B
S 3
N C
N C
C O M 1
N C
N C
N C
C A P 1
N C
C A P 2
V E E
S 1
N C
1
August 10, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
