HT1330 Datasheet, PDF (1/8 Pages) Holtek Semiconductor Inc – 3 1/2 Digit Timer + Watch

HT1330
3 1/2 Digit Timer + Watch
Features
· 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
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
Pin Assignment
· 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
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.
48 47 46 45 44 43 42 41 40 39 38 37
NC 1
36 K D 1
NC 2
35 FE 1
NC 3
34 A G 1
T1 4
33 B C 1
VSS 5
32 N C
VDD 6
H T1330
31 C O D 3
NC 7
OP 8
48L Q FP
30 FE 2
29 A D G 2
BZ 9
B ZB 10
28 B C 2
27 FE 3
S 3 11
26 A G 3
N C 12
25 B C 3
13 14 15 16 17 18 19 20 21 22 23 24
1
August 10, 2000