General Description

The HT1330 is a CMOS fabricated LSI chip designed 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 minutes and 59 seconds. If the user presses switch S2, the total count-up time in hours and minutes will be displayed. In the count-up/down mode, the real time can be seen by pressing switch S1 and return to the count-up/down mode by releasing S1.

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

• 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