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| HT1330 3 1/2 Digit Timer + Watch Features * * * * * * A real time watch A 20-hour adjustable range setting countdown timer 20-minute count-up display cycle time 20 hours of count-up time maximum Auto recycle or manual reset the countdown 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 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". 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 48L QFP 1 24th Dec '97 HT1330 Pad Coordinates Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Chip size: 119 x 112 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork. Unit: mil X -62.7 -62.7 -62.7 -62.7 -62.7 -62.7 -62.7 -52.7 -42.7 -32.7 -22.7 -12.7 -2.7 7.3 17.3 Y 58.7 48.7 30.1 17.2 7.3 -18.7 -58.7 -58.7 -58.7 -58.7 -58.7 -58.7 -58.7 -58.7 -58.7 Pad No. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 X 27.3 37.3 47.3 58.3 62.7 62.7 62.7 62.7 43.8 33.8 5.8 -4.3 -38.6 -48.6 Y -58.7 -58.7 -58.7 -58.7 -38.8 -23.7 48.6 58.7 58.7 58.7 58.7 58.7 58.7 58.7 Operational Sequence Notes: 1. S1 for Hour setting 2. S2 for Minute setting 3. S3 to Start/Stop the timer 4. S3>5 seconds into the real time setting mode 5. S1/S2 to reset the timer to the initial state (0:00) 6. S1/S2/S3 to return to the real time mode 2 24th Dec '97 HT1330 Pin/Pad Description Pin No. 11 14 16 17 18 20 24 25 26 27 28 29 30 31 33 34 35 36 37 38 39 46 47 4 5 6 8 9 10 Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Pad Name S3 S2 S1 VEE CAP2 CAP1 COM1 BC3 AG3 FE3 BC2 ADG2 FE2 COD3 BC1 AG1 FE1 KD1 COM2 OSC1 OSC2 BUSY T2 T1 VSS VDD OP BZ BZB I/O I I I -- O O O O O O O O O O O O O O O I O O I/O I/O -- -- I O O Description Input to start/stop the timer Input for minute setting Input for hour setting Negative voltage supply for LCD display For voltage doubling capacitor For voltage doubling capacitor Common 1 drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Segment drive Common 2 drive Oscillator input Oscillator output Timer busy flag, active high Chip test pin Fast-test control pin Negative power supply Positive power supply Option pin for countdown recycle Piezo drive Piezo drive 3 24th Dec '97 HT1330 Absolute Maximum Rating* Supply Voltage ................................. -0.3V to 5V Input Voltage................. VSS-0.3V to VDD+0.3V Storage Temperature................. -50C to 125C Operating Temperature................. -0C to 70C *Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extened periods may affect device reliability. Electric Characteristics Symbol VDD IDD VEE IIN VSTR f/f (Ta=25C) Parameter Supply Voltage Operating Current Display Voltage Switch Input Current Osc Starting Voltage Frequency Stability Alarm Output Drive Current Alarm Output Frequency Busy Flag Output Drive Current Test Conditions VDD 1.5V 1.5V 1.25~1.7V 1.5V -- 1.25~1.7V 1.5V 1.5V 1.5V Min. 1.25 -- -1.2 5 1.35 -- -500 -- -500 Typ. Max. Unit 1.50 -- -1.5 -- -- -- -- 4096 -- 1.70 2 -1.7 50 -- 10 -- -- -- V A Conditions -- Fosc=32768Hz No load -- VIN=VDD Within 3 secs -- VOH=1.35V -- VOH=1.35V V A V PPM A IOHA FOUT IOHF Hz A Functional Description When power is turned on, all the LCD segments are illuminated to display "18:88" and the alarm sounds 2 seconds. For fast-test, hold the "TP1" pin high and the minute digit will be increased every second. In the count-down mode, when the time has gone past the set time and the alarm is stopped, the set time will remain at its current state or be reset to 0:00 depending on the bonding of the "OPT" pin to VDD. In the timer mode, while the timer is counting, the actual time can be displayed by pressing "S1". Once "S1" is released, the count-down time will be 4 shown instead. In the count-up mode, the LCD display is normally in minutes and seconds where the maximum count-up period is 20 minutes. If "S2" is pressed, the LCD display will revert to hours and minutes and the maximum count-up time will turn out to be 20 hours. The timer alarm will sound during the countdown process as listed below: 4 sounds are generated at 10 minutes before the set time is up. 8 sounds are generated at 5 minutes before the set time is up. 24th Dec '97 HT1330 Once the set time is reached, the alarm will sound 60 seconds unless it is stopped by users (by pressing S3), in which case the preset time of the timer will remain unchanged or at 0:00 depending on the status of the option pin. Pressing any one of the inputs (S1 or S2 or S3) will stop the alarm during the period for which the alarm is sounding. At 0:00 in the timer mode, the alarm will sound when S1 and S2 are simultaneously depressed. This is for the alarm test only. After the device is powered on, the alarm will sound two seconds and all segments on the LCD display panel be illuminated. Output Waveform 5 24th Dec '97 HT1330 Operational Flow Chart 6 24th Dec '97 HT1330 LCD Format Typical Application Circuit 7 24th Dec '97 |
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