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| HT1612 Timer with Dialer Interface Features * * * * Operating voltage: 1.2V~1.7V Dialing number and conversation time display Conversation timer (Max. to 59 mins and 59 secs) Operation current: 10A (Typ.) * * * 32768Hz crystal 8 or 10 digits LCD display driver, 3V, 1/2 bias, 1/3 duty (8 digits hand-held calculator LCD is used for 8 digits application) Built-in dialer interface Applications * * Timers LCD display drivers * * Telephone display interface Instrument display General Description The HT1612 is a CMOS chip designed for dialer interface which drives 8 or 10 digits LCD. Various functions, such as displaying dialing number and conversation time, are provided. It normally shows blanks. The timer is started to tell users how long the conversation time has been taken when answering a telephone call. After hanging up the telephone, it returns to show blanks immediately. Whenever makeing a phone call, the HT1612 receives dialing data from the dialer and displays the phone number from left to right on the LCD. However, if there is no dialing action within 10 seconds, it restarts the timer again. By adding a TIMER key, the HT1612 can provide the timer reset/hold functions (refer to functional description for more details). 1 5th July '95 HT1612 Block Diagram Pad Assignment Chip size: 136 x 134 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork. 2 5th July '95 HT1612 Pad Coordinates Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Unit: mil X -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -61.92 -57.80 -45.90 -36.50 -28.86 Y 41.65 33.98 26.30 17.85 10.95 3.17 -4.53 -12.22 -19.96 -27.60 -35.26 -42.95 -52.26 -60.80 -60.80 -60.80 -60.80 Pad No. 18 19 20 21 22 23 24 25 26 27 28 29 38 39 31 32 33 X -18.66 4.72 12.36 20 34.98 50.02 61.67 61.63 61.63 61.63 61.63 61.63 61.63 61.63 61.63 61.63 61.63 Y -60.80 -60.80 -60.80 -60.80 -60.46 -60.46 -60.80 -42.18 -33.98 -25.82 -17.66 -9.50 -1.34 6.80 14.98 23.14 31.30 Pad No. 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 X 61.63 61.63 61.63 41.78 33.62 25.46 17.30 9.14 0.98 -7.18 -15.34 -23.50 -31.66 -39.82 -47.98 -56.14 Y 39.46 47.60 55.79 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 61.14 Pad Description Pad Name SEG1~SEG30 COM1~COM3 HK X2 X1 T2 T1 INT TIMER I/O O O I O I I I O I Internal Connection CMOS OUT CMOS OUT CMOS IN Pull-High Description LCD segement signal output pads LCD common signal output pads Hook switch detector input Active low OSCILLATOR 32768Hz crystal oscillator output OSCILLATOR 32768Hz crystal oscillator input CMOS IN Pull-High CMOS IN Pull-High NMOS OUT CMOS IN Pull-Low Test pad (connected to VSS for production test) Test pad (connected to VSS for production test) Interrupt output, 8 or 16Hz by mask option Timer reset and start/hold toggle control input pad 3 5th July '95 HT1612 Internal Connection CMOS IN Pull-High CMOS IN Pull-High -- CMOS OUT CMOS OUT CMOS OUT -- -- Pad Name DI SK VSS VA VB VC VDD NC I/O I I I O O O I -- Description Serial data input pad (connected to the dialer) Data should be valid at the falling edge of SK Clock input pad (connected to the dialer) Negative power supply (GND) Voltage doubler, connected to the external capacitor Voltage doubler, connected to the external capacitor Voltage doubler, connected to the external capacitor Positive power supply No connection Approximate internal connection circuit Absolute Maximum Rantings Supply Voltage ............................... -0.3V to 5V Input Voltage ..................... VSS-0.3 to VDD+0.3 Storage Temperature ............... -50C to 125C Operating Temperature ............. -20C to 75C 4 5th July '95 HT1612 Electrical Characteristics Symbol VDD VIL VIL ISTB IDD IOL TA TB TC TDB RHI RLO FOSC (FOSC=32768Hz, Ta=25C) Parameter Operating Voltage Input Low Voltage Input High Voltage Stand-by Current Operating Current Output Sink Current of INT Data Setup Time Data Hold On Time Inter Digit Time Debounce Time (HK, TMIER) Pull-High Resistance (HK , DI, SK) Pull-Low Resistance (TIMER) System Frequency -- Test Condition VDD Condition -- -- -- VHK=Floating (or VDD) No load VO=0.3V -- -- -- -- VIN=0V VTIMER=1.5V Crystal=32768Hz Min. 1.2 VSS 0.8VDD -- -- 500 1 2 5 -- -- -- -- Typ. 1.5 -- -- 0.1 10 1000 -- -- -- 31.25 1 5 32768 Max. 1.7 0.2VDD VDD 1 30 -- -- -- -- - -- -- -- Unit V V V A A A s s s 1.2V~1.7V 1.2V~1.7V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V ms M M Hz 5 5th July '95 HT1612 Functional Description Operational flow chart 6 5th July '95 HT1612 About On-Hook & Off-Hook Note: 1. Figure a displays blanks. 2. Figure b illustrates a timer mode caused by Off-Hook; timer is reset and starts to count the conversation time. 3. In Figure c. The dialing data are received and displayed on the LCD from left to right after Off-Hook. When the entry interval is over 10 seconds, it resets the timer and starts to count. 7 5th July '95 HT1612 TIMER key function In the conversation timer mode, the TIMER key can reset or hold the timer. Data & Timing * Data latch timing * For instrument or C application The HT1612 is also capable of displaying the BCD data which are generated from instruments or C system. The corresponding data and timing are shown in Data latch timing. Before the data are transmitted to the HT1612, the HK pin should be pull-low or keeps low always. Then, the HT1612 is ready to receive the data. At the falling edge of the clock the data are shifted to the IC. After the whole data are sent to the HT1612, the SK pin is set low to avoid switching to the timer mode. 8 5th July '95 HT1612 * For telephone application The HT1612 is designed to display telephone numbers which are derived from the HT92XXX series telephone dialers. The corresponding data are illustrated in the following table. 9 5th July '95 HT1612 Application Circuits For telephone interfacing The IC substrate should be connected to VDD in the PCB layout artwork. 10 5th July '95 HT1612 For instrument or C use (1.5V supply) The IC substrate should be connected to VDD in the PCB layout artwork. Note: 1. To drive the SK, DI, and HK pin, an open drain NMOS output structure is recommended. 2. To drive the SK, DI and HK pin with CMOS output structure, a voltage divider is needed (R=4.3K, R1=10K). 11 5th July '95 HT1612 For insturment or C use (3V supply) The IC substrate should be connected to VDD in the PCB layout artwork. Note: 1. To drive the SK, DI, and HK pin, an open drain NMOS output structure is recommended. 2. To drive the SK, DI and HK pin with CMOS output structure, a voltage divider is needed (R=20K, R1=10K). 12 5th July '95 HT1612 LCD Connection For 8-digit application Segment Electrode Side LCD driving system 1/2 bias, 1/3 duty, 3V. Common Electrode Side 13 5th July '95 HT1612 LCD Connection For 10-digit application Segment Electrode Side * LCD driving system 1/2 bias, 1/3 duty, 3V. Common Electrode Side 14 5th July '95 |
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