HT1602 40 Dot Matrix LCD Segment Driver Features • • • Operating voltage: 4.5V~5.5V LCD driving voltage: 8V~16V Applicable LCD duty cycle from 1/8 to 1/64 • • Suitable for various types of LCD panel Bias voltage adjustable from an external source • • Remote controllers Calculators Applications • • Electronic dictionaries Portable computers General Description then send them out as LCD driving waveforms to the LCD panel. The HT1602 can be applied up to 1/64 duty. Furthermore, the bias voltage which determines the LCD driving voltage can be optionally supplied from an external source, thus the chip is suitable for driving various types of LCD panel. These special features increase the versatility of the chip. The HT1602 is a dot matrix LCD segment driver LSI implemented in CMOS technology. It is equipped with a 40-bit shift register (two 20-bit shift registers), a 40-bit latch (two 20-bit latches), a 40-bit level shifter, a 40-bit 4-level driver, and control circuits. The HT1602 can convert serial data received from an LCD controller to parallel data and Block Diagram 1 28th Aug ’98 HT1602 Pad Assignment Chip size: 164 × 164 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork. Pad Coordinates Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 X –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –66.33 –50.81 –42.26 –33.71 –25.16 Unit: mil Y 76.23 68.13 60.03 51.93 43.83 35.73 –27.63 –35.73 –43.83 –51.93 –60.03 –68.13 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 Pad No. 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 X –16.61 –8.10 0.5 9.10 17.60 26.15 34.70 43.25 51.89 75.78 75.78 75.78 75.78 75.78 75.78 75.78 75.78 75.78 2 Y –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –76.23 –67.14 –56.34 –46.62 –35.64 –24.75 –13.32 6.03 33.66 Pad No. 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 X 75.78 75.78 61.20 52.56 43.65 35.10 25.20 15.71 6.66 –3.06 –12.83 –21.60 –32.04 –42.48 –52.92 –62.15 Y 42.66 61.56 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 76.23 28th Aug ’98 HT1602 Pad Description Pad No. Pad Name I/O Description 1~26 Y14~Y39 O LCD driver outputs for segments* 27 DO39 O Shift register output for the 40th bit data 28 DI20 I Input data of shift register 2 29 DO19 O Shift register output for the 20th bit data 30 VEE I LCD power supply 31, 32 V3, V2 I LCD bias supply voltage 33 VSS — Negative power supply 34 VDD — Positive power supply 35 CLK I Clock pulse input for the shift register 36 DI0 I Input data of shift register 1 37 LOAD I Latching signal to latch shift register data 38 ALT I Alternate input signal for LCD driving waveforms 39~52 Y0~Y13 O LCD driver outputs for segments* *: For Y0~Y39, any of VDD, V2, V3 or VEE can be selected as a display driving source according to the combination of latched data level and ALT signal. Refer to the following table: Latched Data H L ALT Display Data Output Level H VEE L VDD H V3 L V2 Absolute Maximum Ratings* Supply Voltage ................................. –0.3V to 6V Storage Temperature................. –50°C to 125°C Input Voltage................. VSS–0.3V to VDD+0.3V Operating Temperature............... –20°C to 70°C *Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings” may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. 3 28th Aug ’98 HT1602 Ta=25°C D.C. Characteristics Symbol Parameter Test Conditions VDD Conditions Min. Typ. Max. Unit VDD Operating Voltage — — 4.5 — 5.5 V IDD Operating Current 5V No load — 100 300 µA ISTB Standby Current 5V — — 1 5 µA fLCD Max. Clock Frequency 5V — 3.3 — — MHz twCLK Clock Pulse Width 5V — 125 — — ns VIL “L” Input Voltage 5V — — — 0.2VDD V VIH “H” Input Voltage 5V — 0.8VDD — — V VLCD LCD Driving Voltage 5V — 8 — 16 V 4 28th Aug ’98 HT1602 Timing Diagrams 1/64 duty and 1/9 bias (with the ALT changing polarity for every frame, a frame=64 commons) 5 28th Aug ’98 HT1602 Application Circuits 1/32 duty and 1/7 bias 6 28th Aug ’98