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| 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 Applications * * Electronic dictionaries Portable computers * * Remote controllers Calculators General Description 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 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. Block Diagram 1 28th Aug '98 HT1602 Pad Assignment Chip size: 164 x 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 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 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 Unit: mil 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 2 28th Aug '98 HT1602 Pad Description Pad No. 1~26 27 28 29 30 31, 32 33 34 35 36 37 38 39~52 Pad Name Y14~Y39 DO39 DI20 DO19 VEE V3, V2 VSS VDD CLK DI0 LOAD ALT Y0~Y13 I/O O O I O I I -- -- I I I I O Description LCD driver outputs for segments* Shift register output for the 40th bit data Input data of shift register 2 Shift register output for the 20th bit data LCD power supply LCD bias supply voltage Negative power supply Positive power supply Clock pulse input for the shift register Input data of shift register 1 Latching signal to latch shift register data Alternate input signal for LCD driving waveforms 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 ALT H L Display Data Output Level VEE VDD V3 V2 L H L Absolute Maximum Ratings* Supply Voltage ................................. -0.3V to 6V Input Voltage................. VSS-0.3V to VDD+0.3V Storage Temperature................. -50C to 125C Operating Temperature............... -20C to 70C *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 D.C. Characteristics Symbol VDD IDD ISTB fLCD twCLK VIL VIH VLCD Ta=25C Parameter Operating Voltage Operating Current Standby Current Max. Clock Frequency Clock Pulse Width "L" Input Voltage "H" Input Voltage LCD Driving Voltage Test Conditions VDD -- 5V 5V 5V 5V 5V 5V 5V Min. 4.5 -- -- 3.3 125 -- 0.8VDD 8 Typ. -- 100 1 -- -- -- -- -- Max. 5.5 300 5 -- -- 0.2VDD -- 16 Unit V A A Conditions -- No load -- -- -- -- -- -- MHz ns V V 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 |
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