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AY0438-I-P Datasheet(PDF) 1 Page - Microchip Technology |
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AY0438-I-P Datasheet(HTML) 1 Page - Microchip Technology |
1 / 11 page © 1995 Microchip Technology Inc. DS70010I-page 1 FEATURES • Drives up to 32 LCD segments of arbitrary config- uration • CMOS process for: wide supply voltage range, low- power operation, high-noise immunity, wide temperature range • CMOS and TTL-compatible inputs • Electrostatic discharge protection on all pins • Cascadable • On-chip oscillator • Requires only three control lines APPLICATIONS • Industrial displays • Consumer product displays • Telecom product displays • Automotive dashboard displays DESCRIPTION The AY0438 is a CMOS integrated device that drives a liquid crystal display, usually under microprocessor control. The part acts as a smart peripheral that drives up to 32 LCD segments. It needs only three control lines due to its serial input construction. It latches the data to be displayed and relieves the microprocessor from the task of generating the required waveforms. The AY0438 can drive any standard or custom parallel drive LCD display, whether it be field effect or dynamic scattering; 7-, 9-, 14- or 16-segment characters; deci- mals; leading + or -; or special symbols. Several AY0438 devices can be cascaded. The AC frequency of the LCD waveforms can either be supplied by the user or generated by attaching a capacitor to the LCD input, which controls the frequency of an internal oscil- lator. The AY0438 is available in 40-lead dual in-line plastic and 44-lead PLCC packages. Unpackaged dice are also available. PIN CONFIGURATION CLOCK SEG 1 SEG 2 SEG 3 VSS DATA OUT DATA IN SEG 4 SEG 5 LCD Φ BP SEG 6 SEG 7 SEG 8 SEG 9 SEG 10 SEG 11 SEG 12 SEG 13 SEG 14 VDD LOAD SEG 32 SEG 31 SEG 30 SEG 29 SEG 28 SEG 27 SEG 26 SEG 25 SEG 24 SEG 23 SEG 22 SEG 21 SEG 20 SEG 19 SEG 18 SEG 17 SEG 16 SEG 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 NC DATA OUT DATA IN SEG 4 SEG 5 LCD Φ BP SEG 6 SEG 7 SEG 8 NC SEG 29 SEG 28 SEG 27 SEG 26 SEG 25 SEG 24 SEG 23 SEG 22 SEG 21 SEG 20 SEG 19 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 40-Lead Dual In-line 44 PLCC AY0438 AY0438 32-Segment CMOS LCD Driver |
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