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    Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

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    Description

    The HD66727, dot-matrix liquid crystal display controller and driver LSI incorporating a key scan function, displays alphanumerics, katakana, hiragana, and symbols. It can be configured to drive a dotmatrix liquid crystal display and control key scan functions under the control of an I2C bus or a clocksynchronized serial microprocessor. A single HD66727 is capable of displaying up to four 12-character lines, 40 segments, and 12 annunciators, and controlling up to a 4-by-8 key matrix, and driving three LED. The HD66727 incorporates all the functions required for driving a dot-matrix liquid crystal display such as display RAM, character generator, and liquid crystal drivers, and it also incorporates a booster for the LCD power supply and key scan functions.

    Features

    ? Control and drive of a dot-matrix LCD with built-in key scan functions

    ? Four 12-character lines, 40 segments, and 12 annunciators

    ? Control of up to a 4 ¡Á 8-key matrix, 3 LED ports and 3 general ports

    ? Low-power operation support:

    - 2.4 to 5.5V (low voltage)

    - Double or triple booster for liquid crystal drive voltage

    - Contrast adjuster and voltage followers for decreasing the direct current flow in the LCD drive bleeder-resistors

    - Standby mode and sleep mode

    - Displays up to 12 static annunciators

    ? I2C bus or clock-synchronized serial interface

    ? 60 ¡Á 8-bit display data RAM (60 characters max)

    ? 11,520-bit character generator ROM

    - 240 characters (6 ¡Á 8 dots)

    ? 32 ¡Á 6-bit character generator RAM

    - 4 characters (6 ¡Á 8 dots)

    ? 8 ¡Á 6-bit segment RAM

    - 40 segment-icons and marks max

    ? 60-segment ¡Á 34-common liquid crystal display driver

    ? Programmable display sizes and duty ratios (see Table 1)

    ? Vertical smooth scroll

    ? Vertical double-height display of all character fonts

    ? Horizontal double display with dedicated character fonts (6-dot font width used)

    ? Wide range of instruction functions:

    - Clear display, display on/off control, icon and mark control, character blink, white-black inverting blinking cursor, icon and mark blink, return home, cursor on/off, white-black inverting raster-row

    ? Internal oscillation with an external resistor

    ? Hardware reset

    ? Wide range of LCD drive voltages

    - 3.0V to 13.0V

    ? Slim chip with bumps for chip-on-glass (COG) mounting, slim chip without bumps for chip-on-board (COB) mounting, and tape carrier package (TCP) (under development)

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      Hitachi Semiconductor

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      Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

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