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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)