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¹¦ÄÜÃèÊö | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function |
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Éú²ú³§ÉÌ | Hitachi Semiconductor |
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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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