LCD Driver with Key Scanner
and RAM
Documents
| » PDF of this Data Sheet (323 KB) is
available. |
ML9090A.pdf
|
Description
The
ML9090A-01 and ML9090A-02 are LCD drivers that contain internal RAM and a key
scan function. They are best suited for car audio displays. Since 1-bit data of
the display data RAM corresponds to the light-on or light-off of 1-dot of the
LCD panel (a bit map system), a flexible display is possible. A single chip can
implement a graphic display system of a maximum of 80 × 18 dots (80 × 10 dots
for the ML9090A-01, 80 × 18 dots for the ML9090A-02). Since containing voltage
multipliers, the ML9090A-01 and ML9090A-02 require no power supply circuit to
drive the LCD. Since the internal 5 × 5 scan circuit has eliminated the needs of
key scanning by the CPU, the ports of the CPU can be efficiently used.
Features
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Logic voltage: 2.7 to 5.5 V |
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LCD drive voltage: 6 to 16 V (positive voltage) |
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80 segment outputs, 10 common outputs for ML9090A-01 and 18
common outputs for ML9090A-02 |
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Built-in bit-mapped RAM (ML9090A-01: 80 × 10 = 800 bits,
ML9090A-02: 80 × 18 = 1440 bits) |
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4-pin serial interface with CPU: CS, CP, DI/O, KREQ |
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Built-in LCD drive bias resistors |
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Built-in voltage doubler or tripler circuit |
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Built-in 5 × 5 key scanner |
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Port A output : 1 pin, output current: –15 mA: (may be used
for LED driving) |
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Port B output : 8 pins
Output current (available for the
ML9090A-01 only)
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2mA : 5 pins |
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15mA : 3 pins | |
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Temperature range: –40 to +85°C |
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Package: 128-pin plastic QFP
(QFP128-P-1420-0.50-K)
(Product name: ML9090-01GA)
(Product name:
ML9090-02GA) |
Application
