PEDL9090-02
¡ Semiconductor
ML9090-01,-02
LCD Driver with Key Scanner and RAM
This version: Jan. 2000
Previous version: Nov. 1998
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GENERAL DESCRIPTION
The ML9090-01 and ML9090-02 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 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
¥
16 dots (80
¥
8 dots
for the ML9090-01, 80
¥
16 dots for the ML9090-02) and an arbitrator display system of 80
¥
2 dots.
Since containing voltage multipliers, the ML9090-01 and ML9090-02 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
• Logic voltage: V
DD
2.7 to 5.5 V
• LCD drive voltage: V
BI
6 to 16 V (positive voltage)
• 80 segment outputs,10 common outputs for ML9090-01 and 18 common outputs for ML9090-
02
• Built-in bit-mapped RAM (ML9090-01: 80
¥
10 = 800 bits, ML9090-02: 80
¥
18 = 1440 bits)
• 4-pin serial interface with CPU:
CS, CP,
DI/O, KREQ
• Built-in LCD drive bias resistors
• Built-in voltage doubler and tripler circuits
• Built-in 5
¥
5 key scanner
• Port A output : 1 pin, output current: -15mA: (may be used for LED driving)
• Port B output : 8 pins
Output current (available for the ML9090-01 only)
–2mA : 5 pins
–15mA : 3 pins
• Temperature range: –40 to +85˚C
• Package: 128-pin plastic QFP (QFP128-P-1420-0.50-K) (Product name: ML9090-01GA)
(Product name: ML9090-02GA)
Model
Display duty
No. of display lines
No. of port B outputs
1/8
8
8
ML9090-01
1/9
9
8
1/10
10
8
1/16
16
—
ML9090-02
1/17
17
—
1/18
18
—
APPLICATION
• Car audio
1/38
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