FEDL9090A-01
1
Semiconductor
ML9090A-01, -02
LCD Driver with Key Scanner and RAM
This version:
May 2001
GENERAL 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
Logic voltage: 2.7 to 5.5 V
LCD drive voltage: 6 to 16 V (positive voltage)
80 segment outputs, 10 common outputs for ML9090A-01 and 18 common outputs for ML9090A-02
Built-in bit-mapped RAM (ML9090A-01: 80
×
10 = 800 bits, ML9090A-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 or tripler circuit
Built-in 5
×
5 key scanner
Port A output
: 1 pin, output current: –15 mA: (may be used for LED driving)
Port B output
: 8 pins
Output current (available for the ML9090A-01 only)
–2 mA : 5 pins
–15 mA : 3 pins
•
Temperature range: –40 to +85°C
•
Package: 128-pin plastic QFP (QFP128-P-1420-0.50-K) (Product name: ML9090A-01GA)
(Product name: ML9090A-02GA)
Comparison between the ML9090A-01 and the ML9090A-02
Item
Number of common outputs
Number of dots on the LCD screen
(selectable by program)
Number of port A outputs
Number of port B outputs
ML9090A-01
10 Max.
8
×
80
9
×
80
10
×
80
1
8
ML9090A-02
18 Max.
16
×
80
17
×
80
18
×
80
1
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