FEDL9090A-01

1Semiconductor

This version:

May 2001

ML9090A-01, -02

LCD Driver with Key Scanner and RAM

1/41

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

ML9090A-01

ML9090A-02

Number of common outputs

10 Max.

18 Max.

Number of dots on the LCD screen

(selectable by program)

8

× 80

9

× 80

10

× 80

16

× 80

17

× 80

18

× 80

Number of port A outputs

1

1

Number of port B outputs

8

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