ML9090A-02 데이터 시트보기 (PDF) - Oki Electric Industry

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ML9090A-02

LCD Driver with Key Scanner and RAM

Oki Electric Industry 

1Semiconductor

FEDL9090A-01

ML9090A-01, -02

• RESET

Reset signal input pin. The initial state can be set by pulling this pin to an “L” level. Refer to the “Output, I/O and

Register States in Response to Reset Input” page for the initial states of each register and display.

An internal pull-up resistor is connected to this pin. An external capacitor is connected for power-on-reset

operation.

• TEST

Test signal input pin. This pin is used for testing by Oki. Connect this pin to VSS. When a different connection is

made, proper operation cannot be guaranteed.

• R0 to R4

Key switch scan signal output pins. During the scan operation, “L” level signals are output in the order of R0,

R1, ...R4. (Refer to the page entitled “Key scan” for details.)

• C0 to C4

Input pins that detect the key switch status. Internal pull-up resistors are connected to these pins. Assemble a key

matrix between these pins and the R0 to R4 pins.

• PA0

General-purpose port A output pin. Because this pin can output a current of –15 mA, it is best suited as an LED

driver. If this pin is used as an LED driver, insert an external current limiting resistor in series with the LED. If this

pin is not used, leave it unconnected (open).

• PB0 to PB7

General-purpose port B output pins. Each of the PB5 to PB7 pins has the same driving capability as the PA0 pin,

namely the ability to output a current of –15 mA. These pins are only applicable to the ML9090A-01. Leave

unused pins unconnected (open).

• SEG1 to SEG80

Segment signal output pins for LCD driving. Leave unused pins unconnected (open).

• COM1 to COM18

Common signal output pins for LCD driving. Leave unused pins unconnected (open). COM11 to COM18 are

provided for the ML9090A-02 and PB0 to PB7 for the ML9090A-01.

• VDD

Logic power supply connection pin.

• VSS

Power supply GND connection pin.

• DT

This pin selects the voltage multiplier circuit. If this pin is connected to the VSS pin, the voltage doubler circuit is

selected. If this pin is connected to the VDD pin, the voltage tripler circuit is selected. Do not change the value of the

setting after power is turned on.

• VC1, VC2

Capacitor connection pins for the voltage multiplier. Connect a 4.7 µF capacitor between the VC1 and VC2 pins. If

an electrolytic capacitor is used, connect the (+) side to pin VC2.

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