ML9050 datasheet(6/71 Pages) OKI | 132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays

6 page

¡ Semiconductor

ML9050/9051

6/71

PEDL9050-02

Function

Pin name

Number

of pins

Description

I/O

ML9050

8/9

¥ V1

6/7

¥ V1

7/9

¥ V1

5/7

¥ V1

2/9

¥ V1

2/7

¥ V1

1/9

¥ V1

1/7

¥ V1

Power

supply

circuit

2—

VRS

This is the external input VREG power supply for the LCD power supply

voltage adjustment circuit.

(This pin should be left open when not used as an external input)

This pin is effective only in the case of optional devices with the VREG

external input option.

VOUT

These are the output pins during voltage multiplication. Connect a

capacitor between these pins and VSS.

—

These are the multiple level power supply pins for the LCD power supply.

The voltages specified for the LCD cells are applied to these pins after

resistor network voltage division or after impedance transformation using

operational amplifiers. The voltages are specified taking VSS as the

reference, and the following relationship should be maintained among

them.

≥ V2 ≥ V3 ≥ V4 ≥ V5 ≥ VSS

Master operation: When the power supply is ON, the following voltages

are applied to V2 to V5 from the built-in power supply circuit. The

selection of voltages is determined by the LCD bias set command.

Voltage adjustment pins. Voltages between V1 and VSS are applied

using a resistance voltage divider.

These pins are effective only when the internal resistors for voltage V1

adjustment are not used (IRS = "L").

Do not use these pins when the internal resistors for voltage V1

adjustment are used (IRS = "H").

VC1+

These are the pins for connecting the positive side of the capacitors for

voltage multiplication.

Connect capacitors between VS1– and these pins.

VS1–

These are the pins for connecting the negative side of the capacitors for

voltage multiplication.

Connect capacitors between these pins and VC1+, VC3+, and VC5+.

ML9051

7/8

¥ V1

5/6

¥ V1

6/8

¥ V1

4/6

¥ V1

2/8

¥ V1

2/6

¥ V1

1/8

¥ V1

1/6

¥ V1

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