ST7565P datasheet(19/71 Pages) SITRONIX

19 / 71 page

ST7565P

Ver 2.1b

19/71

2009/09/14

PIIN

N D

RIIP

TIIO

Power Supply Pins

Pin Name

I/O

Function

No. of Pins

VDD

Power

Supply

Power supply

VDD2

Power

Supply

Power supply

VSS

Power

Supply

Ground

VRS

Power

Supply

This is the internal-output VREG power supply for the LCD power supply voltage

regulator.

V0, V1,

V2, V3,

V4,Vss

Power

Supply

This is a multi-level power supply for the liquid crystal drive. The voltage Supply

applied is determined by the liquid crystal cell, and is changed through the use of a

resistive voltage divided or through changing the impedance using an op. amp.

Voltage levels are determined based on Vss, and must maintain the relative

magnitudes shown below.

V0 ≧V1 ≧V2 ≧V3 ≧V4 ≧Vss

When the power supply turns ON, the internal power supply circuits produce the V1

to V4 voltages shown below. The voltage settings are selected using the LCD bias

set command.

1/65 DUTY

1/49 DUTY

1/33 DUTY

1/55 DUTY

1/53 DUTY

8/9*V0,6/7*V0

7/9*V0,5/7*V0

2/9*V0,2/7*V0

1/9*V0,1/7*V0

7/8*V0,5/6*V0

6/8*V0,4/6*V0

2/8*V0,2/6*V0

1/8*V0,1/6*V0

5/6*V0,4/5*V0

4/6*V0,3/5*V0

2/6*V0,2/5*V0

1/6*V0,1/5*V0

7/8*V0,5/6*V0

6/8*V0,4/6*V0

2/8*V0,2/6*V0

1/8*V0,1/6*V0

7/8*V0,5/6*V0

6/8*V0,4/6*V0

2/8*V0,2/6*V0

1/8*V0,1/6*V0

LCD Power Supply Pins

Pin Name

I/O

Function

No. of Pins

CAP1P

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1N

terminal.

CAP1N

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1P

terminal.

CAP2P

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP2N

terminal.

CAP2N

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP2P

terminal.

CAP3P

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1N

terminal.

CAP4P

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP2N

terminal.

CAP5P

DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1N

terminal.

VOUT

DC/DC voltage converter. Connect a capacitor between this terminal and VSS or

VDD

Output voltage regulator terminal. Provides the voltage between VSS and V0 through

a resistive voltage divider.

IRS = “L” : the V0 voltage regulator internal resistors are not used.

IRS = “H” : the V0 voltage regulator internal resistors are used.

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