ST7565 datasheet(21/56 Pages) SITRONIX

21 / 56 page

ST7565

Ver 1.0a

21/56

2002/06/24

Figure 7

* The VSS2 voltage range must be set so that the VOUT terminal voltage does not exceed the absolute maximum rated value.

The Voltage Regulator Circuit

The step-up voltage generated at VOUT outputs the LCD

driver voltage V5 through the voltage regulator circuit.

Because the ST7565 chips have an internal high-accuracy

fixed voltage power supply with a 64-level electronic volume

function and internal resistors for the V5 voltage regulator,

systems can be constructed without having to include

high-accuracy voltage regulator circuit components.

Moreover, in the ST7565, Two types of thermal gradients

have been prepared as VREG options: (1) approximately

-0.15%/°C (2) external input (supplied to the VRS terminal)

(A) When the V5 Voltage Regulator Internal Resistors Are Used

Through the use of the V5 voltage regulator internal resistors

and the electronic volume function the liquid crystal power

supply voltage V5 can be controlled by commands alone

(without adding any external resistors), making it possible to

adjust the liquid crystal display brightness. The V5 voltage

can be calculated using equation A-1 over the range where

| V5 | < | VOUT |.

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

2x step-up voltage circuit

VDD=0V

VSS2=-5V

VOUT=3xVSS2=-10V

2x step-up voltage relationships

OPEN

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

3x step-up voltage circuit

VDD=0V

VSS2=-3V

VOUT=3xVSS2=-9V

3x step-up voltage relationships

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

4x step-up voltage circuit

VDD=0V

VSS2=-3V

VOUT=4xVSS2=-12V

4x step-up voltage relationships

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