ST8012 datasheet(25/47 Pages) SITRONIX

25 / 47 page

ST8012

V1.6

25/47

2004/09/08

The Voltage Regulator Circuit

The step-up voltage generated at VOUT outputs the

LCD driver voltage V0 through the voltage regulator

circuit. Because the ST78012 chips have an internal

high-accuracy fixed voltage power supply with a

64-level electronic volume function and internal

resistors for the V0 voltage regulator, systems can be

constructed without having to include high-accuracy

voltage regulator circuit components.(VREG

thermal

gradients approximate -0.05%/°C)

(A) When the V0 Voltage Regulator Internal Resistors Are Used

Through the use of the V0 voltage regulator internal

resistors and the electronic volume function the liquid

crystal power supply voltage V0 can be controlled by

commands

alone

(without

adding

any

external

resistors), making it possible to adjust the liquid

crystal display brightness. The V0 voltage can be

calculated using equation A-1 over the range where

| V0 | < | VOUT|.

Figure 3

VEV

1 -

200

VREG

∵ VEV

1 -

200

VREG

Internal Rb

Internal Ra

EV constant voltage supply+electronic volume

VSS

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