ST7632 datasheet(32/96 Pages) SITRONIX

32 / 96 page

ST7632

Ver 1.7

32/96

2006/08/15

7.10 Liquid Crystal Driver Power Circuit

The Power Supply circuits generate the voltage levels necessary to drive liquid crystal driver circuits with low power

consumption and the fewest components. There are voltage converter circuits, voltage regulator circuits, and voltage

follower circuits. They are controlled by power control instruction. For details, refers to "Instruction Description". Table

7.10.1 shows the referenced combinations in using Power Supply circuits.

Table 7.10.1 Recommended Power Supply Combinations

User setup

Power

control

(VC VR VF)

V/C

circuits

V/R

circuits

V/F

circuits

VOUT

V1 to V4

Only the internal power

supply circuits are used

1 1 1

Open

Only the voltage

regulator circuits and

voltage follower circuits

are used

0 1 1

OFF

External

input

Open

Only the voltage follower

circuits are used

0 0 1

OFF

Open

External

input

Open

Only the external power

supply circuits are used

0 0 0

OFF

Open

External

input

External

input

7.10.1 Voltage Converter Circuits

These circuits boost up the electric potential between VDD2 and Vss to 2, 3, 4, 5, 6, 7 or 8 times toward positive side and

booster voltage is outputted from VOUOUT pin. It is possible to select the lower boosting level in any boosting circuit by

“ANASET” instruction.

7.10.2 Voltage Regulator Circuits

SET VOP (SETVOP)

The set VOP function is used to program the optimum LCD supply voltage V0.

SETVOP

For example when Vop[8:0] is 257DEC = 13.88V.

The VOP value is programmed via the Vop[8:0] register.

V0=a+( Vop[8:6]Vop[5:0])．b

Ex:Vop[5:0]=000001, Vop[8:6]=100

→ Vop [8:0]=100000001

→ 3.6+257x0.04=13.88

a is a fixed constant value (see table 7.10.2).

b is a fixed constant value (see table 7.10.2).

Vop[8:0] is the programmed VOP value. The programming range for Vop[8:0] is 4 to 410 (05 to 19A hex).

VOP[5:0] is the set contrast value which can be set via the interface and is in two

’s complement format.(See

command VOLUP & VOLDOWN)

ST7632 Datasheet(PDF) 32 Page - Sitronix Technology Co., Ltd.

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