ST8009 datasheet(30/43 Pages) SITRONIX

30 / 43 page

ST8009

V1.1

30/43

2006/11/1

Electronic Volume Register Set

This register can control the V0 in 64 steps of voltage

level to adjust the brightness of the liquid crystal display.

This register had better set under 0xE0. Because when

the value of this register set over 0xE0, the V0 will be

inaccuracy. The inaccurate value of V0 will exceed in

±0.1V when this register set over 0xE0. By this limit, if

we need a higher voltage for V0, we had better set the

bigger value for “V0 Voltage Regulator Internal Resistor

Ratio” register, and then adjust the value of “Electronic

Volume” register to produce the proper voltage for V0

terminal.

Ra/Rb Ratio

Small

Large

Initializing by internal Reset circuit

An internal reset circuit initializes the ST8009 after

software reset has set. Following are the initial value of

command registers after software reset:

Interface control selection

FR: 0

LR: 0

PS: 1

LCD Duty selection

The segment mode (96 segments) is selected by

default.

LCD Bias Set

1/4 bias is selected by default.

Power Controller Set

All the power circuits (booster, regulator and

follower) will be turned off by default.

Booster Frequency Set

Volume is 1 0 0 by default

V0 Voltage Regulator Internal Resistor Ratio Set

Volume is 1 0 0 by default

Electronic Volume Register Set

Volume is 1 0 0 0 0 0 by default

ST8009 Datasheet(PDF) 30 Page - Sitronix Technology Co., Ltd.