ST8009 Просмотр технического описания (PDF) - Sitronix Technology Co., Ltd.
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ST8009 Datasheet PDF : 43 Pages
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ST8009
Electronic Volume Register Set
D7 D6 D5 D4 D3 D2 D1 D0
1 1 E5 E4 E3 E2 E1 E0
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.
E5 E4 E3 E2 E1 E0 Ra/Rb Ratio
000000
Small
000001
000010
111101
111110
111111
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:
1. Interface control selection
FR: 0
LR: 0
PS: 1
2. LCD Duty selection
The segment mode (96 segments) is selected by
default.
3. LCD Bias Set
1/4 bias is selected by default.
4. Power Controller Set
All the power circuits (booster, regulator and
follower) will be turned off by default.
5. Booster Frequency Set
Volume is 1 0 0 by default
6. V0 Voltage Regulator Internal Resistor Ratio Set
Volume is 1 0 0 by default
7. Electronic Volume Register Set
Volume is 1 0 0 0 0 0 by default
V1.1
30/43
2006/11/1
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