參數(shù)資料
型號(hào)： EPL43102
英文描述： Graphic STN LCD Drivers with Built-in RAM
中文描述： 圖形STN液晶顯示器驅(qū)動(dòng)器，內(nèi)置內(nèi)存
文件頁(yè)數(shù)： 22/64頁(yè)
文件大?。?/td> 280K
代理商： EPL43102
43 COM / 102 SEG LCD DRIVER
The information in this document is subject to change without notice.
24
Voltage converter circuits
These circuits boost up the electric potential between VDD and VSS to 2, 3, 4, or 5 times
toward positive side and boosted voltage is outputted from VOUT pin. The boosting
magnitude of internal booster circuit is selected by the capacitor connection (Refer
Figure 15). The internal oscillator is required to be operating when using this converter,
because the divided signal provided from the oscillator is used for the internal timing of
this circuit.
Figure 15
Voltage regulator circuits
The voltage regulator determines the LCD driving voltage V0, by adjusting resistors, Ra
and Rb, within the range of |V0| < |VOUT|. Because VOUT is the operating voltage of
operational-amplifier circuits, it is necessary to be applied internally or externally. For the
Eq. 1, we determine V0 by Ra, Rb and VEV. The Ra and Rb are connected internally or
externally by IRS pin. And VEV called the voltage of electronic volume is determined by
Eq. 2, where the parameter
α is the value selected by instruction, "Set Contrast Control
Mode", within the range 0 to 63.
VREF, a constant voltage source is 2 V at TA=25
oC.
C1+
C1-
C3
C4
C2-
C2+
VOUT
OPEN
C1+
C1-
C3
C4
C2-
C2+
VOUT
OPEN
C1+
C1-
C3
C4
C2-
C2+
VOUT
C1+
C1-
C3
C4
C2-
C2+
VOUT
2X
3X
4X
5X
Boost Capacitors = 1 uF~4.7 uF
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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