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HD6433846XXXH 参数 Datasheet PDF下载

HD6433846XXXH图片预览
型号: HD6433846XXXH
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器\n [Microcontroller ]
分类和应用: 微控制器外围集成电路时钟
文件页数/大小: 524 页 / 1465 K
品牌: ETC [ ETC ]
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2. Example of operation (with 1/3 bias drive)  
1. During charging period Tc in the figure, the potential is divided among pins V1, V2, and  
V3 by the built-in split-resistance (the potential of V2 being 2/3 that of V1, and that of V3  
being 1/3 that of V1), as shown in figure 13-14, and external capacitors C1, C2, and C3 are  
charged. The LCD panel is continues to be driven during this time.  
2. In the following discharging period, Tdc, charging is halted and the charge accumulated in  
each capacitor is discharged, driving the LCD panel.  
3. At this time, a slight voltage drop occurs due to the discharging; optimum values must be  
selected for the charging period and the capacitor capacitances to ensure that this does not  
affect the driving of the LCD panel.  
4. In this way, the capacitors connected to V1, V2, and V3 are repeatedly charged and  
discharged in the cycle shown in figure 13-14, maintaining the potentials and continuously  
driving the LCD panel.  
5. As can be seen from the above description, the capacitances and charging/discharging  
periods of the capacitors are determined by the current dissipation of the LCD panel used.  
The charging/discharging periods can be selected with bits CDS3 to CDS0.  
6. The actual capacitor capacitances and charging/discharging periods must be determined  
experimentally in accordance with the current dissipation requirements of the LCD panel.  
An optimum current value can be selected, in contrast to the case in which a direct current  
flows constantly in the built-in split-resistance.  
Charging  
period Tc  
Discharging  
period Tdc  
Voltage drop  
associated with  
discharging due  
to LCD panel  
driving  
Vd1  
Vd2  
V1 potential  
V2 potential  
V0  
V1  
V2  
V3  
V1×2/3  
V1×1/3  
C1  
C2  
V3 potential  
Vd3  
C3  
Power supply voltage fluctuation in 1/3 bias system  
Figure 13-14 Example of Low-Power-Consumption LCD Drive Operation  
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