參數(shù)資料
型號： HD66410
廠商： Hitachi,Ltd.
英文描述： RAM-Provided 128-Channel Driver for Dot-Matrix Graphic LCD(點陣圖形LCD128通道驅(qū)動器)
中文描述： 內(nèi)存提供128通道驅(qū)動點陣圖形LCD（點陣圖形LCD128通道驅(qū)動器）
文件頁數(shù)： 31/50頁
文件大?。?/td> 177K
代理商： HD66410
HD66410
31
Power Supply Circuits
The HD66410 incorporates a double to quadruple booster to supply power to LCD drivers. The booster is
automatically turned off during standby mode, dissipating no power. If the current capacity provided is
insufficient for the user system, external power supply circuits are necessary. In this case, the internal
power supply can be turned off by register settings. Figure 23 shows examples of power supply circuits for
different boosting ratios.
Booster:
The internal booster raises the input voltage between V
CC
and GND two to four times every raster
by turning on the internal power supply with capacitors attached between C1+ and C1–, C2+ and C2–, C3+
and C3–, and to V
EE
. The booster uses the system clock, and thus the internal oscillator must be operating
to activate the booster (if the internal oscillator has been selected to generate the system clock). V
EE
outputs
V
CC
level when the booster is inactive.
C3
C0
C1+
C1–
C2+
C2–
C3+
C3–
C0
C0
GND
Vci
V
CC
V
EE
C1
Rb
V
CC
R
V1
R
V2
2.7R
V3
R
V4
R
R
a
R
th
V5
C3
C0
C1+
C1–
C2+
C2–
C3+
C3–
C0
GND
Vci
V
CC
V
EE
C1
C3
C1+
C1–
C2+
C2–
C3+
C3–
C0
GND
Vci
V
CC
V
EE
C1
C0
≥
1.0
μ
F
C1
≥
2.2
μ
F
a) Quadruple boosting
C2–, C3+: open
b) Triple boosting
C1–, C2+, C2–, C3+: open
c) Double boosting
Thermistor
Adjust the power supply voltage and capacitance of external capacitors according to the
characteristics of the LCD used because the output voltage (V
EE
) drop depends on the load current,
operation temperature, operation frequency, capacitance of external capacitors, and manufacturing
tolerance. Refer to the Electrical Characteristics section for details.
Adjust the power supply voltage so that the output voltage (V
EE
) after boosting will not exceed the
absolute maximum rating of the LCD power supply voltage (13V).
Vci is both a reference voltage and power supply for the booster; it needs to be supplied with at least
three times the current consumed by the LCD drivers including the current flowing in the resistive
divider. Make sure that Vci is below V
CC
.
V
EE
terminal will be in high impedance state when DC/DC converter stops working. In this case V
EE
level is pulled up to V
CC
level with external resistors and the voltage supplied to the capacitor C1 is
reserved. Do not use polarized capacitor to C1.
Notes: 1.
2.
3.
4.
Figure 23 Power Supply Circuit Examples
相關(guān)PDF資料
PDF描述
HD66420 (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66420TA0 LCD Display Driver
HD66421 (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66421TB0 (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66503 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時電路的240通道驅(qū)動器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66420 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66420TA0 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:LCD Display Driver
HD66421 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66421TB0 制造商:Renesas Electronics Corporation 功能描述:
HD66503 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
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