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參數(shù)資料
| 型號： | HE84G770B |
| 廠商： | King Billion Electronics Co., Ltd. |
| 英文描述： | 8-BIT MICRO-CONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 29/61頁 |
| 文件大?。?/td> | 817K |
| 代理商： | HE84G770B |
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10.
LCD Power Supply
King Billion Electronics Co., Ltd
駿
億
電
子
股
份
有
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公
司
HE84G770
HE80004H SERIES
October 31, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
29
Version:V1.1
The built-in LCD power supply is equipped with input voltage regulator, voltage multiplier and bias
voltage generating circuit with active buffer instead of passive resistor voltage dividing network. The
input voltage is regulated to LVREG using the internally generated LVAG as reference voltage. LVREG
can be adjusted by resistors between LGS1 and LVREG.
LVREG adjustment guideline
: First, the level of LVREG must be at least 0.4 volt lower than VDD at all
time, even at the end of battery life, for the regulator to function properly. For example, if the VDD is
expected to drop to 2.2 volts when battery is low, then the level of LVREG can only be set at 1.8 volts
max. With this constraint, it is advisable to set the level of LVREG as high as possible and use less charge
pump stages to save power. For example, to pump the 2 volts to 12 volts requires 6 charge pump stages;
to pump the 2.4 volts to 12 volts requires only 5 charge pump stages which consumes less power. So it is
recommended not to adjust the LVREG to an unnecessary low level.
Voltage charge pump:
The LVREG is then multiplied by 3, 4, 5, or 6 times, depending on external
capacitors configurations as shown below, to generate LVL5. Please note that LVL5 must be lower than
12 volts to prevent chip from break-down. The capacitance of capacitors connected to LVL1~5 shall be
increased in an appropriate amount based on the LCD panel size. For small size LCD panel, the 10uF
capacitors are enough, but 22uF capacitors may be necessary for large LCD size application.
VR12
VR12
VR12
VR12
GS1
GS1
GS1
GS1
VREG
VREG
VREG
LVL5
LVL4
LVL4
LVL4
LVL4
LVL3
LVL3
LVL3
LVL3
LVL2
LVL2
LVL2
LVL2
LVL1
LVL1
LVL1
LVL1
LCAP5A
LCAP5A
LCAP5A
LCAP4A
LCAP4A
LCAP4A
LCAP3A
LCAP3A
LCAP3A
LCAP2A
LCAP2A
LCAP2A
LCAP2A
LCAP1A
LCAP1A
LCAP1A
LCAP1A
LCAP4A
LCAP1B
LCAP2B
LCAP1B
LCAP3A
LCAP1B
LCAP1B
LVL5
LCAP2B
LVL5
LVL5
LCAP2B
LCAP5A
LCAP2B
VREG
1uF
1uF
1uF
10uF
260K
1uF
1uF
260K
1uF
260K
1uF
1uF
260K
1uF
1uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
1uF
1uF
1uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
1uF
1uF
1uF
1uF
1uF
1uF
1uF
1uF
1uF
x3 charge pump config.
x4 charge pump config.
x5 charge pump config.
x6 charge pump config.
The internal reference voltage has built-in temperature compensation to make up the reference voltage
deviation due to the temperature variation. Four temperature coefficients are available for selection by
mask option MO_TC. It’s used to compensate the LCD display feature in the range of room temperature
to low temperature. User shall set the MO_TC value based on the LCD feature and operation environment.
If the MO_TC is set to “11”, the LCD power voltage will have 0.33% decrease when the temperature
increases one degree.
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