HE84770D Datasheet, PDF (13/29 Pages) King blillion Electronics Co.,Ltd. – 8-bit Micro-controller

King Billion Electronics Co., Ltd
駿億電子股份有限公司
HE84770D
HE80000 SERIES
pump the 2.25 volts to 9 volts requires 4 times multiplier; to pump the 3 volts to 9 volts requires only 3
time multiplier which consumes less power. So it is advisable not to adjust the LVREG to an unnecessary
low level.
Voltage multiplication: The LVREG is then multiplied by 3, 4, or 5 times, depending on external
capacitors configurations as shown below, to generate LVP. Please note that LVP must be lower than 9
volts to prevent chip from breaking down.
x3 multiplier
4.7uF
0.1uF
0.1uF
4.7uF
10uF
4.7uF
0.1uF
0.1uF
0.1uF
0.1uF
LVL1
LVL2
LVL3
LVL4
LVL5
LGS2
R
LVP
LCAP4A
LCAP2B
LCAP2A
LCAP1A
LCAP1B
LCAP3A
LVREG
LGS1
R
LVAG
x4 multiplier
4.7uF
0.1uF
0.1uF
4.7uF
10uF
4.7uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
LVL1
LVL2
LVL3
LVL4
LVL5
LGS2
R
LVP
LCAP4A
LCAP2B
LCAP2A
LCAP1A
LCAP1B
LCAP3A
LVREG
LGS1
R
LVAG
x5 multiplier
4.7uF
0.1uF
0.1uF
4.7uF
10uF
4.7uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
LVL1
LVL2
LVL3
LVL4
LVL5
LGS2
R
LVP
LCAP4A
LCAP2B
LCAP2A
LCAP1A
LCAP1B
LCAP3A
LVREG
LGS1
R
LVAG
The LVP is then regulated to generated LVL1 ~ LVL5. LVL5 can be adjusted by the resistor between
LGS2 and LV5. Be sure to leave at least 0.3 volt between LVP and LV5 for the regulator circuit to
function properly. The formula is:
LVL5 = (1 + R2/80K) x 0.9V
Different duties require different bias settings. There is some theoretical correspondence between the
Duty and Bias Setting. However, it is better to use it as starting point and adjust it with real LCD panel
connected to it to determine the final setting. The theoretic relationship between the duty and bias setting
as following:
Duty Cycle Normal Bias Alternative Bias
32 duty
1/7
1/7.5
48 duty
1/8
1/7.5, 1/8.5
64 duty
1/9
1/8.5, 1/9.5
80 duty
1/10
1/9.5, 1/10.5
The bias setting is made by mask option MO_LBSR[2..0].
MO_LBSR[2..0] Bias Setting
August 7, 2006
Page 13 of 29
V1.2
This specification is subject to change without notice. Please contact sales person for the latest version before use.