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參數(shù)資料
| 型號： | M3826AMFA-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 41/93頁 |
| 文件大?。?/td> | 996K |
| 代理商： | M3826AMFA-XXXGP |
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Rev.2.00
May. 24, 2006
page 46 of 90
REJ03B0028-0200
3826 Group (A version)
Voltage Multiplier (3 Times)
The voltage multiplier performs threefold boosting. This circuit in-
puts a reference voltage for boosting from LCD power input pin
VL1.
Set each bit of the segment output enable register and the LCD
mode register in the following order for operating the voltage mul-
tiplier.
1. Set the segment output enable bits (bits 0 to 5) of the seg-
ment output enable register to “0” or “1”.
2. Set the duty ratio selection bits (bits 0 and 1), the bias con-
trol bit (bit 2), the LCD circuit divider division ratio selection
bits (bits 5 and 6), and the LCDCK count source selection
bit (bit 7) of the LCD mode register to “0” or “1”.
3. Set the LCD output enable bit (bit 6) of the segment output
enable register to “1” (enabled). Apply the limit voltage or
less to the VL1 pin.
4. Set the voltage multiplier control bit (bit 4) of the LCD mode
register to “1” (voltage multiplier enabled). However, be sure
to select 1/3 bias for bias control.
When voltage is input to the VL1 pin during operating the voltage
multiplier, voltage that is twice as large as VL1 occurs at the VL2
pin, and voltage that is three times as large as VL1 occurs at the
VL3 pin.
■Notes on Voltage Multiplier
When using the voltage multiplier, apply the limit voltage or less to
the VL1 pin, then set the voltage multiplier control bit to “1” (en-
abled).
When not using the voltage multiplier, set the LCD output enable
bit to “1”, then apply proper voltage to the LCD power input pins
(VL1–VL3). When the LCD output enable bit is set to “0” (disabled)
(during reset is included), the VL3 pin is connected to VCC inside
of this microcomputer. When the voltage exceeding VCC is applied
to VL3, apply VL3 voltage after setting the LCD output enable bit to
“1” (enabled).
Fig. 48 Example of circuit at each bias
Table 10 Bias control and applied voltage to VL1–VL3
Bias value
1/3 bias
1/2 bias
Voltage value
VL3=VLCD
VL2=2/3 VLCD
VL1=1/3 VLCD
VL3=VLCD
VL2=VL1=1/2 VLCD
Note : VLCD is the maximum value of supplied voltage for the
LCD panel.
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (VL1–VL3), apply the voltage shown
in Table 10 according to the bias value.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
R4
R5
R4 = R5
1/2 bias
R1
R2
R3
VCC
VL3
VL2
C2
C1
VL1
R1 = R2 = R3
VCC
VL3
VL2
C2
C1
VL1
VL3
VL2
C2
C1
VL1
Open
Contrast control
Open
Contrast control
1/3 bias
when not using the voltage
multiplier
1/3 bias
when using the voltage
multiplier
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