M38C88EA-XXXFP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M38C88EA-XXXFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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MITSUBISHI MICROCOMPUTERS

38C8 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Voltage Multiplier

When the voltage multiplier is operated after a reference voltage for

boosting is applied to LCD power supply VLIN, a voltage that is three

times as large as VLIN pin occurs at the VL5 pin. Operate the voltage

multiplier after applying a reference voltage for boosting to VLIN.

Bias Control

In the LCD power source pins (VL1–VL5), a proper level is automati-

cally generated in 1/32 and 1/16 duty ratio. The quality of the LCD

display can be stabilized by connecting the capacitor for smooth-

ness between Vss and these pins.

Table 8 Bias control and applied voltage to VL1–VL5

Bias value

1/7 bias

1/5 bias

VL5 = VLCD

VL4 = 6/7 VLCD

VL3 = 5/7 VLCD

VL2 = 2/7 VLCD

VL1 = 1/7 VLCD

VL5 = VLCD

VL4 = 4/5 VLCD

VL3 = 3/5 VLCD

VL2 = 2/5 VLCD

VL1 = 1/5 VLCD

Voltage value

Note: VLCD is a value which can be supplied to the LCD panel. Set value

which is less than maximum ratings to VLCD.

VL5

VL4

VL3

VL2

VL1

C3

C2

C1

VLIN

1.3 to

2.33 V

1/5, 1/7 bias

When using voltage multiplier

circuit

Fig. 29 Example of circuit at each bias

RT

VL5

VL4

VL3

VL2

VL1

C3

C2

C1

VLIN

1/5, 1/7 bias

When not using voltage

multiplier circuit (1)

RT

VL5

R1

VL4

R2

VL3

R3

VL2

R4

VL1

R5

C3

C2

C1

•At 1/5 bias

VLIN

R1=R2=R3=R4=R5

•At 1/7 bias

R1=R2=R4=R5

R3=3•R1

1/5, 1/7 bias

When not using voltage

multiplier circuit (2)

31

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