參數(shù)資料
型號(hào)： M38C89MF-XXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP144
封裝： 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
文件頁(yè)數(shù)： 26/55頁(yè)
文件大?。?/td> 981K
代理商： M38C89MF-XXXFP
31
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
Bias Control
In the LCD power source pins (VL1–VL5), 1/7 bias is automatically
generated in 32 duty ratio and 1/5 bias is done in 16 duty ratio as
well. Be sure to connect the capacitor for smoothness to these pins.
When requiring 1/5 bias in 32 duty ratio, use an external resistor to
generate a necessary level. In this case the drivability selection bit 1
of LCD control register 1 must be “1”.
Fig. 29 Example of circuit at each bias
Table 8 Bias control and applied voltage to VL1–VL5
Bias value
Voltage value
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
Note: VLCD is a value which can be supplied to the LCD panel. Set value
which is less than maximum ratings to VLCD.
1/5 bias
in 16 duty ratio
1/7 bias
in 32 duty ratio
At 1/5 bias
R1=R2=R3=R4=R5
At 1/7 bias
R1=R2=R4=R5
R3=3R1
VL5
VL4
VL3
VL2
VL1
C3
C2
C1
VLIN
R1
R2
VL5
VL4
VL3
VL2
VL1
R3
R4
R5
RT
C3
C2
C1
VLIN
VL5
VL4
VL3
VL2
VL1
RT
C3
C2
C1
VLIN
1/5, 1/7 bias
When using voltage multiplier
circuit
1/5, 1/7 bias
When not using voltage
multiplier circuit (1)
1/5, 1/7 bias
When not using voltage
multiplier circuit (2)
1.3 to
2.33 V
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 ap-
proximately three times as large as that of VLIN pin occurs at the VL5
pin. Operate the voltage multiplier after applying a reference voltage
for boosting to VLIN.
The voltage multiplier multiplies a VLIN voltage by charge/discharge
of capacitors between C1 and C2 pins and to C3 pin. Accordingly, if a
large LCD panel is driven or a vias value is changed owing to an
external resistor, a level from VL5 pin might be not a requested level.
To prevent this, we recommend use of an external power source
which can supply stabilized power.
Additionally, when using the voltage multiplier, set a higher resistor
value (the sum of R1 to R5) as possible (100 k
or more recom-
mended).
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