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ML63611 User's Manual
Chapter 13 LCD Driver (LCD)
13.6
Bias Generator Circuit (BIAS)
The bias generator circuit (BIAS) for the LCD driver in the OPTION B and OPTION D generates the different
bias voltages, when external capacitors are connected, by multiplying the constant voltage output (V
of the voltage regulator circuit for the LCD.
Further, in the OPTION A and OPTION C, the bias generator circuit (BIAS) generates the different bias voltages,
when external capacitors are connected and the pin V
multiplying the power supply voltage V
(1) The configuration of the bias generator circuit of the OPTION B and OPTION D is shown in Figure 13-8.
C
3
C
2
C
1
C
12
Figure 13-8 Configuration of the Bias Generator Circuit of the OPTION B and OPTION D
!
Note:
When not using the LCD driver, the four capacitors C
V
, V
, C1, and C2 open.
DD2
DD3
Further, when using the LCD driver at 1/2 duty, the capacitor C
this case.
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
.
DD
(OPTION B: 1.5 V, OPTION D: 3.0 V)
V
DD
V
(2.85 V)
DD3
V
(1.9 V)
DD2
V
(0.95 V)
DD1
V
(0 V)
SS
C1
C2
ML63611
(C
, C
1
2
(V
for the OPTION A) is shorted to V
DD2
DD1
Bias
generator
circuit
(0.95 V)
V
DD3
V
DD2
V
DD1
Inside the IC
= 0.1 µ µ µ µ F)
, C
, C
3
12
, C
, C
, and C
1
2
3
12
is not necessary. Leave the pin V
2
13 – 12
OPTION B (D): 1.5 V (3.0 V), With regulator
V
DD
1 kHz
(from time base counter)
Voltage regulator
circuit for LCD
To LCD driver
are not necessary. Leave the pins V
circuit for LCD bias
= 0.95 V)
DD1
, by
DD
,
DD1
open in
DD2
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