
15-6
ML63326 User's Manual
Chapter 15 LCD Driver (LCD)
Figure 15-2 Bias Generator Configuration for 1/5 Bias
15.5 Bias Generator (BIAS)
The bias generator is used to multiply and divide the voltage (V
DD2
) generated in the constant
voltage circuit with an external capacitor connected to pins C1, C2 to generate V
DD1
to V
DD5
bias voltages for the LCD driver.
The LCD power down mode stops the voltage lowering/raising operation of the bias
generation circuit in order to reduce supply current.
Figure 15-2 shows the bias generator configuration for 1/5 bias, and Figure 15-3 shows the
configuration for 1/4 bias.
For details of the voltage doubler circuit and the constant-voltage circuit, see Chapter 17,
"Power Supply Circuit."
Tables 15-2 and 15-3 list the display contrast adjusting voltages.
Voltage
doubler
circuit
Display contrast adjustment
(CN3–0)
1/5 bias select
(BISEL = "0")
To LCD driver
Constant voltage
circuit
BIAS
generator
V
DDH
CB1
CB2
V
DD5
V
DD4
V
DD3
V
DD2
V
DD1
V
SS
C1
V
SS
C2
C
12
C
a
C
b
C
c
C
d
C
e
C
b12
Power down mode select
(PDWN = "1")
V
DDL
C
l
C
h
V
DD
To high-speed clock generator circuit
Содержание ML63326
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Страница 256: ...Chapter 17 17 Power Supply Circuit POWER ...
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