Chapter 17
LCD
Operation XVII - 19
17.3.4 LCD Drive Voltage Selection
LCD drive voltage can be generated with one of the three method described in Table:17.3.1.
Table:17.3.1
LCD Drive Voltage Supply Method
..
The supply voltage to VLC1 (V
LC1
) must be kept between V
DD30
and 3.6 V.
(V
DD30
≤ V
LC1
≤ 3.6 V).
..
Method of generating LCD drive voltage Description
1
Generate the drive voltage
outside the LSI
Supply the voltage generated outside of the LSI to VLC1, VLC2
and VLC3.
2
Generate the drive voltage
with BSTVOL
(The reference voltage is supplied
from outside of the LSI.)
<2 or 3 times boosting>
Supply the reference voltage (V
LC3
) to VLC3.
2 times higher voltage of V
LC3
is output from VLC2.
3 times higher voltage of V
LC3
is output from VLC1.
<1/2 or 3/2 times boosting (1/3 bias)>
Supply the reference voltage (V
LC2
) to VLC2.
1/2 times lower voltage of V
LC2
is output from VLC3.
3/2 times higher voltage of V
LC2
is output from VLC1.
<2 times boosting (1/2 bias)>
Supply the reference voltage (V
LC2
) to VLC2 and VLC3.
2 times higher voltage of V
LC2
is output from VLC1.
3
Generate the drive voltage
with BSTVOL
(The reference voltage is generated
with REFVOL.)
No need to supply voltage from outside of the LSI.
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