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Chapter 17
LCD
<2> In the case of generating the drive voltage with BSTVOL
(The reference voltage is supplied from outside of the LSI.)
When BSTVOL is used with the input reference voltage from outside of the LSI, the LCD drive voltage described
in Figure:17.3.3 is generated. Connect the capacitor of 0.22 µF at VLC1-VSS, VLC2-VSS and VLC3-VSS.
Table:17.3.3 Voltage Level of VLC1/VLC2/VLC3 when BSTVOL is used
Pin Name
When the brightness of LCD panel is not enough, increase the frequency of LCUPCK with
the LCDMD0.LCUPCKDIV2-0 and LCDMD0.LCUPCKS2-0 or generate LCD drive voltage
outside the LSI. (Refer to <1> In the case of generating the drive voltage outside the LSI)
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XVII - 22
Operation
Voltage Level
VLC1
V
LC1
VLC2
V
LC2
VLC3
V
LC3
2 times boost
Static, 1/2-bias
2 × V
is output.
LC2
Supply the reference
voltage (V
= V
).
LC2
LC3
2, 3 times boost
1/3-bias
3 × V
is output.
LC3
2 × V
is output.
LC3
Supply the reference
voltage.
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