Chapter 17
LCD
Operation XVII - 23
<3> In the case of generating the drive voltage with BSTVOL
(The reference voltage is generated with REFVOL.)
REFVOL output the reference voltage between 0.9 V and 1.8 V, and BSTVOL generate 2, 3 times higher voltage
of the reference voltage.
Table:17.3.4. shows the output voltage from VLC1/VLC2/VLC3. Connect the capacitor of 0.22 µF at VLC1-
VSS, VLC2-VSS and VLC3-VSS.
Table:17.3.4 Voltage level of VLC1/VLC2/VLC3 when BSTVOL/REFVOL are used.
Figure:17.3.3 Connection example of LCD power supply (when BSTVOL/REFVOL are used)
..
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)
..
Pin Name Voltage Level
2, 3 times boost
1/3-bias
VLC1 V
LC1
3 × V
LC3
is output.
VLC2 V
LC2
2 × V
LC3
is output.
VLC3 V
LC3
The reference voltage (0.9 V to 1.8 V) is output.
1/3 to 1/8duty 1/3bias
V
DD30 inpu
VLC1
VLC2
VLC3
VSS
C1
C2
VDD30
C
C
C
C
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