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14. Dot Matrix LCD Controller (H8/3854 Group)
When Using External Power Supply and Built-In Bleeder Resistances
When an external power supply is supplied from V1OUT and the built-in bleeder resistances are
used, clear LPS1 to 0 and set LPS0 to 1 in control register 2 (LR1), and make the connections
shown in figure 14.13. The power supply applied to V1OUT must not exceed V
capacitance of the LCD panel to be driven is large, capacitors of around 0.1 to 0.5 μF should be
inserted between V1OUT to V5OUT and V
External
power supply
+
0.1 to 0.5 μF
V
SS
Notes: 1. When using 1/5 bias, do not short V3OUT and V4OUT.
≤ V1OUT ≤ V
2. Set V
SS
Figure 14.13 When Using External Power Supply and Built-In Bleeder Circuit (1/4 Bias)
Rev.3.00 Jul. 19, 2007 page 400 of 532
REJ09B0397-0300
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
+
+
+
V
SS
.
CC
to provide stabilization.
SS
V
CC
LPS1 = 0
LPS0 = 1
OFF
V1
ON
R
V2
ON
R
V3
Control
ON
circuit
R
V4
ON
R
V5
ON
R
V
SS
. If the
CC
SEG1 to SEG40
COM1 to COM16
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