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14.3.11 LCD Voltage Generation Circuit
When Using Internal Power Supply and Built-In Bleeder Resistances
The LCD controller includes bleeder resistances that generate levels V1 to V5. For the LCD drive
power supply, drive can be performed using the internal power supply and V
external supply. When the internal power supply is used, and the built-in bleeder resistances are
employed, bits LPS1 and LPS0 in control register 2 (LR1) should both be set to 1. If the
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
+
+
0.1 to 0.5 μF
V
SS
Note: When using 1/4 bias, short V3OUT and V4OUT.
Figure 14.12 When Using Internal Power Supply and Built-In Bleeder Resistances
to provide stabilization.
SS
ON
V1OUT
R
V2OUT
R
V3OUT
R
V4OUT
R
V5OUT
+
+
+
R
V
SS
(1/5 Bias)
14. Dot Matrix LCD Controller (H8/3854 Group)
V
CC
LPS1 = 1
LPS0 = 1
V1
ON
V2
ON
V3
Control
ON
circuit
V4
ON
V5
ON
V
SS
Rev.3.00 Jul. 19, 2007 page 399 of 532
, or using an
CC
SEG1 to SEG40
COM1 to COM16
REJ09B0397-0300
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