14. Dot Matrix LCD Controller (H8/3854 Group)
Rev.3.00 Jul. 19, 2007 page 399 of 532
REJ09B0397-0300
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
CC
, or using an
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
μ
F should be
inserted between V1OUT to V5OUT and V
SS
to provide stabilization.
+
+
+
+
0.1 to 0.5
μ
F
+
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
V
CC
ON
ON
ON
ON
ON
ON
R
R
R
R
R
V1
V2
V3
V4
V5
LPS1 = 1
LPS0 = 1
Control
circuit
SEG1 to SEG40
COM1 to COM16
V
SS
V
SS
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
(1/5 Bias)
Summary of Contents for F-ZTAT H8 Series
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