14. Dot Matrix LCD Controller (H8/3854 Group)
Rev.3.00 Jul. 19, 2007 page 400 of 532
REJ09B0397-0300
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
CC
. 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
OFF
ON
ON
ON
ON
ON
R
R
R
R
R
V1
V2
V3
V4
V5
LPS1 = 0
LPS0 = 1
Control
circuit
SEG1 to SEG40
COM1 to COM16
V
SS
V
SS
V
SS
External
power supply
Notes: 1. When using 1/5 bias, do not short V3OUT and V4OUT.
2.
Set
V
SS
≤
V1OUT
≤
V
CC
.
Figure 14.13 When Using External Power Supply and Built-In Bleeder Circuit (1/4 Bias)
Summary of Contents for F-ZTAT H8 Series
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Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
Page 234: ...8 I O Ports Rev 3 00 Jul 19 2007 page 208 of 532 REJ09B0397 0300...
Page 274: ...9 Timers Rev 3 00 Jul 19 2007 page 248 of 532 REJ09B0397 0300...
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