14. Dot Matrix LCD Controller (H8/3854 Group)
Rev.3.00 Jul. 19, 2007 page 401 of 532
REJ09B0397-0300
When Using External Power Supply and Bleeder Resistances
If the drive capability of the built-in bleeder resistance is insufficient for the size of the LCD
panel, the V1 to V5 levels can be supplied from external bleeder resistances. In this case, clear the
LPS1 and LPS0 bits in control register 2 (LR1) to 0, and make the connections shown in figure
14.14.
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
V
CC
OFF
OFF
OFF
OFF
OFF
OFF
Rx
Rx
Rx
Rx
Rx
V1
V2
V3
V4
V5
LPS1 = 0
LPS0 = 0
Control
circuit
SEG1 to SEG40
COM1 to COM16
V
SS
V
SS
V
SS
External
power supply
Notes: 1. When using 1/4 bias, short V3OUT and V4OUT.
2.
Set
V
SS
≤
V
in
≤
V
CC
(V
in
: V1OUT to V5OUT).
3. A value of around 5 k
Ω
to 25 k
Ω
is recommended for external power supply division resistances Rx.
Figure 14.14 When Using External Power Supply and External Bleeder Circuit (1/5 Bias)
Summary of Contents for F-ZTAT H8 Series
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