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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.
V
SS
Notes: 1. When using 1/4 bias, short V3OUT and V4OUT.
≤ V
2. Set V
SS
in
3. A value of around 5 kΩ to 25 kΩ is recommended for external power supply division resistances Rx.
Figure 14.14 When Using External Power Supply and External Bleeder Circuit (1/5 Bias)
External
power supply
V1OUT
Rx
V2OUT
Rx
V3OUT
Rx
V4OUT
Rx
V5OUT
Rx
V
SS
≤ V
(V
: V1OUT to V5OUT).
CC
in
14. Dot Matrix LCD Controller (H8/3854 Group)
V
CC
LPS1 = 0
LPS0 = 0
OFF
V1
OFF
V2
OFF
V3
Control
OFF
circuit
V4
OFF
V5
OFF
V
SS
Rev.3.00 Jul. 19, 2007 page 401 of 532
SEG1 to SEG40
COM1 to COM16
REJ09B0397-0300
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