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When Using External Power Supply but Not Using Built-In Op-Amps
When the built-in step-up circuit and op-amps are not used, and the LCD drive voltages are
supplied directly from an external power supply, connections should be made as shown in figure
13.16.
As the built-in step-up circuit and op-amps are not used, the OPON bit in control register 2 (LR1)
should be cleared to 0.
V1
V2
V3
V4
V5
V
CC
V
SS
Notes: 1.
Rt is a test resistance. The V3 and V34 pins should be shorted.
2.
Set V
CC
Figure 13.16 Example of Connections when Not Using Built-In Op-Amps and Using
V
LCD
V1OUT
V2OUT
V3
V3OUT
V34
V4
V4OUT
V5OUT
V
SS
Vci
C1 +
C1
–
C2 +
C2
–
VLOUT
≤ V
= V1 ≤ 7.0 V, and V
LCD
External LCD Power Supply (1/5 Bias)
13. Dot Matrix LCD Controller (H8/3857 Group)
OPON = 0
V
R
V1
R
V2
R
V3
Rt
Control
circuit
R
V4
R
V5
R
OFF
V
SS
PWR = 0
Step-up
circuit
≥ V
≥ V
(n = 2, 3, 4, or 5).
LCD
n
SS
Rev.3.00 Jul. 19, 2007 page 367 of 532
SEG1 to SEG40
COM32/SEG41
to COM9/SEG64
COM1 to COM8
REJ09B0397-0300
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