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13. Dot Matrix LCD Controller (H8/3857 Group)
+
0.1 to 0.5 μF
Vci
+
0.47 to 1 μF
V
SS
Notes:
1.
Rt is a test resistance. The V3, V34, and V4 pins should be shorted.
2.
The output voltage after step-up should not be lower than V
not exceed 7.0 V.
3.
Vci is also used for the step-up circuit power supply. Use a transistor, etc.,
for current amplification to ensure an adequate LCD drive current.
4.
The Vci input level must not exceed V
5.
Care is required with connection when using capacitors with polarity.
Figure 13.17 Example of Connections when Using Built-In Step-Up Circuit (2)
Rev.3.00 Jul. 19, 2007 page 370 of 532
REJ09B0397-0300
V
LCD
V1OUT
V2OUT
V3
V3OUT
V34
V4
V4OUT
V5OUT
+
+
+
+
V
Vci
C1 +
C1
+
0.47 to 1 μF
C2 +
C2
VLOUT
(2X Step-Up, 1/4 Bias)
OPON = 1
V
R
V1
R
V2
R
V3
Rt
R
V4
R
V5
R
ON
SS
V
–
Step-up
circuit
–
.
CC
SEG1 to SEG40
Control
COM32/SEG41
circuit
to COM9/SEG64
COM1 to COM8
SS
PWR = 1
and should
CC
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