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+
+
0.1 to 0.5 μF
Vci
+
0.47 to 1 μF
V
SS
Notes:
1.
Rt is a test resistance. The V3 and V34 pins should be shorted.
2.
The output voltage after step-up should not be lower than V
exceed 7.0 V. With 3X step-up, in particular, do not input a voltage of 2.3 V or
3.
above as the reference voltage (Vci).
Vci is also used for the step-up circuit power supply. Use a transistor, etc., for
4.
current amplification to ensure an adequate LCD drive current.
5.
The Vci input level must not exceed V
Care is required with connection when using capacitors with polarity.
Figure 13.17 Example of Connections when Using Built-In Step-Up Circuit (1)
V
LCD
V1OUT
V2OUT
V3
V3OUT
V34
V4
V4OUT
V5OUT
+
+
+
V
SS
Vci
C1 +
+
0.47 to 1 μF
C1
C2 +
+
0.47 to 1 μF
C2
VLOUT
(3X Step-Up, 1/5 Bias)
13. Dot Matrix LCD Controller (H8/3857 Group)
OPON = 1
V
R
V1
R
V2
R
V3
Rt
Control
R
V4
R
V5
R
ON
V
SS
PWR = 1
–
Step-up
circuit
–
CC
.
CC
Rev.3.00 Jul. 19, 2007 page 369 of 532
SEG1 to SEG40
COM32/SEG41
circuit
to COM9/SEG64
COM1 to COM8
and should not
REJ09B0397-0300
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