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